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Dissertations / Theses on the topic 'Lithium niobate'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Barry, Ian Eric. "Microstructuring of lithium niobate." Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/15498/.

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This thesis presents the results from an investigation into methods for micron-scale relief structuring of lithium niobate. A wet etch consisting of HF and HNO3 was applied, and directed by 1) patterning the ferroelectric domain structure of the samples and 2) illuminating the crystals with patterned 488nm light. Post-etch treatment of the structures resulted in ridge waveguides and alignment grooves, while pre-etch manipulation achieved an etch-stop. Ablation was investigated as a method of directly structuring the crystal and for patterning photoresist. The etch was found to leave the +z fac
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2

Jaeger, Nicolas August Fleming. "Integrated optical devices in lithium niobate." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/26300.

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A class of integrated optical devices is based on light propagation in optical channel waveguides. It includes optical modulators such as the integrated Mach-Zehnder (IMZ). Many applications have been proposed for such integrated optical devices. The present work was motivated by a proposed application to voltage determination on high voltage lines, for example, SF₆ bus ducts in Hydro substations. For the voltage measurement application two device types were proposed. The first includes devices using capacitive voltage dividers. A novel divider for the SF₆ bus duct application was proposed usi
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3

Wessel, Rudolf. "Modelocked waveguide lasers in lithium niobate /." Paderborn : HNI, 2000. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=008936815&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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4

Jorgensen, Jonathan David. "Electon paramagnetic resonance of lithium niobate heavily doped with chromium and lithium niobate codoped with magnesium and iron." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/jorgensen/JorgensenJ0810.pdf.

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In this thesis, electron paramagnetic resonance (EPR) was utilized in measuring and characterizing the dopant ions in three samples of lithium niobate (LiNbO₃). The first sample was LiNbO₃ of congruent composition doped with 0.25% mol chromium (LiNbO₃:Cr). This sample was studied in detail using two microwave frequencies, 9.4 GHz and 34.4 GHz. It was also studied both at room temperature and at 10 K. Several centers including complexes of Cr-Cr pairs were observed in addition to the most prevalent axial Cr³⁺ center. The other two samples were Li
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5

Mohamedelhassan, Ashraf. "Fabrication of Ridge Waveguides in Lithium Niobate." Thesis, KTH, Fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95360.

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6

Harun, Ahmad Mukifza. "Treparation of lithium niobate nanocrystals and nanocomposites." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595647.

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The rapid advancement in electronic industries is driven by variety in electronic and electrical miniaturization concept design. Enhancement in performance, for example better scaling, stable response, less performance fatigue and miniaturization is at the heart or global research interest. Consistent with this concept, this research targets the development of a ferroelectric composite comprising inorganic ferroelectric and ferroelectric polymer, with potential for applications as the gate in ferroelectric fielq effect transistors. The inorganic ferroelectric material in this research was lith
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7

Abernethy, Joyce Anne. "Novel devices in periodically poled lithium niobate." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15473/.

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This thesis describes the research carried out to develop several novel periodically poled lithium niobate (PPLN) devices. These devices exploit the ability to invert micro-domains of spontaneous polarisation in ferroelectrics such as lithium niobate. The fabrication of PPLN devices is described and extensive studies into factors influencing the poling quality are presented. In particular a comparison of material properties of unprocessed lithium niobate material from a range of different suppliers is carried out. Several novel PPLN devices are reviewed and two main devices are investigated -
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8

Chen, Li. "Hybrid Silicon and Lithium Niobate Integrated Photonics." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429660021.

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9

Harhira, Aïssa. "Photoluminescence polaron dans le niobate de lithium : approche axpérimentale et modélisation." Thesis, Metz, 2007. http://www.theses.fr/2007METZ052S/document.

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Le niobate de lithium (LN), en raison de ses propriétés, électro-optiques, optiques non linéaires et photoréfractives (PR) , s'impose comme un matériau de choix pour des applications en modulation, filtrage, stockage holographique ou conversion de fréquence optique. L'effet PR est gouverné à la fois par les centres profonds extrinsèques (Fe2+ et Fe3+ le plus souvent) et par les antisites niobium en site (Nbli5+), qui constituent des pièges préférentiels pour les électrons arrachés aux donneurs profonds et forment ainsi des polarons liés Nbli4+, caractérisables par une large bande d'absorption
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10

Valdivia, Christopher E. "Light-induced ferroelectric domain engineering in lithium niobate & lithium tantalate." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/65500/.

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The influence of illumination on ferroelectric domain engineering in lithium niobate and lithium tantalate is investigated. The conventional method of domain inversion is electric field poling, which suffers from several limitations such as a requirement for photolithography and high-voltage equipment, the formation of inhomogeneous electric fields, and a minimum domain size of micrometres. Through the use of directed laser light, either in the presence or absence of an externally applied electric field, these limitations can be overcome and new fabrication capabilities are revealed. Light-ass
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11

Wellington, Iain. "Direct UV writing of structures in lithium niobate and lithium tantalate." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/50699/.

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This thesis presents results from fabrication of UV direct write structures in lithium niobate and lithium tantalate. Unassisted direct writing of surface channel waveguides using lambda = 244 nm cw light resulted in polarisation specific waveguides fabricated on z- cut crystals. Waveguides were characterised using mode profiles, propagation losses, numerical aperture and refractive index measurements. In z-cut congruent lithium niobate, waveguides were written on the +z and -z faces producing structures that guided TM polarisation only with +z face waveguides exhibiting the lowest propagation
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12

Paul, Marcus. "Synthesis and characterisation of transition metal-doped lithium niobate and lithium tantalate." Thesis, University of Aberdeen, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319341.

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The study of ferroelectric LiNbO<SUB>3</SUB> and LiTaO<SUB>3</SUB> doped with transition metals involves the characterisation of LiNbO<SUB>3</SUB>/LiTaO<SUB>3</SUB> solid solutions in the systems Li<SUB>2</SUB>O-Nb<SUB>2</SUB>O<SUB>5</SUB>-M<SUB>x</SUB>O<SUB>y</SUB> and Li<SUB>2</SUB>O-Ta<SUB>2</SUB>O<SUB>5</SUB>-M<SUB>x</SUB>O<SUB>y</SUB> (M = Cr, Mn, Fe, Co, Ni, Cu). Compounds were made by solid state reaction at temperatures between 1000 and 1500°C, depending on the system studied. The emphasis of this work is on the characterisation of the defect structure of LiNbO<SUB>3</SUB>/LiTaO<SUB>3<
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13

Jaeger, Nicolas August Fleming. "Voltage induced optical waveguide modulators in lithium niobate." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29118.

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Two types of optical modulator were studied, both of the voltage induced optical waveguide type first proposed and demonstrated by Channin in 1971. An optical waveguide was created in an electrooptic substrate by applying voltage between two electrodes deposited on the substrate. Channin used wide electrode spacings which resulted in large operating voltages being necessary. The devices discussed in this thesis had much smaller electrode spacings and therefore operated at much reduced voltages. They are of the planar and ridge types. In the planar type the electrodes were deposited on top of a
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14

Pooley, Marina J. "The preparation and characterisation of nanocrystalline lithium niobate." Thesis, University of Kent, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399594.

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15

Sones, Collin Lawrence. "Domain engineering techniques and devices in lithium niobate." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15474/.

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This thesis presents the results from investigations directed at novel approaches to domain engineering single-crystal congruent lithium niobate at the micron/sub-micron scale for practical device applications. Experimental etch-rate measurements from a parametric study of etch-rates and etch-quality of single-crystal lithium niobate z-faces, as a function of specific ratios for mixtures of HF/HNO3, to ascertain whether the widely-employed 1:2 mixture was in fact optimum for achieving the largest differential etch-rates between lithium niobate z-faces, revealed that pure HF produced an etch-ra
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16

McCoy, Michael Anthony. "Microstructural characterization of titanium : lithium niobate optical waveguides /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487676847118483.

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17

Peace, Daniel C. "Thin-film Lithium Niobate for Integrated Quantum Optics." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/420851.

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The generation of broadband squeezed light is a vital resource within continuous-variable quantum information processing. In light-based quantum computation protocols, the amount of squeezing impacts computation error rates, therefore achieving fault-tolerant quantum computation requires a sufficiently high level of squeezing. Traditionally, squeezed light has been generated using bulk nonlinear crystals located within optical cavities, however this comes at the cost of a narrow squeezing bandwidth which reduces operational speed. Recently, the thin-film Lithium Niobate has emerged as a promis
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18

Pozza, Gianluca. "Development of an Optofluidic Platform in Lithium Niobate." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424115.

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Optofluidics is a promising interdisciplinary research and technological field, thanks to its wide potential of application in sector like medicine, chemistry, biology and environmental science. In this context the study of innovative materials including their properties, their efficiency, their limits and their possibility of leading to miniaturized devices is the key point for the overcoming of currently adopted strategies. A promising material that could satisfy new optofluidic requirements is Lithium Niobate (LiNbO3 - LN) thanks to its excellent optical and nonlinear optical properties. I
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19

Mohamed, Abdalla Mohab Sameh. "Reservoir computing in lithium niobate on insulator platforms." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0051.

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Cette étude concerne le calcul par réservoir à retard temporel, en anglais Time-Delay Reservoir Computing (TDRC) dans les plateformes de photonique intégré, en particulier la plateforme Lithium Niobate On Insulator (LNOI). Nous proposons une nouvelle architecture intégrée « tout optique », avec seulement un déphaseur comme paramètre modifiable pouvant atteindre de bonnes performances sur plusieurs tâches de référence de calcul par réservoir. Nous étudions également l'espace de conception de cette architecture et le fonctionnement asynchrone du TDRC, qui s'écarte du cadre plus courant consistan
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20

Reza, Selim. "Acoustooptically tunable waveguide lasers in erbium doped lithium niobate." [S.l.] : [s.n.], 2006. http://ubdata.uni-paderborn.de/ediss/06/2006/reza.

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21

Kuo, Hsin-Hui. "Investigation of an electrooptic tunable filter in lithium niobate." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5858.

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A polarization independent electrooptic add/drop tunable filter fabricated on a LiNbO3 substrate with a narrow -3 dB bandwidth (FWHM) of 1.56 nm operating in the 1.55 μm wavelength regime has been developed to meet the demands of fast tuning speed and increased channel capacity for dense wavelength division multiplexed (WDM) networks. The operation of the filter is based on passive polarization beam splitters and strain-induced phase-matched TE↔TM polarization mode converters. Extinction ratios as high as 20 dB for polarization beam splitters were achieved using zero-gap two-mode inter
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22

Benmouhoub, Chafia. "Lab-on-chip opto-électronique sur Niobate de Lithium." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2068.

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Les travaux de cette thèse s’inscrivent dans un projet de développement d’un Lab-On-Chip destiné à la biodétection. Les plateformes conçues sont basées sur des circuits optiques intégrés sur niobate de lithium. La particularité de ces circuits est qu’ils intègrent le phénomène d’interférence à la fonction de guidage des ondes lumineuses.La fonction d’interférométrie est assurée grâce à une cavité Fabry-Pérot intégrée à un guide d’onde rectiligne et à une structure Mach-Zehnder. Lorsque la surface des supports de ces circuits est bio-fonctionnalisée, ces microsystèmes deviennent sensibles à des
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23

Swanson, Claudia H., Michael Schulz, Holger Fritze, et al. "Examinations of high-temperature properties of stoichiometric lithium niobate." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-186802.

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24

Scott, Jeffrey Gordon. "Laser-assisted surface and domain microstructuring of lithium niobate." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/30235/.

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This thesis presents the results of investigations into the nano-structuring of lithium niobate using the combined or sequential action of laser light and a chemical etch (a mixture of hydrofluoric and nitric acids). Novel methods to characterise ferroelectric domains using Raman spectroscopy and surface second harmonic generation are also described. The use of Raman spectroscopy as a diagnostic technique for recently poled lithium niobate was investigated. The position of several Raman peaks were observed to be shifted following electric-field domain inversion; some these peaks returned to th
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25

Jones, Julian Kelly. "Diffusively doped thulium- and ytterbium-lithium niobate waveguide lasers." Thesis, University of Southampton, 1995. https://eprints.soton.ac.uk/399106/.

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This thesis describes the work carried out on diffusively doped Tm - and Yb - Ti:LiNbO3 waveguide lasers. During the course of this investigation the fabrication, spectroscopy, and laser characterisation of the resulting devices was performed. Rare earth doping was accomplished using the thermal indiffusion technique, which is a highly flexible method for doping this very useful optical material. This study produced the first Yb:LiNbO3 laser, and the first room temperature Tm:LiNbO3 laser. Also the first detailed spectroscopy of Yb:LiNbO3 was performed here. Laser emission was seen in a Yb:LiN
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26

Swanson, Claudia H., Michael Schulz, Holger Fritze, et al. "Examinations of high-temperature properties of stoichiometric lithium niobate." Diffusion fundamentals 12 (2010) 48, 2010. https://ul.qucosa.de/id/qucosa%3A13886.

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27

Nutt, Alan C. G. "Techniques for fabricating integrated optical components on lithium niobate." Thesis, University of Glasgow, 1985. http://theses.gla.ac.uk/7969/.

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28

Chen, Bo Xu Chang-Qing. "All-optical quasi-phase-matched lithium niobate wavelength converters." *McMaster only, 2006.

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29

Manzo, Michele. "Engineering ferroelectric domains and charge transport by proton exchange in lithium niobate." Doctoral thesis, KTH, Kvantelektronik och -optik, QEO, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-162269.

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Ferroelectrics are dielectric materials possessing a switchable spontaneous polarization, which have attracted a growing interest for a broad variety of applications such as ferroelectric lithography, artificial photosynthesis, random and dynamic access memories (FeRAMs and DRAM), but also for the fabrication of devices for nonlinear optics, etc. All the aforementioned applications rely on the control of the ferroelectric domains arrangement, or the charge distribution and transport. In this regard, the main prerequisite is the engineering of the spontaneous polarization, obtained by reversing
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30

Barety, Jean-Philippe. "Génération du second harmonique dans des guides d'ondes réalisés par échange protonique dans le Niobate de Lithium." Nice, 1986. http://www.theses.fr/1986NICE4018.

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Ce mémoire présente les résultats récents concernant d'une part la réalisation de structures de guidage fiables dans le Niobate de Lithium par la technique d'échange protonique ; d'autre part, l'utilisation de telles structures pour des expériences de génération du second harmonique utilisant le coefficient d33 du Niobate de Lithium
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31

Chirila, Madalina M. "Characterization of point defects in nonlinear optical materials." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=3287.

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Thesis (Ph. D.)--West Virginia University, 2003.<br>Title from document title page. Document formatted into pages; contains xi, 125 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 121-125).
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32

Mhaouech, Imed. "Étude du transport de charges dans le niobate de lithium massif et réalisation de fonctions électro-optiques dans le niobate de lithium périodiquement polarisé." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0032/document.

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Le premier volet de cette thèse est consacré à la modélisation des phénomènes de transport dans le LN. Partant d'une analyse critique des modèles de bande usuels, nous montrons leur inadéquation dans le cas du LN et nous proposons un modèle de saut basé sur la théorie des petits polarons. Nous étudions d'abord par simulation Monte-Carlo la décroissance d'une population de polarons liés NbLi4+ relaxant vers des pièges profonds FeLi3+. Nous montrons que les pièges FeLi3+ ont des rayons effectifs particulièrement grands, rayons qui augmentent encore à température décroissante, et limitent considé
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33

Majkić, Aleksej. "Electro-optically tunable microring resonators in fluorine-implanted lithium niobate /." Zürich : ETH, 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18179.

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34

Grisard, Arnaud. "Lasers guides d'onde dans le niobate de lithium dopé erbium." Phd thesis, Université de Nice Sophia-Antipolis, 1997. http://tel.archives-ouvertes.fr/tel-00089120.

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Le niobate de lithium dopé à l'erbium permet de tirer parti des propriétés optiques des ions terre rare et du fort coefficient électro-optique de la matrice. Il constitue ainsi un matériau prometteur pour la réalisation de lasers déclenchés monolithiques émettant vers 1,5 µm. En configuration guidée, l'obtention d'impulsions à forte puissance crête est en particulier envisageable à partir d'un pompage par diode laser du commerce et avec de faibles tensions de commande.<br />Dans cette perspective, un mécanisme prépondérant de réduction du gain aux fortes concentrations de dopant, caractéristiq
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35

Nguyen, Giang Thach, and thach nguyen@rmit edu au. "Efficient Resonantly Enhanced Mach-Zehnder Optical Modulator on Lithium Niobate." RMIT University. Electrical and Computer Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070118.162330.

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Photonic links have been proposed to transport radio frequency (RF) signals over optical fiber. External optical modulation is commonly used in high performance RF-photonic links. The practical use of optical fiber to transport RF signals is still limited due to high RF signal loss. In order to reduce the RF signal loss, highly efficient modulators are needed. For many applications, modulators with broad bandwidths are required. However, there are applications that require only a narrow bandwidth. For these narrow-band applications, the modulation efficiency can be improved through the resonan
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36

Schmarje, Nicole. "Lithium niobate piezocomposites for high temperature applications in nondestructive testing." Thesis, University of the West of Scotland, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427710.

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37

Manzo, Michele. "Influence of selective proton exchange on periodically poled lithium niobate." Thesis, KTH, Kvantelektronik och -optik, QEO, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-164586.

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The purpose of the present thesis is to study the influence of Proton Exchange on Electric Field assisted Poling of congruent Lithium Niobate and its applications on periodically pat-terned structures. Moreover, the possibility of using Proton Exchange to avoid neighbours domains merging is studied and successfully demonstrated for period shorter than 10μm. Before approaching the poling of periodically patterned LiNbO3 samples, the main charac-teristics of the evolution of the poling of uniform samples in different masking conditions are investigated. It is well known that the kinetics of doma
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38

Loni, Armando. "An experimental study of proton-exchanged lithium niobate optical waveguides." Thesis, University of Glasgow, 1987. http://theses.gla.ac.uk/1586/.

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The object of this thesis is to form an understanding of the origin of the problems associated with proton-exchanged waveguides, and to investigate possible solutions. Chapter 1 gives a brief introduction to the properties of lithium niobate, and discusses the methods available for fabricating optical waveguides in the bulk material, with particular emphasis on waveguide fabrication by the proton-exchange process. Some of the devices which have been fabricated by proton-exchange are discussed. The problems associated with proton-exchanged waveguides are reviewed. Chapter 2 deals with the physi
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39

Mills, P. A. "Volume holographic infra-red filters in iron doped lithium niobate." Thesis, University of Oxford, 1985. http://ora.ox.ac.uk/objects/uuid:01d6f3ab-692e-40a5-9f60-d67ebee96bd7.

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Two collimated laser beams, wavelength O-514 μm are overlapped within a crystal of heavily iron doped lithium niobate to form a one-dimensional volume holographic grating, a few mm long, designed to behave as a highly selective filter at near infra-red wavelengths. A novel recording geometry is described and a variety of diagnostic experiments are undertaken to determine the main characteristics of the grating. A filter fabricated using this method is used to obtain single mode operation from a 1-55 μm semiconductor laser. The historical survey of holography contained in chapter one emphasizes
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40

Her, Jyh-Yan, and 何志元. "Optical Waveguides on Lithium Niobate." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/33304367893351979992.

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碩士<br>國立成功大學<br>電機工程研究所<br>82<br>In recent years, due to the improvements of the techno- logies of optical fiber and semiconductor laser technology, the integrated optics has been widely used in many applica- tion fields. Lithium Niobate with its novel electro-optic effect was employed as the optical modulation material in integrated optics. In order to transfer optical wave, the waveguide is fabricate in the Lithium Niobate by two differ- ent method: proton exchange and titanium indiffusi
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41

Chen, Chieh-Ting, and 陳玠廷. "Waveguide Faricaiton on Lithium Niobate and Third-harmonic Generation in Periodically Poled Lithium Niobate Waveguides." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/26061756428781090844.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>90<br>In this thesis, we report the fabrication of channel waveguides on LiNbO3 and PPLN. The second harmonic generation and third harmonic generation in such waveguides are also discussed. Here, two methods were used for waveguide fabrication. One was the annealed proton exchange (APE) method with benzoic acid melt and the other was the proton exchange vapor (PEV) method with benzoic acid vapor. The characteristics of the waveguides showed the dependencies on guiding width, proton exchange time, annealing time and wavelength. With these two methods, single-mode and
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42

Merola, Francesco. "Lithium Niobate: optical properties and applications." Tesi di dottorato, 2009. http://www.fedoa.unina.it/3785/1/Merola.pdf.

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43

Rost, Timothy Alan. "A thin film lithium niobate ferroelectric transistor." Thesis, 1991. http://hdl.handle.net/1911/16480.

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The incorporation of a thin film of LiNbO$\sb3$ in a conventional MOS (metal-oxide-semiconductor) structure gives the possibility of two fundamentally different types of computer memory architectures. One, based on ferroelectric switching, involves the reorganization of charge in the transistor channel to compensate for the change in surface polarization. Another, based on the bulk photovoltaic effect, creates a change in the threshold of the transistor when exposed to incident light. With the use of a molybdenum liftoff process, such ferroelectric transistors have been realized. The propertie
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44

Lee, Bing-heng, and 李秉衡. "Fabrication of Local Periodically Poled Lithium Niobate." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/q39284.

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碩士<br>國立臺北科技大學<br>光電工程系研究所<br>98<br>The processing methods for local periodically poled x-cut and z-cut lithium niobate are studied in this thesis. Local periodically poled structures are produced on lithium niobate by applying a voltage on the periodical electrodes located on the ridge. The effects of process parameters on the domain inversion results are also discussed. For the local periodically poling on x-cut lithium niobate, inductive coupled plasma etching technology is utilized to form the ridge structure. The characteristics of inductive coupled plasma etching technology are described
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Fan, Chih-Bin, and 范智彬. "Fabrication of Microdisk Resonator on Lithium Niobate." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/thpv92.

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碩士<br>國立臺北科技大學<br>光電工程系研究所<br>99<br>This thesis on the research of micro-disk resonator on lithium niobate with under-cut structure. With its horizontal and vertical high refractive index contrast, making it a more effective limitation of the light field in order to reduce light transmission caused by the loss.Under-cut structure is fabricated by using ion implantation and wet etching techniques to achieve, the process produced a specific pattern on lithium niobate. The chromium film and photoresist are used to wet etching and ion implantation mask respectively.By using helium ion implantation
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46

Gill, Douglas Max. "Incorporation and characterization of erbium in lithium niobate." 1994. http://catalog.hathitrust.org/api/volumes/oclc/32383886.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1994.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 102-103).
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47

Yang, Shih-Yuan, and 楊詩遠. "Electro-Optic Aperiodically Poled Lithium Niobate Directional Couplers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/22142818802512809288.

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碩士<br>國立中央大學<br>光電科學與工程學系<br>105<br>In this study, we have used simulated annealing method to calculate the aperiodic domain inversion structure in LiNbO3 crystal. Moreover, we have applied this kind of structure on the electro-optically directional coupler. With the aperiodically poled LiNbO3 directional coupler (APPLNDC), it made the difference coupling result with periodically poled LiNbO3 directional coupler (PPLNDC). According to the difference arrangement of the poling structure, the directional coupler can get the difference coupling result, and thus APPLNDC can be more adjustable. In t
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48

Chang, Wen-Che, and 張文哲. "Fabrication of Under-Cutting Structures on Lithium Niobate." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/2xc7v8.

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碩士<br>國立臺北科技大學<br>光電工程系研究所<br>98<br>Waveguide devices with under-cutting structure on lithium niobate are produced in this thesis. By means of high index contrast of the under-cutting structure in the lateral and vertical directions, the propagating optical field can be effectively confined and the propagation loss of the curve waveguide with small radius is reduced. Under-cutting structure is formed by using ion-implantation and wet-etching techniques. In the experiments, chromium and photoresist are used as wet-etching mask and ion-implantation mask, respectively. He+ ion implantation is uti
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49

Li, Zhen Hong, and 李鎮宏. "A study of improved lithium niobate optical waveguides." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/43834755996730835644.

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Chang, Ren Woei, and 張人偉. "Crystal Growth and Raman Spectra of Lithium Niobate." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/84591035940179272256.

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