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Dissertations / Theses on the topic 'Passive Q-switched'

Author: Grafiati
Published: 4 June 2025
Last updated: 1 August 2025

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1

Phelps, Charles Dustin. "Diode-Pumped, 2-Micron, Q-Switched Tm:YAG Microchip Laser." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1304695817.

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2

Segura, Sarmiento Martha Yamile. "Monoclinic tm:klu(w04)2: a new crystal for efficient diode-pumped continuous-wave and q-switched lasers." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/80852.

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El doble tungstato cristalino de potasio y lutecio con estructura monoclínica, KLu(WO4)2, se ha establecido como una nueva matriz laser de estado sólido para iones de Tm, Yb y Ho debido a (i) las altas secciones eficaces de absorción y emisión; (ii) la relativamente larga distancia entre iones Lu-Lu permitiendo altos niveles de concentración de iones activos sin perdidas significativas por fluorescencia; y (iii) el tiempo de vida suficientemente largo del nivel emisor de la transición láser asegurando un alto almacenamiento de energía. Estas características son explotadas en este trabajo usan
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3

Lu, Min. "Performance of continuously pumped, passively Q-switched, solid state lasers." Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6953/.

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This thesis studies the relationship between the pairs of resonator output coupling and intra-cavity absorber initial transmission, and the FWHM (full width at half maximum) pulse duration of a continuously pumped passively Q-switched solidstate laser, when the output energy is pre-determined. Depending on the magnitude of the pumping power, three different rate equation models are used to evaluate the required output coupler reflectivity and absorber initial-transmission pair for the corresponding FWHM pulse duration. The energy transfer kinetics of the passively Q-switched laser decides the
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4

Serres, Serres Josep Maria. "Continuous-wave and passively Q-switched solid-state microchip lasers in the near-infrared." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/460758.

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Aquest treball tracta de la caracterització de làsers compactes d'estat sòlid, amb un primer enfocament, l'estudi del concepte microxip aplicat al làser en diversos hostes cristal·lins dopats amb terres rares. Es reporta els resultats sobre l'estudi de l'efecte de thermal lens, necessari per a l'obtenció de làser amb aquesta configuració, així com pel funcionament làser amb continu i polsat utilitzant la tècnica Q-switch. En els experiments, el concepte microxip es defineix com una cavitat làser quasi monolítica. Aquest concepte s'estudia per a diferents emissions de làser a ~1.06 m d'ion
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5

Mercer, Colin. "Development of a Diode Laser Pumped Passively Q-Switched Laser Source for Range-Finding and Designating." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508559.

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6

El, bassri Farid. "Sources lasers déclenchées nanosecondes : Applications à la spectroscopie Raman cohérente sous champ électrique." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0060/document.

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Du fait de leur compacité, leur robustesse et leur faible coût, les microlasers impulsionnels nanosecondes constituent des sources particulièrement attractives pour de nombreux systèmes de détection et d'analyse, en particulier les cytomètres en flux ou les dispositifs pour la spectroscopie CARS (Coherent Raman Anti Stokes Scattering). Cependant, ces applications nécessitent des performances améliorées en ce qui concerne la gigue temporelle et la cadence de répétition accessible. Dans sa première partie, cette thèse propose des solutions originales pour atteindre les performances requises à pa
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7

Lavastre, Eric. "Déclenchement des microlasers solides émettant à 1,55 µm par un dispositif à semiconducteur." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10173.

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Les microlasers emettant a 1,55 m sont des lasers solides de faible volume (<1 mm#3) a base de verre : er, yb dont les miroirs de la cavite sont directement deposes sur le milieu a gain. En introduisant un modulateur dans la cavite, il est possible de declencher le laser afin d'obtenir des impulsions de puissance crete elevee donc exploitables pour des applications telles que la telemetrie. L'objet de cette these est d'utiliser un dispositif a semiconducteur comme modulateur. De par leurs proprietes optiques et electriques, les semiconducteurs presentent un fort potentiel pour le declenchement
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8

Kun-GueiHong and 洪崑貴. "Dynamic behavior in the passive Q-switched Nd:YVO4 laser on pumping modulation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68080196281387953459.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>100<br>n this thesis, we study that the nonlinear dynamical behavior in passively Q-switched Nd:YVO4 laser. With increasing the modulation frequency of pumping source, the behavior of the pulse train in sequence will occur: period two, period three, period one and finally chaotic dynamics phenomena with some path of development. At the same time when the modulation frequency was closed to the pulse repetition frequency, the timing jitter of pulse train became very stable, and the pulse width compared with pulse train without modulation was compressed. In simulation
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9

Chen, Se-Jie, and 陳世杰. "Study of Passive and Active Q-Switched Intracavity Frequency-Doubled Solid State Laser." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/64496007136987231739.

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碩士<br>義守大學<br>電機工程學系<br>92<br>We have finished the theoretical analysis of active/passive Q-switched intracavity frequency doubled solid state laser without any sponsor or experimental equipments. With the analysis of plane E-M wave, the results of our model show that for a small compact laser cavity operating in TEM00 mode with single frequency output, the laser output energy and peak power will be greatly affected by both the ETU effect [15] caused by high pumping power and different ratio of pumping mode to laser mode. We also incorporate the pulse repetition frequenc
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10

Su, Huan-Rui, and 蘇桓銳. "Q-switched mode locking of Nd:YAG lasers by hybrid active and passive mechanisms." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33598935719840420612.

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碩士<br>東海大學<br>物理學系<br>99<br>This thesis studies Q-switched mode locking of Nd:YAG lasers by using active mode-locked technique in combination of gain switched or passive Q-switched technique. In the gain-switched experiment, Q-switched mode-locked pulses were observed when the modulation frequency tuned to resonate with natural frequency of the laser system. A four to five times enhancement of peak power and an improvement of mode-locked performance can be obtained by applying active mode locking to the gain-switched experiment. In passive Q-switched experiment, we have also observed Q-switche
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11

Tu, King-Chao, and 杜金潮. "Chaos in a Passive Q-Switched Nd：YAG Laser with a Cr4+：YAG Saturable Absorber." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/35974082860855292093.

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碩士<br>逢甲大學<br>光電物理研究所<br>91<br>The character of a passive Q-switched Nd:YAG laser system with a Cr4+:YAG saturable absorber is studied. The pulse has 1.8 kW peak power and 20 ns duration with a repetition rate of 5 kHz as the pump power being 2.8 W. When we increase the pump power, the period doubling route to chaos is found. A general period doubling route begins from period 1, but we had observed the period doubling route beginning from period 3. Besides, period 5 was also obtained in the experiments.
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12

Chou, Hsin-Yao, and 周妡遙. "Multi-wavelength passive Q-switched Er-doped fiber laser with a semiconductor saturable absorber." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/mc439b.

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碩士<br>國立交通大學<br>光電工程研究所<br>106<br>In this thesis study, we build a passive Q-switched E-doped fiber laser with a semiconductor saturable absorber. The laser constitutes of 2.89 m SMF-28, 0.7 m Er-doped fiber, and 2 m high nonlinearity fiber. By adjusting the two polarization controllers inside the cavity as well as the 980 nm laser diode pump power, we can let laser operate under two different Q-switched states: single-wavelength state and multi-wavelength state. We have experimentally investigated the lasing characteristics of the multi-wavelength Q-switched state and find an interesting ener
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13

Ching-YuWeng and 翁經宇. "Passive self-balanced Q-and gain-switched erbium all-fiber laser at S and L bands." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67600113246427107592.

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14

Chen, Chien-Hwo, and 陳建豪. "Period-Doubling Route to Chaos in a Passive Q-Switched Nd：YAG Laser with a Cr4+：YAG Saturable Absorber." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/43719068783351786735.

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碩士<br>逢甲大學<br>光電物理研究所<br>92<br>We study the nonlinear dynamic behavior in a passive Q-switched Nd:YAG laser system with a Cr4+:YAG saturable absorber. By operating in transverse-mode-degeneracy cavity, we find the doubling-route to chaos near the threshold. We find that the bifurcation accompanies with the low order of the transverse mode by analyzing the mode pattern variation. Therefore, we can confirm our mechanism should belong to multi-transverse mode competition, and the mechanism is different from the previous study. Besides, we also find the period-doubling route to chaos beginning
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15

He, Sheng-Ting, and 何昇庭. "Exploring Tail Removal of Passive Q-switched Pulse Nd:YAG Laser by Using Diffraction Intra-cavity Round Trip Loss." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/82621108341429678324.

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碩士<br>國立交通大學<br>理學院應用科技學程<br>105<br>The technique of pulsed pumping millijoule laser is well-developed in ophthalmology field and the related application. In this thesis, we utilize flash-pumped source to excite the Nd:YAG crystal and insert Cr4+:YAG to be the satuable absorber as forming the Q-switched operation. The cavity is set by a plano-convex mirror and concave-convex mirror, which is an unstable cavity with 90-mm-long cavity length. We measure the total output energy, laser-induced air breakdown threshold energy and laser output signal in time domain by exploiting different combination
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16

Tu, Jhih-he, and 塗智合. "Chaotic dynamics in passive Q-switched optical vortices laser formed by coherent superposition of off-axis multiple-pass geometric mode in azimuthal symmetry breaking optical resonator." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/vdjpw7.

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碩士<br>國立中山大學<br>光電工程學系研究所<br>106<br>Optical vortex (OV) beam carries orbital angular momentum (OAM) in the photons within. It is useful in a wide range of applications, particularly in high capacity OAM multiplexing communications and vortex laser machining. Therefore many researchers are dedicated to laser engineering for direct optical vortex laser emission which is more desirable because of well controlled beam quality and the conveniences for practical use. Our group successfully demonstrated stable OV laser of superior high vortex purity in continuous wave (CW) regime by the superposition
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17

Tsai, LingYi, and 蔡玲意. "Passively Q-switched intracavity optical parametric oscillator." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/85773595800845068740.

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碩士<br>國立交通大學<br>電子物理系所<br>93<br>Extremely short (1.6 ns) high-peak-power (> 10 kW) pulses of lasers at the eye-safe wavelength region about 1.5 �慆 are obtained by intracavity optical parametric oscillators (OPOs). We demonstrated a compact efficient eye-safe OPO pumped by a diode-pumped passively Q-switched Nd:GdVO4 laser to produce peak powers at 1571 nm higher than 20 kW with pulse widths of 0.7ns . On the other hand, we overcome the instablility in the IOPO by using two-mirror structure .At the same time, we raise the pulse energy to 1.5 times. Due to its stability, we try to apply the two-
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18

Huang, Wen-Cheng, and 黃文政. "The study of passively Q-switched fiber lasers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/98537971233131679287.

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博士<br>國立交通大學<br>電子物理系所<br>102<br>The double-cladding Yb-doped fiber as the gain medium and the passively Q-switching technique have been utilized in study of high power and high-repetition rate fiber lasers. First we use the double-cladding fiber with core diameter of 30 μm, and the AlGaInAs semiconductor material and the Cr4+:YAG crystal are used as the saturable absorbers (SA) respectively. By using the AlGaInAs as the SA, pulse energy up to 0.45 mJ with the repetition rate of 30 kHz in the pump power of 24 W can be attained. With the Cr4+:YAG crystal as the SA, we can have the laser output
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19

Tsai, Ming-Chen, and 蔡明辰. "Investigation of orthogonally-polarized passively Q-switched lasers." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4fayr5.

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碩士<br>國立交通大學<br>電子物理系所<br>106<br>The aim of this thesis is to study the influences of birefringence effect of gain crystal on the output polarization states for the passively Q-switched (PQS) orthogonally polarized lasers. Considering the stress-induced birefringence to the isotropic gain crystals, we firstly compared the temporal dynamics of the orthogonally polarized pulse trains of the Nd:YAG and c-cut Nd:YVO4 PQS lasers . Experimental results reveal that the two orthogonally polarized states of the Nd:YAG PQS laser will exhibit regular energy switching behavior in the pulse trains, whereas
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20

Chen, Li-Hsuan, and 陳立宣. "The study of passively Q-switched Yb:YAG ring laser." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/16847395367843408048.

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碩士<br>國立中山大學<br>光電工程研究所<br>94<br>Compared with Nd:YAG, the traditional high power solid state laser gain medium, Yb:YAG has less quantum defect, no excited state absorption, and longer fluorescence lifetime, which makes it suitable for Q-switched laser. In addition, concentration quenching is absent in Yb:YAG, higher concentration of active ion makes the thickness of gain medium thinner. For ring cavities, the necessity of symmetrical beam path is important, a thinner Yb:YAG crystal can reduce the shift of optical beam path and avoids cavity unstability. Thus, Yb:YAG is suitable for the two-mi
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21

Weng, Yi-Lung, and 翁義龍. "Intracavity Frequency-Doubled and Passively Q-Switched Blue Laser." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/71879682231142160516.

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碩士<br>國立中山大學<br>光電工程研究所<br>88<br>The purpose of this study is to develop a solid-state blue laser which has advantages of high power, short wavelength, and compact. It can be applied in micromaching, LIDAR, underwater ranging, biochemical techniques, and so forth. We increased the peak power of the laser effectively by a low-cost, small, and easy-use passive Q-switching technique. In addition, intracavity frequency-doubling is an economic way to achieve non-linear frequency conversion for blue generation. By integrating of these two techniques, we develop a compact all solid-state high-power b
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Fan, Shin-An, and 范信安. "Study of All Fiber Passively Q-Switched Pulses Laser." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/18202805653536288799.

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碩士<br>中原大學<br>應用物理研究所<br>95<br>An all-fiber passive Q-switched pulsed laser has been established and its performance has been investigated. The laser system was configured by using a Samarium (Sm)-doped fiber as saturable absorber, a Yb3+-doped double cladding fiber as the gain medium, and a Bragg-fiber gratings as the optical cavity. In the past, most of the Q-switched fiber lasers are consist of bulky elements that normally invoke sophisticated designs and are usually drawback by incompactness. Here, the conventional crystal saturable absorber was replaced by a Sm-doped fiber, making thi
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23

Lin, Yung-Hsiang, and 林泳詳. "Study of Passively Q-switched Lasers with Volume Bragg Grating." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/62045743617257417877.

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碩士<br>國立清華大學<br>光電工程研究所<br>96<br>In this thesis, the theory of Passively Q-witched Laser will be discussed in detail. A Volume Bragg Grating (VBG) was used to eliminate longitudinal mode in cavity. The gain medium was Nd:GdVO4 with 1% Nd doped and the saturable absorber was Cr:YAG. There were four laser systems finished step by step including (1) CW laser generation with linear cavity (2) passively Q-switched laser generation with linear cavity (3) CW laser generation with V-type cavity (4) passively Q-switched generation with V-type cavity. VBG was used in the third and the fourth system
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24

Yang, Yeon-Lung, and 楊永隆. "Resonator-Configuration-Dependent Dynamics of Passively Q-Switched Nd:YAG Lasers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/94664830333313182216.

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碩士<br>東海大學<br>物理學系<br>92<br>In this thesis, we experimentally study the resonator-configuration dependent dynamics in an axially pumped passively Q-switched Nd:YAG laser with a plane-concave cavity. We observed the average output power, repetition rate and pulse width as a function of the cavity length at different pump power. Our investigation shows that the laser pulse train will fall into unstable when the cavity length is adjusted near the edge of the geometric stable resonator configuration. We also find that the laser tends to run into multiple transverse modes in this region. Therefore,
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25

Chang-ChingTsai and 蔡長青. "Passively Q-switched all-fiber laser at high peak power." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/54336188897487780061.

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碩士<br>國立成功大學<br>微電子工程研究所<br>104<br>This thesis focused on simulation of Q-switched pulsed laser and implement the passively all- Yb+3fiber Q-switched pulsed laser at high peak power using mode-field area mismatch method in dual cavity. Since the output power of single-mode laser diode is too low，we use multi-mode laser and cladding pumped laser system to boost the output power of laser system and achieve the high power Q-switched all-fiber laser system. We also derive some theories about mode-field mismatch method and rate equations about dual cavity. Based on the outcome in the chapter2，we e
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26

Te-LunYen and 顏德倫. "Study on 1590-nm passively Q-switched all-fiber laser." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m9ww3x.

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27

Madlala, Bigboy. "Designing a low cost passively Q-switched solid state laser transmitter." Thesis, 2017. https://hdl.handle.net/10539/24990.

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A dissertation submitted to the Faculty Of Science in partial fulfilment of the requirements for the degree of Master of Science by research only in the School of Physics, University of the Witwatersrand, Johannesburg. July 11, 2017.<br>A discrete Q-switched laser that gives a side-lobed single pulse as a laser output was implemented; followed by studying energy extraction e ciencies and pulse characterisation. The aim was to help design a passively Q-switched laser that gives a smooth single pulse of optimum energy as a laser output. The smoothness feature in a single pulse is important
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Chen, Yi-chun, and 陳怡君. "Spatial and temporal behavior in diode-pumped passively Q-switched laser." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/8t4y2h.

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碩士<br>國立交通大學<br>電子物理系所<br>92<br>We can obtain high peak power laser with absorber inside cavity. High peak power lasers are applied to distance measuring, radar, medical system and industry marker process. The lasers which are used to be the distance measuring tools has a series pulse delay problem. In our thesis, we will discuss that the transverse modes of different cavities and the variation of pulse delays of different mode position. Delay in pulse arrival times from hundreds of picoseconds to several tens of nanoseconds can be observed in our experiment.
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29

Huai-MinHuang and 黃懷民. "Full-band passively Q- and gain-switched Yb3+ all-fiber laser." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/99486101101667485629.

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碩士<br>國立成功大學<br>微電子工程研究所碩博士班<br>98<br>The purpose of the study is to produce a passively pulsed Yb3+ all-fiber laser that self-balances between being Q-switched at 0.97-0.98 μm and being gain-switched at 1-1.12 μm, using a continuous-wave 915 nm pump laser diode. The device was experimentally demonstrated at 976 nm of Q-switching, and 1064 nm of gain switching. With pump power of 110 mW, a single-mode Q-switched pulse at 976 nm with pulse energy of 1.5 μJ and pulse duration of 275 ns was achieved. Furthermore, the rate equations to simulate the interactions between the dual-wavelength photons
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Liao, Chien-Hsun, and 廖建勛. "Pump and cavity effects in a passively Q-switched Nd:YVO4 lasers." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/23300563772634102279.

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碩士<br>東海大學<br>物理學系<br>96<br>In this thesis, we experimentally study pump and cavity effects in passive Q switching of diode-pumped a-cut and c-cut Nd:YVO4 lasers. The average output power, pulse width, and period were measured as functions of the pump spot size and resonator configuration. Our investigation shows that larger pump spot size is favorable for good Q switching. Suppression and enhancement effects on passive Q switching were observed near the border of geometrically stable resonator figuration. We also find that c-cut Nd:YVO4 crystal is a more preferable gain medium than a-cut
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31

Tsung-Yuan, Tsui, and 崔宗元. "The Study of the Passively Q-Switched Nd:YAG/Cr4+:YAG Laser." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/56366526211591825702.

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碩士<br>國立中山大學<br>光電工程學研究所<br>86<br>Passively Q-switched laser is the most simple and economic one in all kinds of Q-switched lasers. Dye has been used in passively Q-switched laser as satur-able absorber, but bleaching and deterioration make it trouble for frequent re-placing, and there is no way for direct control of the pulse repetition rate.T- iming jitter is a serious problem for this type of laser. In this thesis, a diode-laser-longitudinally pumped Nd:YAG/Cr4+:YAG Q-swi-tched laser is studied. Cr4+:YAG is a good saturable absorber for passively Q-switched laser because of its good mate
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32

Dong-LinLi and 李東霖. "Radial and azimuthal polarizations in passively Q-switched solid-state laser." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/73158684348863903295.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>101<br>Radially and azimuthally polarized beams were generated in passively Q-switched Nd:GdVO4 laser with a Cr:YAG saturable absorber. Based on the cavity design, the cavity configuration simultaneously satisfied the thereshold of the passive Q-switching and the generating condition of the cylindrical vector beam. When the pump power was 5W, the pulse width, repetition frequency, and the average power were 110 ns, 12.3 kHz, and 270 mW, respectively. The pulse operation had better polarization ratio than that of continuous-wave operation. Moreover, the spatial-depe
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33

Lee, Yin-Wen, and 李穎玟. "Output Power Maximization of a Diode Pumped Passively Q-Switched Microchip Laser." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/86971500869292581560.

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碩士<br>國立清華大學<br>電機工程學系<br>88<br>Optical characteristics of the laser gain medium, saturable absorber and reflectivity of the output coupler mirror determine the output performance of a passively Q-switched microchip laser. However, the conventional method of enhancing the peak power, in which the pulse width is narrowed by shortening the cavity length, has a complex chip fabrication process. Therefore, this thesis presents a novel means of increasing the peak power of a diode pumped passively Q-switched microchip laser with a fixed cavity configuration. The thermal focusing theory indicates th
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34

Pan, Lei. "Experiment and modeling of passively Q-switched ytterbium doped double-clad fiber lasers." Phd thesis, 2010. http://hdl.handle.net/10048/1360.

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High power passively Q-switched fiber lasers have been demonstrated with different ytterbium doped double-clad fibers by using Cr4+:YAG saturable absorber. With small (5.4 m) and medium (10 m) core fibers, single mode outputs have been obtained with pulse energy of tens of J, pulse duration of the order of a hundred nanoseconds and pulse-repetition-rate of up to 300 kHz. A theoretical model is developed to predict the laser spectrum and numerically simulate the output characteristics versus pump power. The focused beam in the Cr4+:YAG crystal is assumed to have a Gaussian profile and is analyz
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Shyu, Shaw-Wen, and 徐紹文. "Design and Operation of a Passively Q-Switched, Single-Mode Nd:YAG Ring Laser." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/08668358905349111785.

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碩士<br>淡江大學<br>物理學系<br>87<br>We developed a flash-lamp-pumped saturable-absorber (SA, LiF:F2-) Q-switched single-longitudinal-mode Nd:YAG ring laser with optical feedback, in which one of the two output beams was partially reflected as the feedback. The pulse forming dynamics within the laser cavity and the features of laser operation are the points of our investigation. Because of optical feedback, the counter propagating fields within the ring cavity may influence each other significantly in the course of pulse development. Since the operation of this type of lasers is closely related to the
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36

Li, Wei-Lun, and 李瑋倫. "Investigation of Nd:YLF laser crystal on continuous-wave and passively Q-switched performance." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/31613356958999169742.

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碩士<br>國立交通大學<br>理學院應用科技學程<br>99<br>This thesis is aimed to investigate the continuous-wave (CW) and passively Q-switched (PQS) laser performance of the a-cut Nd:YLF gain medium with the wedged angle of 0˚ and 3˚, respectively. Since the Nd:YLF crystal has two emission wavelengths which are π-polarization (1047nm) and σ-polarization (1053nm) in 4F3/2 → 4I11/2, it is practically important to select pure π-polarization (1047nm) and pure σ-polarization (1053nm) independently. Although the wavelength-selection can be achieved with additional components in the laser cavity, this would inevitably l
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37

Wang, Chien Hung, and 王健鴻. "The Study of the Passively Q-Switched Nd:YAG/Cr4+:YAG Laser with External Modulation." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/30600988871297783396.

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碩士<br>國立中山大學<br>光電工程研究所<br>87<br>The timing jitter is a very serious problem in a passively Q-switched laser. However, most of the work of passively Q-switched laser concentrated on the shortening the pulsewidth, increasing the pulse energy or peak power. Little work has been done on the timing jitter for a passively Q-switched laser. In this study, a theoretical simulation is provided to explain the timing jitter and a new method is proposed to improve this problem. Our simulation result indicated that the spontaneous noise in the microwatt range significantly affects the repetiti
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38

Yueh-chengTsai and 蔡岳呈. "Study on passively Q- and gain-switched all-fiber laser at high repetition rates." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/33655040535263460603.

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碩士<br>國立成功大學<br>微電子工程研究所<br>104<br>This thesis focused on repetition rate of the Q-switched laser. We have used a mode-filed-area (MFA) mismatch method, setting a passively all-fiber erbium Q-switched laser with Er3+ fiber as a SAQS. But the lifetime of Er3+ SAQS is too long to relax the absorption population, and that causes incompletely self-Q-switching mechanism. So we designed a dual-cavity laser structure, which could ignore the SAQS relaxation lifetime and been able to acquire a high repetition rates laser by high power pump. Using this dual-cavity laser structure with multi-mode light s
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Xing-WeiLiao and 廖興維. "A study and improvement of a passively Q-switched all-fiber laser at 976nm." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ws7rd9.

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碩士<br>國立成功大學<br>微電子工程研究所<br>105<br>In this paper, the previous results of the laboratory are studied to study the characteristics of ytterbium-saturated, passive, all-fiber pulsed laser systems. A 915 nm laser diode was used as the driving source for the continuous wave laser and the dual resonator system was set at 976 nm and 1030 nm. At the same time, the modal field mismatch technique is used to accelerate the self-balancing mechanism of saturated absorber, and the all-fiber laser system is set up. In addition, the use of Matlab simulation of the laser equation, auxiliary simulation of the
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40

Chang, Chuan-Ching, and 張專慶. "Study of Self-Mode-Locked Lasers and Passively Q-Switched Lasers with Nd:YVO4 Crystals." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/fk6789.

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博士<br>國立交通大學<br>電子物理系所<br>106<br>Because of the advantages of high absorption coefficients and moderate thermal conductivities, the Nd:YVO4 crystal has been confirmed to be a promising gain medium for solid-state systems to achieve good self-mode-locked (SML) and passively Q-switched (PQS) lasers effectively. To further improve the performance of output efficiency and temporal stability, the physics of the SML and PQS operation in the Nd:YVO4 lasers is deeply studied in this thesis. At the beginning, a thermally insensitive resonator is designed to explore the influence of longitudinal mode sp
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41

Feng, Ying-Wan, and 馮嫈菀. "Investigation of orthogonally polarized passively Q-switched monolithic diffusion-bonded Nd:YAG/Cr4+:YAG laser." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/46x43g.

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碩士<br>國立交通大學<br>理學院應用科技學程<br>106<br>The aim of this thesis is to study the relationship between orthogonal polarization and laser longitudinal modes in passively Q-switched (PQS) lasers. First, we change the crystal from isotropic into anisotropic by applying mechanical stress, and compare the temporal dynamics and spectrum in monolithic diffusion-bonded Nd:YAG/Cr4+:YAG PQS laser. Experimental results reveal that the period between two orthogonal polarizations in PQS laser is correlated with ratio of the lasing longitudinal mode numbers and we can realize multi-longitudinal-mode operation. We
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42

En-SzuOu and 歐恩賜. "Establishment and Evaluation of a LIDAR system with a passively Q-switched fiber laser." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9nq2b3.

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43

Wang, Shi-Wei, and 王世偉. "Systematic observation of passively Q-switched Nd：YVO4 laser with Cr：YAG as a saturable absorber." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/bm593f.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>108<br>In this study, a systematic observation of a passively Q-switched Nd：YVO4 laser by varying initial transmission of saturable absorbers and reflectance of output couplers. When the reflectivity of the output coupling mirror is 70% and the initial transmission of Cr：YAG is 67%, the laser performance such as the pulse energy, pulse width, and peak power are 4.38μJ, 6.65ns, and 659.1W, respectively. The rate equations of passive Q-switched laser are used to simulation the influence between the reflectance of output mirror and laser properties.
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44

Hong, Yi-Rui, and 洪一瑞. "A study on the general performance of a diode-pumped passively Q-Switched Nd:YVO4 laser." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/62859536964063790031.

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碩士<br>淡江大學<br>物理學系<br>91<br>The output of a of diode-pumped passively Q-switched lasers is closely related to the pumping condition; however, this type of lasers are usually treated in theory by rate- equation models in which the effects of pump light on laser are neglected; the relationship between the laser output and pumping condition is thus ignored. In this thesis we investigate the output characteristics of Nd:YVO4/Cr4+:YAG Q-switched lasers using rate equations allowing for the effects of pump and the decay of relevant energy levels.Experiments on CW Nd:YVO4 lasers and second threshold
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Chang, Yu Chang, and 張裕昌. "Energy adjustable passively Q-switched micro-laser with a diffusion-bonded Nd:YAG/Cr4+:YAG crystal." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8mxx99.

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碩士<br>國立交通大學<br>理學院應用科技學程<br>103<br>To demonstrate an energy adjustable passively Q-switched laser, a diode laser pumped Nd:YAG crystal diffusion-boned with a wedged Cr4+:YAG crystal is utilized. By changing the transverse pump location of the laser diode on the laser crystal, the initial transmission of the saturable absorber can be flexibly adjusted to achieve the variation of output pulse energy. The experimental result for different crystal length and different pump area are also shown in the thesis. In addition, the multi-transverse-mode output is eliminated to maintain good beam quality
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46

Shin-HaoHung and 洪士豪. "Passively Q-switched erbium all-fiber lasers by use of thulium doped saturable-absorber fibers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/90636310769732091982.

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碩士<br>國立成功大學<br>微電子工程研究所碩博士班<br>98<br>We demonstrate all-fiber passively Q-switched erbium lasers at 1570 nm using Tm3+-doped saturable-absorber fibers. The absorption cross section of a Tm3+-doped fiber at 1570 nm was measured in a bleaching experiment to be about 1.44?10-20 cm2. With a thulium-doped fiber, sequential pulses with a pulse energy of 9??J and a pulse duration of about 420 ns were stably produced at repetition rates in the range 0.1 to 3 kHz. The corresponding deviation of the repetition-rate stability was 4 to 188Hz. The loss caused by photo-darkening was about 12% after a long
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47

Liao, Yu-Lan, та 廖羽嵐. "Passively Q-Switched Nd-doped 1.3μm Lasers with InP-based Quantum Wells as Saturable Absorbers". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/34040494724747223811.

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碩士<br>國立交通大學<br>電子物理系所<br>93<br>All-solid-state Q-switched lasers at 1.3-μm wavelength are of practical importance for numerous application such as medical diagnostic, fiber sensing, distance measurements, intracavity optical parametric oscillator, intracavity Raman conversion. Because of thermal effects, CW laser can’t be used practically. If using Quantum Wells/barrier structures be absorbers for Nd:YVO4 lasers, it can produce a high peak power, high pulse energy, and stable Q-switching laser. Nowadays, the saturable absorbers for 1.3-μm lasers comprise V3+:YAG, Co2+:MgAl2O4, and SESAMs. How
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48

Huang, Chin-Hao, and 黃金豪. "Master Oscillator of Fiber Power Amplifier Seeded by Nd:YVO4/Cr4+:YAG Passively Q-Switched Laser." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/23406166527188827346.

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碩士<br>國立交通大學<br>理學院應用科技學程<br>99<br>We report on an analysis of the design guideline of a hemispherical resonator Nd:YVO4/Cr4+:YAG passively Q-Switched (PQS) laser by optimization of the mode matching condition and agreement with the good PQS criterion. Cr4+:YAG saturable absorbers with various initial transmission were used to investigate the performances of the laser configuration. Then we inject these high-peak-power PQS laser to realize the single-stage, linear-polarized fiber amplifier. With the seed laser of pulse repetition rate (PRR) of 50 kHz, the amplifier emits pulse energy of 178 an
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49

Chen, Yu-Chen, and 陳昱辰. "Design and application of quasi-CW diode-side-pumped milli-joule passively Q-switched laser." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21451164844629163586.

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碩士<br>國立交通大學<br>電子物理系所<br>102<br>High-peak-power eye-safe pulsed lasers have been widely used in industry applications. In this thesis, we utilize the Nd:YVO4 and the Nd:YLF crystals as gain mediums with the Cr4+:YAG crystal as the saturable absorber to explore a passively Q-switched laser. Through the theoretical analysis of second threshold condition, we adopt the design of nearly hemispherical cavity and the diode-side-pumping configuration to realize the high peak power output. Futhermore, we demonstrate the eye-safe laser by adding the KTP crystal to perform the extracavity optical parame
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50

Gu, Shun-An, and 古舜安. "Exploring antiphase dynamics of a simultaneous passively Q-switched orthogonally polarized dual-wavelength Nd:YLF laser." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b9aaja.

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碩士<br>國立臺灣海洋大學<br>光電科學研究所<br>105<br>This paper have investigated the orthogonal polarization oscillations and associated dynamical behaviors in laser-diode-pumped Nd:YLF laser, the antiphase state of the system is changed from the π-polarization direction to the transition between the π-polarization and the σ-polarization in the time-dependent behavior. antiphase dynamics was achieved by the peak simulation emission cross section and the nonlinear absorption of the Cr4+: YAG saturated absorber and the thermal lens effect. The antiphase dynamics of this laser were investigated by separating the
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