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Tesis sobre el tema "Terahertz, Spectroscopy, Nonlinear Optics"

Autor: Grafiati

Publicado: 10 de marzo de 2023

Última modificación: 31 de julio de 2025

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1

Peter, F. "Advanced emitters and detectors for terahertz time-domain spectroscopy." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-61479.

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The idea of terahertz-time-domain spectroscopy (THz-TDS) is to exploit a single cycle, spectrally broad THz radiation pulse to gain insight into the response of matter. Photoconductive devices and nonlinear crystals are utilized in both the generation as well as the coherent detection of THz radiation. The relatively high cost and the complexity of commonly used titanium-sapphire lasers hinder a more widespread use of pulsed THz systems for commercial applications. Er-doped femtosecond fiber lasers operating at 1.55 μm could offer a viable alternative. In this thesis nonlinear crystals and pho

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2

Rasekh, Payman. "Kerr Effect at the THz Frequencies." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41085.

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This doctoral dissertation focuses on the nonlinear optical response of water vapour as well as some solids at terahertz (THz) frequencies. In this study, the propagation of broadband single-cycle THz pulses through a medium with the third-order nonlinear optical response is theoretically investigated. Also, a technique to measure the nonlinear response of transparent materials based on the time-domain THz spectroscopy is developed, which provides frequency dispersion curves of the nonlinear Kerr coefficient (n₂). A numerical model is used to simulate the THz pulse propagation. This model tak

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3

Bernerd, Cyril. "Génération d'ondes TeraHertz par Différence de Fréquence." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT061/document.

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Le domaine des ondes TeraHertz (THz) s’étend de l’infrarouge lointain (15 μm / 20 THz) aux ondes radios (3000 μm / 0.1 THz). La couverture spectrale des sources actuelles, qu’elles soient thermique (lampes à mercure…), électronique (diode Gunn…) ou optique (laser, antennes…), ne permet pas de répondre à l’ensemble des applications en spectroscopie et en imagerie. Une alternative à ces sources est l’optique non linéaire paramétrique, qui permet de générer des ondes THz à partir du processus de Différence de Fréquences (DFG), et qui consiste à injecter un ou deux lasers dans un cristal non linéa

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4

Abdul, Hadi Zeinab. "Terahertz emission spectroscopy of multiferroic bismuth ferrite : insights into ultrafast currents and phonon dynamics." Electronic Thesis or Diss., Le Mans, 2024. http://www.theses.fr/2024LEMA1030.

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La technologie térahertz (THz) a suscité un intérêt significatif dans la communauté scientifique en raison de sa position unique dans le spectre électromagnétique, complétant le gap entre les régions des micro-ondes et de l'infrarouge. Cette radiation est non ionisante et peut pénétrer divers matériaux sans les endommager, ce qui la rend très attirante pour de nombreuses applications potentielles. Les avancées récentes dans la technologie des lasers ultra-rapides ont élargi l'exploration du rayonnement THz à un large éventail de technologies passionnantes. Elle est désormais utilisée dans des

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5

Nguyen, Alisée. "Contrôle de rayonnements térahertz intenses produits par lasers femtosecondes et applications à la détection de molécules." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS020/document.

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Les ondes térahertz (THz), situées entre l'infrarouge et les micro-ondes dans le spectre électromagnétique, correspondent aux fréquences caractéristiques de nombreux mouvements moléculaires et permettent ainsi de caractériser des molécules complexes par spectroscopie dans le domaine temporel. Cette thèse a pour objectif d'étudier les champs THz émis par une source constituée d'une impulsion laser à deux couleurs générant un plasma par ionisation de l'air. En raison de l'asymétrie temporelle du champ laser, un courant électronique présentant une composante basse-fréquence dans la gamme THz est

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6

Singh, Rohit. "Modulated orientation sensitive terahertz spectroscopy." Thesis, State University of New York at Buffalo, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3565883.

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<p> The energies of protein correlated motions lie in the far infrared or THz frequency range (λ = 1 cm – 50 mm, f = 0.03 – 6 THz). The existence of correlated motions has been confirmed by neutron and inelastic x-ray scattering measurements. These techniques require large sample volumes and specialized facilities, limiting their application to systematic studies of changes in correlated motions with functional state and allosteric interactions. Standard terahertz time domain spectroscopy measurements have shown sensitivity to protein-ligand binding, oxidation state, conform

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7

Brandt, Nathaniel Curran. "Developments and advances in nonlinear terahertz spectroscopy." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91110.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Nonlinear terahertz (THz) spectroscopy is a rapidly developing field, which is concerned with driving and observing nonlinear material responses in the THz range of the electromagnetic spectrum. In this thesis, I present several advances in nonlinear THz spectroscopy that expand the range of systems in which responses may be driven, the types of responses that may be initiated, and the way in which these responses may be obser

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8

Kühn, Wilhelm. "Nonlinear terahertz spectroscopy in one and two dimensions." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16286.

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Die vorliegende Dissertation behandelt Grundlagen und Anwendungen der nichtlinearen Terahertzspektrospie (THz). Diese Arbeit zeigt erstmalig, dass sich die Inversion des Quantenkaskadenlasers nach einer Störung schon innerhalb von hundert Femtosekunden wieder erholt. Außerdem wurde der exakte Generationsprozess von THz Impulsen in einem Laser-induzierten zwei-Farben Plasma untersucht. Durch Vergleich mit Simulationen wird eindeutig der Ionisationsstrom im Plasma als Quelle der THz Strahlung identifiziert. Neue Spektroskopiemethoden in ein und zwei Zeitdimensionen werden entwickelt und auf vers

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9

Ould-Hamouda, Amine. "Étude des transitions de phase photo-induites dans des matériaux métalliques et organométalliques." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0112/document.

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Ces travaux de thèse portent sur l'étude des transitions de phases photo-induites dans différents matériaux métalliques et organométalliques. Les études présentées ont été guidées par la problématique liée à l'enregistrement et au stockage d'informations numériques. Tout d’abord, nous nous sommes intéressés à la spectroscopie THz et Raman de composés à transitions d'état de spin à base de Fe (II). Les spectres obtenus à l’aide de ces deux techniques sont confrontés aux résultats issus de simulations numériques (DFT). Nous avons également étudié la transition d’état de spin induite par des lase

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10

Graber, Benjamin. "HIGH POWER TIME DOMAIN TERAHERTZ SPECTROSCOPY." Diss., Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/301211.

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Physics<br>Ph.D.<br>Terahertz (THz) has become a strong area for scientific research and commercial application in recent years. This research group has redesigned and optimized a THz photoconductive antenna, which currently operates with approximately 10x the power of a commercial antenna. It has been determined by this research that the THz signal emitted from a photoconductive antenna consists of coherent and incoherent signals. In addition to the improvement of the THz photoconductive antenna, I have optimized an electro optic THz detection system by characterizing the field dependency of

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11

Yeh, Ka-Lo. "The generation of high field terahertz radiation and its application in terahertz nonlinear spectroscopy." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/49748.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2009.<br>Includes bibliographical references (p. 147-155).<br>In this thesis research, I implemented a terahertz generation scheme that enables high-field near-single-cycle terahertz (THz) pulse generation via optical rectification in a LiNbO3 (LN) crystal. I also developed a method for the non reconfigurable generation of high-intensity multiple-cycle THz fields aimed to more efficiently deliver THz energy to resonant samples. A novel free-space THz-pump/THz-probe setup enabled time-resolved measurement of ultrafast n

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12

Jones, Samuel Peter Philip. "Magneto-optics of complex oxides at terahertz frequencies." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:c3d53c3c-d51a-417c-894a-fcb9681f1447.

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This thesis presents experimental results on two complex oxide systems: Cu<sub>1-x</sub>Zn<sub>x</sub>O and La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub>:ZnO. The dynamic magnetoelectric response of these materials is obtained using terahertz time-domain spectroscopy, supported by Fourier-transform infrared spectroscopy, Raman spectroscopy and X-ray diffraction. Evidence for an electromagnon in the multiferroic phase of CuO is presented for the first time. This high temperature (213-230K) electromagnon is linked to intersublattice exchange between two Cu sublattices. The temperature dependen

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13

Knighton, Brittany E. "Nonlinear Ultrafast Excitation and Two-Dimensional Terahertz Spectroscopy of Solids." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9190.

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Ultrafast spectroscopy allows us to probe and understand material properties. With it, we can measure phonon-polaritons (optical phonons coupled with light) and the resulting dispersion curve in lithium niobate. Customizing the excitation source in ultrafast measurements can excite phonon modes to large amplitudes, allowing the experimental exploration of the Potential Energy Surface in solids. However, stronger pump fluences and bigger signal isn't always the answer in ultrafast spectroscopy. When sample signals and their nonlinear and mechanisms cannot be distinguished with 1D measurements,

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14

Wang, Yichao. "Terahertz nonlinear optical response of armchair graphene nanoribbons." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2163.

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It has become increasingly apparent that the future of next generation of electronic devices can and will rely on graphene nanoribbons. Graphene nanoribbons and sister structures showcase several key properties that can address the emerging need of terahertz science and technology, and break through the many technological limits on conventional semiconductor electronics operating in the terahertz spectrum. In this thesis, we focus on the study of the terahertz nonlinear optical response of metallic armchair graphene nanoribbons and si

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15

Hwang, Harold Young. "Nonlinear terahertz spectroscopy of electronic and vibrational responses in condensed matter systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/73174.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references.<br>In this work, I describe experiments utilizing high-field terahertz (THz) pulses to initiate nonlinear responses in several classes of materials. We have developed several methods for interrogating the nonlinear THz response of materials including collinear and nonc

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16

Xia, Chen. "Terahertz Time-Domain Spectroscopy of Low-Dimensional Materials and Photonic Structures." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1355168322.

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17

Polyutov, Sergey. "Electron-nuclear Dynamics in Nonlinear Optics and X-ray spectroscopy." Doctoral thesis, Stockholm : Bioteknologi, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4339.

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18

Folland, Thomas. "Frequency control of terahertz quantum cascade lasers : theory and measurement." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/frequency-control-of-terahertz-quantum-cascade-lasers-theory-and-measurement(d4c55769-f053-4b79-aed3-e2fec575adde).html.

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Terahertz (THz) technology stands to solve a number of problems in everyday life, from next generation wireless communication to spectroscopic identification and imaging. However it is technically challenging to make a high power, compact source for terahertz radiation. The Quantum Cascade Laser (QCL), which produces gain at THz frequencies by exploiting inter-sub-band transitions in quantum wells, offers one solution to this problem. However controlling and detecting the emission from such sources remains a major challenge. This thesis investigates the theory and measurement of emission frequ

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19

Jasper, Evan. "Development of Techniques in Time Domain Terahertz Spectroscopy for the Study of Chiral and Topological Materials." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1597048083501651.

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20

Liu, Ji-Cai. "Dynamics of multiphoton processes in nonlinear optics and x-ray spectroscopy." Doctoral thesis, KTH, Teoretisk kemi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11394.

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New generations of ultrashort and intense laser pulses as well ashigh power synchrotron radiation sources and x-ray free electronlasers have promoted fast developments in nonlinear optics andx-ray spectroscopy.The new experimental achievements and the appearance of varieties of novelnonlinear phenomena call for further development of theories. The objective of this thesis is to develop and apply thetheories to explain existing experimental data and to suggest new experiments. The first part of the thesis is devoted to nonlinear propagation of optical pulses. It is shown that the vibrational le

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21

Kühn, Wilhelm [Verfasser], Elsässer [Akademischer Betreuer], Hamm [Akademischer Betreuer], and Masselink [Akademischer Betreuer]. "Nonlinear terahertz spectroscopy in one and two dimensions / Wilhelm Kühn. Gutachter: Elsässer ; Hamm ; Masselink." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://d-nb.info/1015016944/34.

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22

Lim, Daeyoung. "Nonlinear optical spectroscopy of silicon-boron and other silicon-adsorbate systems." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3034931.

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23

Metbulut, Mukaddes Meliz. "Development Of Compact Terahertz Time-domain Terahertz Spectrometer Using Electro-optic Detection Method." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610983/index.pdf.

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The goal of this thesis is to describe development of compact terahertz time-domain spectrometer driven by a mode-locked Ti:Sapphire laser. The terahertz radiation was generated by photoconductive antenna method and detected by electro-optic detection method. In this thesis, several terahertz generation and detection method, working principle of terahertz time-domain spectroscopy and its applications are discussed. We mainly focused on working principle of terahertz time-domain spectroscopy and characterization of detected terahertz power using electro-optic detection method.

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24

McGuckin, Brendan T. "Linear and nonlinear optical spectroscopy of semiconductors using opticallypumped lasers." Thesis, Heriot-Watt University, 1985. http://hdl.handle.net/10399/1655.

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25

Barlow, Aaron M. "Spectral Distortions & Enhancements In Coherent Anti-Stokes Raman Scattering Hyperspectroscopy." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32388.

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Coherent anti-Stokes Raman scattering microscopy is a versatile technique for label-free imaging and spectroscopy of systems of biophysical interest. Due to the coherent nature of the generated signals, CARS images and spectra can often be difficult to interpret. In this thesis, we document how distortions and enhancements can be produced in CARS hyperspectroscopy as a result of the instrument, geometrical optical effects, or unique molecular states, and discuss how these effects may be suppressed or exploited in various CARS applications.

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26

Valley, John Francis. "Nonlinear optical experiments in sodium vapor and comparison with Doppler-broadened two-level-atom theory." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184930.

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Two spectral regions of gain exist for a weak probe beam propagating through a medium of two-level-atoms pumped by a strong near-resonance field. Experimentally a cw ring-dye laser is used to explore this gain at the Na D₂ resonance in a vapor. Plane-wave calculations of probe-gain spectra which include the Doppler broadening inherent in a vapor agree well with experimental spectra obtained with a Fabry-Perot interferometer. Such two-beam-coupling gain might have applications as optical pre- or power amplifiers. The gain is also the primary step in four-wave-mixing. Mixing of the pump and side

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27

Грідякіна, Олександра Валеріївна, and Аркадій Петрович Поліщук. "Nonlinear-optical recording in ionic liquid crystalline medium." Thesis, Physikzentrum in Bad Honnef, 2017. http://er.nau.edu.ua/handle/NAU/32390.

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28

Odhner, Johanan. "INVESTIGATIONS OF TEMPORAL RESHAPING DURING FILAMENTARY PROPAGATION WITH APPLICATION TO IMPULSIVE RAMAN SPECTROSCOPY." Diss., Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/196129.

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Chemistry<br>Ph.D.<br>Femtosecond laser filamentation in gaseous media is a new source of broadband, ultrashort radiation that has the potential for application to many fields of research. In this dissertation filamentation is studied with a view to understanding the underlying physics governing the formation and propagation dynamics of filamentation, as well as to developing a method for vibrational spectroscopy based on the filament-induced impulsive vibrational excitation of molecules in the filamentation region. In pursuit of a better understanding of the underlying physical processes driv

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29

Hu, Zhen Kimble H. Jeff Kimble H. Jeff. "Quantum optics with cold atoms--nonlinear spectroscopy and road toward single-atom trap /." Diss., Pasadena, Calif. : California Institute of Technology, 1995. http://resolver.caltech.edu/CaltechETD:etd-10112007-092812.

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30

Folpini, Giulia. "Exploring Nonresonant Interactions in Condensed Matter by Two-Dimensional Terahertz Spectroscopy." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/18860.

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Zur Untersuchung nichtlinearer Reaktionen von kondensierten Materie-Systemen wird die multidimensionale Terahertz-Spektroskopie genutzt. Ein mehrere Oktaven umfassende THz-Quelle, die auf der Frequenzmischung in organischen Kristallen basiert, wird entwickelt und zur Erforschung der Librationsbande von Wasser-Nanotröpfchen in DOPC-Micellen verwendet. Die nichtresonante THz-Strahlung wird genutzt, um die Emission im mittleren Infrarotbereich eines Intersubband-Übergangs von GaAs-Quantentöpfen kohärent zu steuern. Schließlich wird die 2D-THz-Spektroskopie verwendet, um die nichtlineare Antwor

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31

Govani, Jayesh R. "Spectroscopic characterizations of organic/inorganic nanocomposites." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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32

Sinha, Raju. "Tunable, Room Temperature THz Emitters Based on Nonlinear Photonics." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3172.

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The Terahertz (1012 Hz) region of the electromagnetic spectrum covers the frequency range from roughly 300 GHz to 10 THz, which is in between the microwave and infrared regimes. The increasing interest in the development of ultra-compact, tunable room temperature Terahertz (THz) emitters with wide-range tunability has stimulated in-depth studies of different mechanisms of THz generation in the past decade due to its various potential applications such as biomedical diagnosis, security screening, chemical identification, life sciences and very high speed wireless communication. Despite the trem

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33

Robertson, John Michael. "Nonlinear optical properties of absorbing molecular systems." Thesis, University of Essex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390961.

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34

Бордюг, Ганна Борисівна, and Аркадій Петрович Поліщук. "Fast photoconversion in viologen-doped lyotropic ionic liquid crystals." Thesis, Physikzentrum in Bad Honnef, 2017. http://er.nau.edu.ua/handle/NAU/32391.

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35

Liang, Qijun [Verfasser]. "Terahertz Time-Domain Spectroscopy : Characterization of Nonlinear Crystals, Nanowires, 2D Gratings,Organic Liquids, and Polystyrene Particles / Qijun Liang." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/1110772335/34.

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36

Leigh, Matthew. "HIGH POWER PULSED FIBER LASER SOURCES AND THEIR USE IN TERAHERTZ GENERATION&#8194." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193797.

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In this dissertation I report the development of high power pulsed fiber laser systems. These systems utilize phosphate glass fiber for active elements, instead of the industry-standard silica fiber. Because the phosphate glass allows for much higher doping of rare-earth ions than silica fibers, much shorter phosphate fibers can be used to achieve the same gain as longer silica fibers.This single-frequency laser technology was used to develop an all-fiber actively Q-switched fiber lasers. A short cavity is used to create large spacing between longitudinal modes. Using this method, we demon

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37

Turksen, Zeynep. "Applications In Broadband Thz Spectroscopy Towards Material Studies." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612908/index.pdf.

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The purpose of this work was to construct and analyze a THz time domain spectroscopy (THz-TDS) system by using a nanojoule energy per pulse ultrafast laser (non-amplified ultrafast laser or oscillator) source and a non-linear optical generation method for THz generation. First a THz-TDS system, which uses photoconductive antenna (PCA) method for THz generation, was built to understand the working principles of these types of systems. This THz-TDS system which used PCA for generation and a 2mm thick &lt<br>110&gt<br>ZnTe crystal for detection had a bandwidth up to 1 THz with a 1000:1 signal to

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38

Грідякіна, Олександра Валеріївна, and Ганна Борисівна Бордюг. "Nonlinear helical winding in highly viscous chiral thin films." Thesis, NANO-2017, 2017. http://er.nau.edu.ua/handle/NAU/32389.

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39

Herman, Gregory S. "Terahertz Local Oscillator Via Difference Frequency Generation in III-V Semiconductors Using Frequency Stabilized Lasers." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/306995.

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Terahertz (THz) heterodyne receiver systems are required by NASA to monitor gas concentrations related to the Earth's ozone depletion. To this end, NASA needs compact, solid state, tunable THz local oscillators. THz LOs have been developed using three means: 1) All-electronic LOs using mixers in combination with Gunn oscillators, 2) Hybrid Photo-electronic LOs using a cw analog of the Auston switch, and 3) All-photonic THz LOs using coherent sources, such as vapor lasers or solid-state Quantum Cascade Lasers, and down converting lasers using nonlinear crystals. In this dissertation, we beg

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40

Kimberg, Victor. "Pulse Propagation in Nonlinear Media and Photonic Crystals." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3886.

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41

Fu, Jie. "Molecular Structure-Nonlinear Optical Property Relationships for a Series of Polymethine and Squaraine Molecules." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3941.

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This dissertation reports on the investigation of the relationships between molecular structure and two-photon absorption (2PA) properties for a series of polymethine and squaraine molecules. Current and emerging applications exploiting the quadratic dependence upon laser intensity, such as two-photon fluorescence imaging, three-dimensional microfabrication, optical data storage and optical limiting, have motivated researchers to find novel materials exhibiting strong 2PA. Organic materials are promising candidates because their linear and nonlinear optical properties can be optimized for appl

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42

Averett, Shawn C. "Advancements in the Understanding of Nonlinear Optics and Their Use in Material Analysis." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6507.

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Adhesion, heterogeneous catalysis, electrochemistry, and many other important processes and properties are driven by interactions at surfaces and interfaces. Vibrational sum frequency generation spectroscopy (VSFG) is an increasingly popular analytical technique because it can provide information about the nature and physical orientation of functional groups at these surfaces and interfaces. Analysis of VSFG data can be complicated by the presence of SFG signal that is not associated with a resonant vibration. This nonresonant sum frequency generation (NR-SFG) signal can interfere with the res

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43

Olszak, Peter D. "Nonlinear absorption and free carrier recombination in direct gap semiconductors." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4620.

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Nonlinear absorption of Indium Antimonide (InSb) has been studied for many years, yet due to the complexity of absorption mechanisms and experimental difficulties in the infrared, this is still a subject of research. Although measurements have been made in the past, a consistent model that worked for both picosecond and nanosecond pulse widths had not been demonstrated. In this project, temperature dependent two-photon (2PA) and free carrier absorption (FCA) spectra of InSb are measured using femtosecond, picosecond, and nanosecond IR sources. The 2PA spectrum is measured at room temperature w

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44

Ford, William Paul. "Development of a Fourier Transform Far Infrared (FTFIR) Spectrometer to Characterize Broadband Transmission Properties of Common Materials in the Terahertz Region." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1158508606.

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45

Shah, Anjali. "External cavity diode lasers and non-linear optical frequency conversion in spectroscopic applications." Thesis, St Andrews, 2006. http://hdl.handle.net/10023/142.

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46

Peceli, Davorin. "Absorptive and Refractive Optical Nonlinearities in Organic Molecules and Semiconductors." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5687.

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The main purpose of this dissertation to investigate photophysical properties, third order nonlinearity and free carrier absorption and refraction in organic materials and semiconductors. Special emphasis of this dissertation is on characterization techniques of molecules with enhanced intersystem crossing rate and study of different approaches of increasing triplet quantum yield in organic molecules. Both linear and nonlinear characterization methods are described. Linear spectroscopic characterization includes absorption, fluorescence, quantum yield, anisotropy, and singlet-oxygen generati

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47

Delmonte, Valentin. "Spectroscopie cohérente des excitons dans des nanostructures semi-conductrices innovantes." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY015/document.

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L'évolution des technologies liées aux semi-conducteurs a amené à l'étude de la cohérence des Bits Quantiques (Qbits) dans l'objectif de réduction de la taille des composants. A l'aide de la spectroscopie cohérente non-linéaire, j'ai pu étudier les propriétés de cohérences des excitons confinés dans des boites quantiques (BQ), eux-même intégrées dans différentes nano-structures. L'intérêt des nano-structures est d'augmenter le ratio signal-sur-bruit, indispensable dans notre expérience. L'utilisation des nano-structures est aussi indispensable dans l'objectif de la mise en place d'un couplage

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48

Thomson, Caroline L. "Study of phase-matching geometries in bulk and periodically-poled lithium niobate and their use in intracavity terahertz optical parametric oscillators." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3024.

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This thesis describes the experimental implementation of novel intersecting cavity terahertz optical parametric oscillators based on bulk and periodically-poled magnesium oxide-doped lithium niobate. Both collinear and non-collinear phase-matching geometries have been demonstrated and injection-seeding has been implemented in devices using periodically-poled material to reduce threshold and increase the down-conversion efficiency. A comprehensive characterisation of the original intracavity terahertz OPO was undertaken, which revealed the parameters having the greatest impact on OPO efficiency

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49

Johnson, Magnus. "Vibrational Sum Frequency and Infrared Reflection/Absorption Spectroscopy Studies of the Air/Liquid and Liquid/Metal Interfaces." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-455.

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50

Поліщук, Аркадій Петрович, Олександра Валеріївна Грідякіна, and Ганна Борисівна Бордюг. "Matrix effec on the electrooptical properties of heptylviologen." Thesis, XXIII ISSSMC, 2017. http://er.nau.edu.ua/handle/NAU/32388.

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