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Dissertations / Theses on the topic 'High power lasers engines'

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Published: 14 March 2023

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1

MIRIGALDI, ALESSANDRO. "Power scaling of high power lasersystems." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2966325.

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2

Elliott, Stella N. "High power semiconductor lasers." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54136/.

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Using red and near infra-red emitting quantum well and quantum dot based devices I have modelled the nearfield and farfield intensities and distribution in various waveguide structures. I compared the effect of various factors on the power density at catastrophic damage and found the greatest effect from the current pulse length and dot or well nature of the active region, for the first time in the AlGaInP material system. At short pulse length the quantum dot devices achieved a power density of 17 MW/cm<super>2</super> compared to 14 MW/cm<super>2</super> for quantum well lasers, and then pro
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3

Alvarez-Chavez, Jose Alfredo. "High-power fibre lasers." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15478/.

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This thesis reports on the experimental study of high-power, high-energy, cladding-pumped, rare-earth (Yb3+, Er3+/Yb3+)-doped fibre lasers. Some of the main capabilities of fibre lasers such as: High brightness and thermal properties were exploited for the development of a variety of continuous wave (CW) and Q-switched devices, whose characteristics also includes compactness. Our devices could already be considered an option for several applications. The 25-year long scientific and commercial evolution that fibre lasers have experienced is discussed in the first two chapters. The invention of
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4

Abram, Richard Henry. "High power waveguide array lasers." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/622.

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5

Park, Jung-Hyun. "High-gain, high-power free electron lasers." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/30964.

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The Paladin FEL experiment is shown to exhibit clear and dramatic effects governed by the electron beam velocity distribution for the first time. The FEL integral equation is used to show that there is significant broadening of the gain spectrum due to the Gaussian velocity distribution, and also shows a plateau in the gain evolution along the undulator due to a triangular-shaped velocity distribution. The gain spectra and power evolution from simple, single- mode simulations are compared to the ELF experiments. The microwave power evolution along the undulator is compared as well for both the
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6

Voughs, Tyrone Y. "High-power amplifier free electron lasers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FVoughs.pdf.

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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2006.<br>Thesis Advisor(s): William B. Colson, Robert L. Armstead. "June 2006." Includes bibliographical references (p. 57). Also available in print.
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7

Hastie, Jennifer E. "High power surface emitting semiconductor lasers." Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399721.

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8

Wang, Jing. "High-average-power planar waveguide lasers." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/50198/.

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Reported in this thesis is some progress towards high-average-power diode-pumped planar waveguide lasers. As a format of the laser active medium, planar waveguides take advantage of their extreme slab geometry, which is compatible with that of high-power diode lasers, offer a great degree of versatility of the pump arrangement, have excellent thermal handling capability, and deliver high optical gains per unit pump power. Pumped with different schemes, three kinds of planar waveguides are investigated herein: direct-bonded double-clad planar waveguides, ion-exchanged tapered waveguides, and th
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9

Pusino, Vincenzo. "High power, high frequency mode-locked semiconductor lasers." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5174/.

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Integrated mode-locked laser diodes are effective sources of periodic sequences of optical pulses, which have always been of great interest for a range of spectroscopy, imaging and optical communications applications. However, some disadvantages prevent their widespread use, such as the restricted tuning of their repetition rate and their output power levels never exceeding a few mW. This thesis reports on the work done to address those limitations. Two main findings are presented, the first being the generation of ultra-high repetition rate optical signals through external injection of two co
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10

Tisch, John William George. "Studies of high harmonic generation using high power lasers." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309530.

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11

Jain, Deepak. "Novel optical fibers for high power lasers." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386233/.

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High power fiber lasers have several applications thanks to their outstanding features such as good beam quality, all fiberized compact device size, robustness, wavelength tuning, high wall-plug efficiency, and low cost. Due to these features high power fiber lasers are replacing other solid-state lasers for several applications. Fiber lasers are being used commercially for several applications such as surgery, material processing (cutting, drilling, polishing etc.), oil and gas sensing, pumping several other lasers, and space communication etc. However, nonlinear effects restrict the output p
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12

Martin, Kevin Ian. "High power, diode pumped, single frequency lasers." Thesis, University of Southampton, 1996. https://eprints.soton.ac.uk/396626/.

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This thesis presents experimental and theoretical work on the development of high power (i.e. multi-Watt) single frequency lasers, with the main emphasis on using intra-cavity second harmonic generation to produce high power visible output. With such a laser, pumped by a beam shaped 20W diode bar, we have obtained over 3W of TEM00 single frequency output at 532nm. Because of the strong non-linear effects introduced into the resonator cavity by the frequency doubler, the behaviour of the laser can be significantly altered. In particular, there is the previously unreported phenomenon of mode-hop
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13

BRAGLIA, ANDREA. "High Power Fiber Lasers for Industrial Applications." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2506061.

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Fiber lasers can be considered a revolutionary technology in the laser field thanks to their unique properties, such as high efficiency, simplicity, compactness and robustness. These features have allowed in the last ten years their outstanding growth both in scientific and industrial applications, eroding the market share of traditional laser sources like solid-state and gas lasers. Fiber lasers power scaling to the kilowatt range is now well established and, thanks to the fiber confinement, excellent output beam quality can be obtained, with a remarkable benefit for applications. Today, high
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14

Naidoo, Darryl. "High brightness lasers." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97044.

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15

Kheder, Abdul-Sameei Yaseen. "Starting high inertia, high friction loads from limited power sources." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184455.

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At starting, electrical motors require large power and current. This may not be a problem in a large electrical system but it may be very severe for a limited power source like a solar array. If a direct approach is taken the array rating must be 5-6 times the motor rating in order to start the motor and its high inertia high friction load. Batteries have been used to store energy and supply that energy for starting. Batteries need maintenance and their low efficiency is a problem too. In this study a new type of controller has been suggested and developed for the use with D.C. motors. Compute
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16

Ottaway, David. "Medium power stable lasers for high precision metrology /." Title page, abstract and contents only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09pho89.pdf.

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17

Frist, Duane C. "Improved beam jitter control methods for high energy laser systems." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FFrist.pdf.

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Thesis (M.S. in Astronautical Engineering)--Naval Postgraduate School, December 2009.<br>Thesis Advisor(s): Agrawal, Brij ; Kim, Jae Jun. "December 2009." Description based on title screen as viewed on January 28, 2010. Author(s) subject terms: High Energy Laser (HEL), beam control, Fast Steering Mirror (FSM), two axis gimbal, stabilization, video tracking, feedforward control, adaptive filter. Includes bibliographical references (p. 69). Also available in print.
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18

Murray, Paul R. "High peak power, pulsed, planar waveguide CO2 lasers." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1225.

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19

Scahill, Charlanne Mary. "Design of high power, single frequency semiconductor lasers." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624851.

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20

Nikitichev, Daniil I. "High power ultra-short pulse quantum-dot lasers." Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/b7cec111-5ed7-4020-9fad-794d817e8f61.

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In this thesis, novel multi-section laser diodes based on quantum-dot material are designed and investigated which exhibit a number of advantages such as low threshold current density; temperature-insensitivity and suppress carrier diffusion due to discrete nature of density of state of quantum-dots. The spectral versatility in the range of 1.1 µm – 1.3 µm wavelengths is demonstrated through novel mode-locking regimes such as dual-wavelength mode-locking, wavelength bistability and broad tunability. Moreover, broad pulse repetition rate tuning using an external cavity configuration is presente
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21

Friel, Graham John. "Diode-pumped Nd:YLF lasers for high-power operation." Thesis, University of Southampton, 1998. https://eprints.soton.ac.uk/394397/.

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This thesis presents the results of investigation into a variety of high-power, miniature Nd:YLF lasers end-pumped by diode-lasers. Diode-pumping enables more compact, efficient and reliable operation than alternative laser sources. Three main areas of research have been investigated, namely mode-locking, novel laser-amplifiers and high-brightness end-pumping. The main motivation was to develop simple picosecond-oscillators, suitable for pumping synchronously-pumped optical parametric oscillators. These devices deliver widely tunable radiation and have applications in ultrafast spectroscopy. U
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22

Vazquez, Zuniga Luis Alonso. "Ultrafast high power fiber lasers and their applications." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/340703/.

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In this thesis I report experimental studies toward developing versatile, compact, and reliable ultrafast sources in the 1.5 micron wavelength region, and their power scalability. The first part of the thesis reports on the development of a stable all-fiberized wavelength-tunable frequency-shifted feedback (FSF) picosecond laser. Stability of the passive mode-locking mechanism is achieved by combining the effects of nonlinear polarization evolution and a frequency shifting mechanism carried out by an acousto-optic modulator. The novel configuration generates pulses in the range of ~ 34 to 66 p
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23

Chard, Simon Peter. "Development of versatile high power bounce geometry lasers." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6184.

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This thesis details an investigation into the development of bounce geometry lasers to achieve a more versatile range of laser characteristics. The bounce geometry has matured in recent years into a useful solid-state pumping scheme, but its performance has to date been limited by a number of factors, as well as largely restricted to neodymium systems. For real-world application, a more versatile range of laser characteristics would be desirable. A new design for a bounce geometry amplifier is presented that achieves a symmetric gain profile and thermal lens by control of the amplifier dimensi
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24

Li, Hongbo. "Modeling Compact High Power Fiber Lasers and VECSELs." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202712.

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Compact high power fiber lasers and the vertical-external-cavity surface-emitting lasers (VECSELs) are promising candidates for high power laser sources with diffraction-limited beam quality and are currently the subject of intensive research and development. Here three large mode area fiber lasers, namely, the photonic crystal fiber (PCF) laser, the multicore fiber (MCF) laser, and the multimode interference (MMI) fiber laser, as well as the VECSEL are modeled and designed.For the PCF laser, the effective refractive index and the effective core radius of the PCF are investigated using vectori
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25

Bai, Jinxu. "High Power High Energy Ytterbium-doped Fiber Amplifier System." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/728.

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Fiber amplifiers with high power and high pulse energy are strongly in demand for both scientific research and industrial applications. Ytterbium-doped fiber has been an outstanding choice for its broad-gain bandwidth and excellent power conversion efficiencies. In this dissertation, we introduced a compact high power high pulsed energy laser system with chirally coupled core (3C) Yb-doped fibers as the gain media. Traditional standard fibers and photonic crystal fibers are not suitable for compact high power high pulse energy laser systems because of poor higher order modes (HOMs) management
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26

Sims, Robert. "Development of Thulium Fiber Lasers for High Average Power and High Peak Power Operation." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5706.

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High power thulium fiber lasers are useful for a number of applications in both continuous-wave and pulsed operating regimes. The use of thulium as a dopant has recently gained interest due to its large bandwidth, possibility of high efficiency, possibility of high power and long wavelength ~1.8 – 2.1 [micro]m. The longer emission wavelength of Tm-doped fiber lasers compared to Yb- and/or Er-doped fiber lasers creates the possibility for higher peak power operation due to the larger nonlinear thresholds and reduced nonlinear phase accumulation. One primary interest in Tm-doped fiber lasers
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27

Barber, J. R. "Variable-compression-ratio pistons for high power output diesel engines." Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379249.

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28

Smith, Scott A. "High power infrared vertical external cavity surface emitting lasers." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501809.

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The Vertical External Cavity Surface Emitting Laser (VECSEL) is now firmly established as an important category of semiconductor laser with many advantageous properties including high output power, excellent beam quality and wavelength flexibility. Thermal management of the optical pumped arrangement is of critical importance to ensure optimum operation, and crystalline heatspreader platelets have been successfully used in this role.
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29

Lee, Shinwook. "HIGH POWER MODE-LOCKED SEMICONDUCTOR LASERS AND THEIR APPLICATIONS." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3195.

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In this dissertation, a novel semiconductor mode-locked oscillator which is an extension of eXtreme Chirped Pulse Amplification (XCPA) is investigated. An eXtreme Chirped Pulse Oscillator (XCPO) implemented with a Theta cavity also based on a semiconductor gain is presented for generating more than 30ns frequency-swept pulses with more than 100pJ of pulse energy and 3.6ps compressed pulses directly from the oscillator. The XCPO shows the two distinct characteristics which are the scalability of the output energy and the mode-locked spectrum with respect to repetition rate. The laser cavity des
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30

Holdsworth, Adrian Richard. "Brightness conserving optical systems for high power diode lasers." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/583.

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31

Hayward, Robert Alan. "High-power diode-pumped solid-state 2 micron lasers." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/41525/.

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Brightness scaling of diode-bar end-pumped solid-state lasers producing efficient output radiation in the 2 μm wavelength region is investigated. Problems and strategies for power scaling diode-bar end-pumped lasers in the 2μm region are also discussed. Thermal lens measure ments on Tm3+:YAG and Tm3+:(Lu,Y)AG were made. Thermal lens dependency on resonator loss is observed and attributed to heating from upconversion. High-power room temperature diode-bar end-pumped Tm3+:(Lu,Y)AG were developed. Efficient high power operation of the Tm3+:YAG laser producing 14.2W of output power at 2.013μm for
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32

Saadat, S. "Investigation of the generation of high-density matter using high power lasers." Thesis, Queen's University Belfast, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373544.

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33

Strauss, Hencharl Johan. "Thermo-optical effects in high-power end-pumped vanadate lasers." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4007.

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Thesis (PhD (Physics))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The output power of end-pumped lasers is mainly limited by thermal effects in the bulk crystal gain material. The thermal effects either fracture the crystal or cause degradation in the laser beam quality and output power. This is especially pronounced in Nd:YVO4 and Nd:GdVO4 which exhibit strong thermal lensing. These two Nd3+ vanadate materials are of great value because of their high emission cross sections which makes them excellent gain materials for mode-locked, high repetition rate Q-switched and intra-c
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34

Bogan, Christina [Verfasser]. "Stabilized High Power Lasers and Spatial Mode Conversion / Christina Bogan." München : Verlag Dr. Hut, 2013. http://d-nb.info/1033041505/34.

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35

Zhang, Zhichao. "Numerical Modelling of High-Power Self-Organizing External Cavity Lasers." Thesis, University of Nottingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523226.

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36

Jain, Apurva. "Applications of Volume Holographic Elements in High Power Fiber Lasers." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5318.

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The main objective of this thesis is to explore the use of volume holographic elements recorded in photo-thermo-refractive (PTR) glass for power scaling of narrow linewidth diffraction-limited fiber lasers to harness high average power and high brightness beams. Single fiber lasers enable kW level output powers limited by optical damage, thermal effects and non-linear effects. Output powers can be further scaled using large mode area fibers, however, at the cost of beam quality and instabilities due to the presence of higher order modes. The mechanisms limiting the performance of narrow-li
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37

Tandoi, Giuseppe. "Monolithic high power mode locked GaAs/AlGaAs quantum well lasers." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2721/.

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In this thesis, approaches for increasing the output power in monolithically integrated semiconductor mode locked (ML) lasers were investigated. The wavelength range considered is the range of operation of low temperature grown GaAs photomixers, devices commonly used for THz generation. In particular, two GaAs/AlGaAs quantum well laser epistructures (operating at 830 nm and 795 nm) were considered, both with reduced optical confinement and elongated vertical optical mode size. In this work, such laser epistructures, commonly used by high power semiconductor laser manufacturers, were successful
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38

Deile, Jochen. "Power scaling of high brightness multi-kilowatt coaxial CO2 lasers." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/3297.

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The objectives of the work described in this thesis have been first, to develop a high brightness diffusion-cooled CO2 laser based on the annular discharge geometry and secondly, to scale up the output power to provide multi-kilowatt operation. A stable-unstable-hybrid resonator (helix-axicon resonator) serves as the starting point for the development. In order to address the brightness, polarization and temporal stability issues of this resonator several new features and concepts are introduced. High brightness is achieved by ensuring fundamental mode operation without truncating the mode in
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39

Cooper, Laurence James. "Fabrication of novel geometry fibre lasers for high power applications." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/38958/.

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This thesis details my work on the development of fabrication techniques for high power doped fibre lasers, using novel fibre geometries, and their demonstration. The main methods for increasing output power were using helical cores, multiple cores and large cores. A method for fabricating helical core fibres was proposed and implemented. Core and cladding pumped devices were successfully constructed, and were then tested in collaboration. A cladding pumped helical core fibre laser improved the beam from a 30μm core from an M2 of 3.3 to < 1.4, with a maximum output power of 64W and slope effic
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40

Chen, Kang Kang. "High power pulsed ytterbium doped fibre lasers and their applications." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/207735/.

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The aim of my project is to develop pulsed Ytterbium (Yb) doped fibre master oscillator power amplifier (MOPA) systems seeded by semiconductor lasers. I was principally focused on two specific projects aligned to sponsored programs of research within the ORC pulsed fibre laser group: the first project, TSB funded project LAMPS, aimed to develop an important class of next generation laser system capable of average output powers of more than 100 W when operating in both the nanosecond and picosecond regimes. The goal was to develop a fully fiberized, polarisation maintaining, single transverse m
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41

Wang, Tsuei-Lian. "High-Power Optically Pumped Semiconductor Lasers for Near Infrared Wavelengths." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/242398.

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Optically pumped semiconductor lasers (OPSLs) combine features including an engineerable emission wavelength, good beam quality, and scalable output power and are desirable for a wide variety of applications. Power scaling of OPSLs requires a combination of accurate epitaxial quantum design, accurate wafer growth and good thermal management. Here a fabrication process for OPSL devices was developed to ensure efficient OPSL device cooling and minimum surface scattering. A systematic thermal analysis was performed to optimize thermal management. Strategies for optimizing power extraction were de
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42

Hempel, Martin. "Defect mechanisms in diode lasers at high optical output power." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16834.

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In dieser Arbeit wird der Catastrophic Optical Damage (COD) zeitaufgelöst untersucht um die beteiligten physikalischen Mechanismen zu identifizieren. Der COD Prozess konnte zeitlich in drei Phasen unterteilt werden, die Alterung, der thermische Runaway (selbst verstärkende Rückkopplung) und das Sekundärschadenswachstum. Die erste Phase konnte durch eine neu eingeführte Art der beschleunigten Bauteilalterung auf den Nanosekunden-Bereich reduziert werden. Die Rolle des Laser-Lichtfelds als Energiequelle des COD-Prozesses wurde experimentell bestätigt. Die genutzten thermographischen Techniken
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43

Bouras, Vasileios. "High energy lasers for ship-defense and maritime propagation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FBouras.pdf.

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Thesis (M.S. in Applied Physics and M.S. in Electrical Engineering)--Naval Postgraduate School, December 2002.<br>Thesis advisor(s): William B. Colson, Phillip E. Pace. Includes bibliographical references (p. 81-83). Also available online.
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44

Seifert, Frank [Verfasser]. "Power stabilization of high power lasers for second generation gravitational wave detectors / Frank Seifert." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1008410470/34.

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45

Denvir, Donal Joseph. "Interaction of high power laser radiation with liquids." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235828.

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46

Ure, K. A. N. "The generation of short, tunable high power optical pulses." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383874.

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47

Akbar, Jehan. "High power mode locked lasers monolithically integrated with semiconductor optical amplifiers." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3461/.

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This thesis is concerned with the design, fabrication and characterisation of high power semiconductor mode locked lasers (SMLLs), operating at ~ 1.5 μm. The devices are based on a novel epitaxial structure with three quantum wells (QW) in the active region. The novel epitaxial structure was based on a commercially available five-QW AlGaInAs/InP epitaxial structure, with the number of QWs reduced to increase the gain saturation energy and a farfield reduction layer (FRL), and a spacer layer were inserted in the n-cladding layer. SMLLs based on both the five-QW and three-QW material, were fabri
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48

Lee, Jason Robert. "High power, diode-pumped, planar waveguide lasers with excellent beam quality." Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/443.

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49

Kao, Tsung-Yu. "From high power terahertz quantum cascade lasers to terahertz light amplifiers." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87923.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 201-208).<br>The terahertz (THz) frequency range (300 GHz to 10 THz, wavelength 30-1000 [mu]m), despite having many potential applications, is technologically relatively underdeveloped mainly because of the lack of suitable coherent radiation sources when compared with nearby electromagnetic radiation spectrum. The invention of the THz quantum cascade laser, a electronically-pumped semicond
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50

Daniel, Jae. "Wavelength selection and transverse mode control in high power fibre lasers." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/371750/.

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In this thesis we explore the wide parameter space of thulium doped silica fibre lasers,looking at various techniques for the control of operating wavelength and bandwidth as well as transverse beam profile. We demonstrate the extremely broad tunability of thulium fibre sources. Through various device architectures we show wavelength coverage over a 450nm wavelength range from 1660nm to 2115nm. With a simple external cavity containing an electronically controllable acousto-optic tunable filter we construct a wavelength agile tunable fibre source. This source demonstrates rapid wavelength selec
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