Dissertations / Theses on the topic 'Optical parametric oscillation'
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Fragemann, Anna. "Optical parametric amplification with periodically poled KTiOPO4." Doctoral thesis, KTH, Laserfysik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-531.
Full textQC 20101013
Fragemann, Anna. "Optical parametric amplification with periodically poled KTiOPO4." Doctoral thesis, KTH, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-531.
Full textThis thesis explores the use of engineered nonlinear crystals from the KTiOPO4 (KTP) family as the gain material in optical parametric amplifiers (OPAs), with the aim to achieve more knowledge about the benefits and limitations of these devices. The work aims further at extending the possible applications of OPAs by constructing and investigating several efficient and well performing amplifiers.
An OPA consists of a strong pump source, which transfers its energy to a weak seed beam while propagating through a nonlinear crystal. The crystals employed in this work are members of the KTP family, which are attractive due to their large nonlinear coefficients, high resistance to damage and wide transparency range. The flexibility of OPAs with respect to different wavelength regions and pulse regimes was examined by employing various dissimilar seed and pump sources.
The possibility to adapt an OPA to a specific pump and seed wavelength and achieve efficient energy conversion between the beams, originates from quasi-phasematching, which is achieved in periodically poled (PP) nonlinear crystals. Quasi-phasematched samples can be obtained by changing the position of certain atoms in a ferroelectric crystal and thereby reversing the spontaneous polarisation.
In this thesis several material properties of PP crystals from the KTP family were examined. The wavelength and temperature dispersion of the refractive index were determined for PP RbTiOPO4, which is essential for future use of this material. Another experiment helped to increase the insight into the volumes close to domain walls in PP crystals
Further, several OPAs were built and their ability to efficiently amplify the seed beam without changing its spectral or spatial properties was studied. Small signal gains of up to 55 dB and conversion efficiencies of more than 35 % were achieved for single pass arrangements employing 8 mm long PPKTP crystals. Apart from constructing three setups, which generated powerful nanosecond, picosecond and femtosecond pulses, the possibility to amplify broadband signals was investigated. An increase of the OPA bandwidth by a factor of approximately three was achieved in a noncollinear configuration.
Lewandowski, Przemyslaw, Samuel M. H. Luk, Chris K. P. Chan, P. T. Leung, N. H. Kwong, Rolf Binder, and Stefan Schumacher. "Directional optical switching and transistor functionality using optical parametric oscillation in a spinor polariton fluid." OPTICAL SOC AMER, 2017. http://hdl.handle.net/10150/626462.
Full textGuy, Andrew. "Synchronously pumped optical parametric oscillation in barium borate and potassium titanyl phosphate." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/404356/.
Full textLam, Ping Koy, and Ping Lam@anu edu au. "Applications of Quantum Electro-Optic Control and Squeezed Light." The Australian National University. Faculty of Science, 1999. http://thesis.anu.edu.au./public/adt-ANU20030611.170800.
Full textLafont, Ombline. "Analysis and control of polarization effects in structured semiconductor microcavities." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEE035/document.
Full textSemiconductor microcavities with embedded quantum wells in the strong light-matter coupling regime host quasi-particles called microcavity exciton-polaritons. Their hybrid nature, half-electronic, half-photonic, brings about remarkable nonlinear optical properties. In this work, we focus on microcavities that are structured to enable the coexistence of polaritonic branches with various symmetries and energies. First, a microcavity etched to form micrometers-wide wires is studied. The lateral confinement lifts the degeneracy between the modes which are polarized parallel and orthogonal to the wire direction. We show that this splitting results from built-in constraints which make a precise engineering of the splitting magnitude possible. We then focus on a double microcavity. In the elastic Rayleigh scattering regime, the TE-TM splitting induces a spatial and angular separation of polaritons with different pseudospins. We show that this phenomenon, called "Optical Spin Hall Effect", can be controlled by a strong optical pump beam. In the regime of Optical Parametric Oscillation, the light self-organizes to form patterns in the far field. The selection rules for the orientation and polarization of these patterns are explored in the regime of Optical Parametric Amplification. These studies pave the way for the realization of microscopic "lighthouse" devices (able to continuously orientate the light by a simple polarization control) and ultrafast all-optical switches
Feaver, Ryan K. "Cascaded Orientation-Patterned Gallium Arsenide Optical Parametric Oscillator for Improved Longwave Infrared Conversion Efficiency." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493206535730182.
Full textHewitt, Sarah Elaine. "Dynamics and stability of periodic spatial patterns in the optical parametric oscillator /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6777.
Full textCui, Yong. "UV pumped holosteric optical parametric oscillator." Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/14889.
Full textFeaver, Ryan K. "Longwave-Infrared Optical Parametric Oscillator in Orientation-Patterned Gallium Arsenide." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324048074.
Full textBernard, Alice. "Towards an electrically-injected optical parametric oscillator." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC104/document.
Full textThe work presented in this thesis deals with the design, fabrication and characterization of sources intended to function as both laser diodes and optical parametric oscillators. These lasers are designed to emit on a higher order mode to allow parametric frequency conversion with fundamental modes of the guide at half frequency. The laser diode and OPO share the same optical cavity; to ensure phase matching and correct nominal structure deviations induced during epitaxial processing, the ridge width is used as a control parameter of the effective indices. The proposed diodes are therefore narrow (3-5 μm) and etched deeply. Consequently, it is potentially interesting to use quantum dots to limit non-radiative recombination on the sidewalls. In the context of this work, we have designed diodes based on this principle for the two GaAs/AlGaAs and InGaAsP/InP systems, which respectively allow to potentially obtain an OPO emission in the vicinity of 2 μm or 3 μm. In the case of InGaAsP/InP, we previously studied the refractive index of InGaAsP alloys in a wavelength range not covered by literature to this day. This data was acquired via effective m-line index measurements of InGaAsP guiding layers epitaxially grown on and lattice-matched to an InP substrate. For optimized laser-OPO structures, simulations show that the OPO threshold should be obtained for an intracavity pump power of a few hundred mW, which is realistic to achieve for state-of-the-art laser diodes. We have studied the electro-optical properties of GaAs/AlGaAs quantum well laser diodes made on the basis of our designs; the observation of the laser effect on the TE2 mode validates the original vertical design of our laser diodes. For the manufacture of narrow-ridge lasers-OPOs, we have developed new manufacturing processes on the Plateforme Technologique Amont (Upstream Technology Platform, CEA - Grenoble), including deep etching (> 10 μm) by ICP-RIE. Finally, we have proposed an alternative diode-OPO concept, comprising distinct laser and OPO cavities coupled by an adiabatic taper
Lyons, Sean Christopher. "Numerical modelling of a nanosecond optical parametric oscillator." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248729.
Full textBromley, Leigh John. "Development of the synchronously pumped optical parametric oscillator." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/404739/.
Full textTiihonen, Mikael. "Spectral Management in Quasi-Phase-Matched Parametric Devices." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4021.
Full textCollar, A. J. "Differential absorption lidar using an optical parametric oscillator source." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370334.
Full textGonzales, Ureta Junior Ricardo. "Orbital angular momentum in an driven optical parametric oscillator." Master's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/11975.
Full textThe control of the Orbital Angular Momentum (OAM) of light in quantum optical system can provide an additional degree of freedom, that can enable many applications in quantum mechanics and optical communications. Lasers beams with OAM (optical vortices) are generally described by Laguerre-Gaussian modes, which have a doughnut intensity distribution with phase singularities in the wavefront. In the special case of first order OAM modes, the Poincaré sphere gives a convenient geometrical representation of those optical vortices. Following the theoretical proposal done by B.Coutinho dos Santos et. al in 2007, in this project we are interested in studying experimentally the dynamics of an Optical Parametric Oscillator under the injection of a seed beam with OAM. The main aim of this project is to characterize the OAM conservation in the twin beams, namely signal and idler, coming from the injected Optical Parametric Oscillator, according to the symmetry in the Poincaré sphere. We aim also at studying theoretically the dynamics of the twin beams generated, according to the real experimental parameters of the setup, to improve the twin beams creation efficiency, which will enable us to study experimentally quantum entanglement in this apparatus. Also, in the scope of this work, the measurements and characterization of squeezing was performed in the recent mounted OPO at UFF.
Tesis
Balskus, Karolis. "Versatile femtosecond optical parametric oscillator frequency combs for metrology." Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3198.
Full textArciniegas, Carlos Andres Gonzalez. "Properties of the light emitted by a silicon on-chip optical parametric oscillator (OPO)." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-22112017-153330/.
Full textO oscilador paramétrico ótico (OPO) tem sido uma fonte muito versátil de estados não clássicos da luz. A configuração usual destes OPOs consiste em um cristal macroscópico com não linearidade de segunda ordem no interior de uma cavidade ótica. Recentemente, devido ao desenvolvimento da fotonica de silício, foi possível a implementação de micro- cavidades óticas e OPOs que possuem varias vantagens sobre OPOs usuais. Não entanto a não linearidade destes sistemas é de terceira ordem. Neste trabalho, descrevemos teoricamente as propriedades quânticas da luz gerada num OPO com não linearidade de terceira ordem. Mostra-se que os efeitos de modulação de fase (não presentes na não linearidade de segunda ordem) e a dispersão são determinantes para a geração e o emaranhamento produzido no sistema. Emaranhamento bi e tri partito foi predito teoricamente usando o formalismo de modos de Schmidt. Também foi feita uma descrição quando mais modos da cavidade são excitados gerando um pente de frequência. Nesta situação. e utilizando novamente o formalismo de modos de Schmidt, foi predito emaranhamento multimodo destes sistemas.
Jacobsson, Björn. "Spectral control of lasers and optical parametric oscillators with volume Bragg gratings." Doctoral thesis, KTH, Laserfysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4691.
Full textThe object of this thesis is to explore the usage of reflective volume Bragg gratings in photo-thermo-refractive glass for spectral control of solid-state lasers and optical parametric oscillators, to build tunable and narrowband coherent light-sources. In order to provide a design tool for use of reflective volume Bragg gratings in laser cavities, a theory was developed that describes the performance of the gratings if the incident beam has finite width with an angular spectrum that is comparable to the grating's angular acceptance bandwidth. Spectral control was demonstrated in a number of cw solid-state lasers, in terms of narrow bandwidth and tunable wavelength, by use of a volume Bragg grating. The design could be made very simple by replacing one of the cavity mirrors with the grating. Thanks to the grating's strong spectral selectivity, the lasers could be locked anywhere in the gain spectrum, while the laser bandwidth was substantially narrowed. In particular, the following lasers were demonstrated: Single-longitudinal-mode lasing in ErYb:glass at 1553 nm with 90 kHz linewidth and in Nd:GdVO4 at 1066 nm with a linewidth below 40 MHz. Very low quantum defect in Yb:KYW lasers, diode-pumped at 982 nm and lasing at 998 nm with 10 GHz bandwidth, as well as Ti:sapphire-pumped at 980 nm and lasing at 990 nm. An Yb:KYW laser that was widely tunable from 996 nm to 1048 nm with 10 GHz bandwidth. In nanosecond pulsed optical parametric oscillators (OPOs) based on periodically poled KTiOPO4, narrowband operation and a tunable wavelength were demonstrated with a volume Bragg grating as a cavity mirror. At a signal wavelength of 975 nm, the bandwidth was 50 GHz, a reduction by 20 times compared to using a conventional mirror. A tuning range of 21 THz was also demonstrated. In another OPO at a signal wavelength of 760 nm, a ring-cavity design was demonstrated to provide convenient tuning. A tuning range of 2.6 THz and a bandwidth of 130 GHz was shown. Also, narrowband operation and tuning in an OPO around 1 µm was demonstrated by use of a transversely chirped Bragg grating.
QC 20100813
Fragemann, Anna. "Quasi-Phasematched nonlinear processes in KTiOPO4 isomorphs." Licentiate thesis, KTH, Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1716.
Full textThis thesis explores the use of nonlinear crystals from theKTiOPO4(KTP) family with the aim to extend the possibleapplications for laser sources and to gain more knowledge aboutthe materials benefits and limits. The work focussed onoptical parametric oscillators (OPOs) and optical parametricamplifiers (OPAs), which employ second order nonlinearprocesses. Both devices transfer energy from a laser beam at aparticular wavelength to a different wavelength, which istuneable. In OPOs two new beams at different wavelengths aregenerated, whereas in OPAs an existing weak beam is amplified.The essential part of these devices, which enables theoccurrence of the energy conversion, is a nonlinear crystal. Inthis work the ferroelectric crystals KTP and RbTiOPO4(RTP) have been utilized.
By modifying the materials structure,quasi-phasematching can be obtained, which is a crucialrequirement for achieving efficient energy conversion betweenthe incident and the generated waves. The fabrication ofquasi-phasematched crystals is dependent on the controlledreversion of the materials spontaneous polarisation,which is accomplished by periodic electric field poling.
Nanosecond pulses of more than 200 kW were generated in theeye-saferegion by employing a double pass OPA.Small signal gains exceeding 75 dB were obtained for anessentially diffraction limited beamwithout spectralbroadening of the seed. By subsequent signal coupling intofibres substantial broadening was accomplished. A systematicmeasurement series of several RTP crystals allowed us toaccurately determine the wavelength and temperature dispersionof the refractive index, which are two essential requirementsfor further employment of this material. The OPOs based on RTPwere widely tuneable by controlling the temperature. It wasalso concluded that RTP behaves similar to KTP in parametricdevices, thus being a material, which can sustain high powers,possesses large nonlinear coefficients and can operate in abroad wavelength region.Efficient Raman oscillation concurrent with parametricoscillation was observed and analysed in several KTP samples.This gave further insight into the processes taking placeinside the material when performing as a frequency converter,if the generated idler lies in the absorption band.This thesis also covers the investigation of afemtosecond optical parametric chirped pulse amplifier.Temporally stretched seed pulses were amplified to 85 µJ,resulting in a gain above 60 dB, and subsequent recompressionresulted in 270 fs pulses.
Keywords:nonlinear optics, KTiOPO4, optical parametric oscillator, optical parametricamplifier, RbTiOPO4, quasi-phasematching, electric field poling,stimulated Raman scattering.
Andrade, Rayssa Bruzaca de. "An optical parametric oscillator for a light- atomic media interface." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-18062018-052437/.
Full textNesse trabalho apresentamos uma descrição das propriedades quânticas dos feixes de luz produzidos por um Oscilador Paramétrico Ótico (OPO) acima do limiar, bombeado por um laser de Titânio Safira com comprimento de onda de 780nm, linha D2 do Rb, com espectro de ruído de um feixe coerente. Os feixes gêmeos possuem comprimentos de onda na região de 1560 nm que compreende a janela de transmissão de fibras óticas. Os estados emitidos pelo OPO em estudo são aproximadamente gaussianos (1), o que nos permite descrevê-los em termos de momentos de primeira e segunda ordem. Como analisamos o espectro de ruído das flutuações de cada feixe, os momentos de primeira ordem são nulos, o que nos permite descrever o estado do sistema em termos de uma matriz de covariância. Apresentamos então o comportamento do espectro de ruído e das correlações entre os feixes de bombeio refletido, sinal e complementar. Ademais, aplicamos diferentes critérios de emaranhamento para estudar o sistema. Apresentamos uma previsão do emaranhamento bipartido utilizando o critério de Duan (2). Para as correlações tripartidas, utilizamos o critério de Furusawa (3). Realizamos um estudo da bipartição bombeio e quadratura soma. E, aplicamos o critério PPT para variáveis contínuas (4), transpondo independente cada feixe em estudo. O critério PPT é necessário e suficiente para demonstrar emaranhamento entre bipartições para estados gaussianos. Com o objetivo de explorar qual o comportamento do sistema frente ao critério de \"steering\" no modelo desenvolvido por Reid (5), estudamos teoricamente o critério de inferência para quadraturas bipartidas: entre os feixes gêmeos ou entre um dos feixes gêmeos e o feixe de bombeio. Finalizamos essa análise caracterizando a inferência entre os três modos, através da bipartição modo do bombeio e combinação das quadraturas soma dos feixes gêmeos. Apresentamos a formulação de um protocolo de teletransporte quântico de um estado coerente de entrada formado pelo feixe do Titânio Safira, cuja medida de Bell é realizada utilizando o bombeio refletido pelo OPO como estado emaranhado para os feixes sinal e complementar, como uma primeira possibilidade de implementar o protocolo. Também propomos um protocolo em que o feixe sinal auxilia no processo de teleportação. Dessa forma, a fidelidade do sistema aumenta e supera o limite da não clonagem. Descreveremos as primeiras medidas de correlações entre os feixes emitidos pelo OPO para esse sistema. A caracterização de emaranhamento tripartido nessa nova configuração é o primeiro passo para a implementação de protocolos de ótica quântica utilizando uma fonte de estados emaranhados que é compatível tanto com sistemas atômicos de Rubídio quanto com a região de telecomunicações, formando assim uma rede quântica de transferência e aprisionamento de informação.
Teja, Joseph. "Intensity noise correlation in a triply resonant optical parametric oscillator." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43393.
Full textIncludes bibliographical references (leaves 183-186).
by Joseph Teja, Jr.
M.S.
McCracken, Richard A. "Femtosecond optical parametric oscillator frequency combs for coherent pulse synthesis." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2702.
Full textTerry, Jonathan A. C. "An all-solid-state optical parametric oscillator for the infrared." Thesis, University of St Andrews, 1994. http://hdl.handle.net/10023/15032.
Full textSinclair, Scott. "Pattern formation and control of spatial structures in optical parametric oscillators." Thesis, University of Strathclyde, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249142.
Full textPredojevic, Ana. "Rubidium resonant squeezed light from a diode-pumped optical-parametric oscillator." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/6592.
Full textde la luz comprimida en una colectividad de átomos exige que la luz (comprimida) sea resonante a la línea espectral de absorción. El láser de diodo
puede acceder a una amplia clase de líneas espectrales dado al amplio rango de longitudes de onda accesibles. Por lo tanto, el uso de fuentes de luz comprimida basadas en láseres de diodo ampliaría el número de los posibles experimentos. Además, los láseres de diodo reúnen muchas buenas
características como son su construcción robusta y compacta, simplicidad y bajo precio. La única desventaja de los láseres diodo es el ruido de la fase que resulta en un ensanchamiento de sus líneas espectrales.
Esta tesis describe estudios experimentales y teóricos de generación de estados de luz omprimida en cuadratura y polarización, adecuados para la
interacción con átomos de rubidio. En ese ocumento damos una atención especial al ruido de fase y sus efectos en el grado de compresión de la luz
y los métodos para lograr luz comprimida en presencia de ruido de fase generado en el láser de diodo.
La tesis está estructurada de la siguiente manera:
El primer capítulo presenta las ideas generales de la conversión paramétrica de frecuencia (parametric downconversion) en un oscilador paramétrico
óptico. Aquí derivamos la descripción teórica de la luz comprimida en un oscilador paramétrico óptico operado por debajo del nivel umbral.
El segundo capítulo describe el aparato experimental. Primero, damos una descripción detallada del diseño de la cavidad paramétrica óptica y
resumimos las propiedades del cristal no lineal. A continuación, pasamos a describir el láser y los sistemas usados para la estabilización del sistema
láser y de la cavidad del oscilador. En el tercero se discute la ganancia de amplificación y la eficiencia de detección. Por último damos una descripción
general del experimento y presentamos los resultados en la compresión cuántica ("squeezing") de la luz.
El último capítulo analiza los efectos de ruido de fase en el "squeezing" de cuadratura y describe una técnica para eliminar su efecto. Primero,
discutimos el origen del ruido de fase para sistemas de láser de diodo. Segundo, derivamos el grado observable de "squeezing", teniendo en cuenta
los efectos de fluctuaciones cuasi-estacionarias de frecuencia. Por último, mostramos cómo los efectos del ruido de fase pueden ser eliminados y
comparamos la predicción teórica con nuestros resultados experimentales.
El resultado de este proyecto es una fuente de luz no-clásica resonante con la transición atómica del rubidio. Caracterizamos el "squeezing" del estado
de vacío cuántico resultante. El máximo grado de compresión logrado en el experimento fue 2.5dB por debajo del nivel de ruido cuántico. Además
realizamos un análisis del efecto que el ruido de fase tiene en el grado de compresión. Los resultados de este análisis mostraron que en presencia de
ruido de fase se espera que el "squeezing" dependa del retardo relativo entre el haz de luz comprimida y el oscilador local. Comprobamos
experimentalmente esta hipótesis y medimos el grado de compresión como una función del retardo entre la luz comprimida y el oscilador local. Los
resultados experimentales obtenidos fueron consistentes con la teoría.
Aparte de construir una fuente luz comprimida resonante con rubidio, hemos probado que el láser de diodo es una fuente adecuada para la producción
de luz comprimida. Hemos proporcionado una teoría que trata el efecto de ruido de fase en el grado de compresión de la luz en un oscilador
paramétrico óptico. El aparato experimental presentado aquí utiliza técnicas estándar que podrían ser aplicadas a una variedad de otras longitudes de ondas.
This thesis describes experimental and theoretical studies of generation of quadrature- and polarization-squeezed light suitable for interaction with rubidium atoms. Special attention is paid to phase noise, its effects on squeezing, and methods to achieve squeezing in the presence of diode laser phase noise.
Squeezed light is an important component of quantum memories experiments. Efficient storage of (squeezed) light in atomic ensembles requires the
light to be resonant to the respective atomic transition. Diode lasers can access many atomic transitions as they cover significantly broader wavelength
range than other classes of lasers. Consequently, employing diode-laser-based squeezed light sources would broaden the range of possible quantum
memories experiments. Furthermore, diode lasers posses many attractive features like robustness, simplicity, compactness, and low price. The
drawback of the diode laser is it's excess phase noise, which results in a relatively large linewidth. This forms an obstacle for detection of phasesensitive quantum states such as quadrature squeezing.
The thesis is structured as follows:
The first chapter presents the general ideas on parametric downconversion in an optical parametric oscillator. Here we derive the theoretical description
of squeezing of the light field in a subthreshold optical parametric oscillator.
The second chapter describes the experimental apparatus. First, we give a detailed description of the design of the optical parametric oscillator cavity
and summarise the properties of the nonlinear crystal. In continuation, we describe the laser system and the locking systems used for the laser system
and the optical parametric oscillator cavity stabilisations. Third, we discuss the amplification gain and the detection efficiency. Finally, we give a full
overview of the experiment and we present the squeezing results.
The last chapter analyses the effects of phase noise on quadrature squeezing and describes a technique to eliminate its effect. First, we discuss the
origin of the phase noise for diode laser systems. Second, we derive the observable squeezing taking into account the effects of quasi-static frequency
fluctuations. Third, we show how the effects of the phase noise can be eliminated and, last but not least, we compare the theoretical prediction with our
experimental results.
The outcome of this project is a rubidium resonant source of non-classical light. We characterised the output squeezed vacuum state. The maximum
squeezing achieved in the experiment was 2.5dB below shot-noise level. Moreover, we performed an analysis of the effect the phase noise has on the
squeezing. The results of this analysis showed that in presence of phase noise we expected that the squeezing level would depend on the relative
delay between squeezing and local oscillator path. We experimentally tested this statement performing a measurement of squeezing as a function of
the delay between the squeezed light and the local oscillator. The experimental results were consistent with the theory.
Apart form building a source of rubidium resonant squeezed light we have proven that the diode laser is a source suitable for production of squeezed
light. We provided a theory which treats the effect of phase noise on squeezing in optical parametric oscillator.
The experimental squeezing apparatus presented here uses standard techniques which could be applied to a variety of other wavelengths.
McCarthy, Matthew John. "Investigation of an all solid state synchronously pumped optical parametric oscillator." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386664.
Full textNaz, Naveed A. "Investigation into mid-infrared pulse shaping using an optical parametric oscillator." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/54050/.
Full textKurti, R. Steven Jr. "Pulse Compression in a Mid-infrared Synchronously Pumped Optical Parametric Oscillator." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1106235646.
Full textNoble, Jeffrey Scott, and Jeffrey Scott Noble. "Laser Gyroscope based on Synchronously Pumped Bidirectional Fiber Optical Parametric Oscillator." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625701.
Full textWilliams, J. F. "The optical parametric oscillator, saturating blow-up in the large detuning limit." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ61515.pdf.
Full textMason, Elliott J. (Elliot James) 1972. "Selp-phase locking in a type-II phase matched optical parametric oscillator." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38804.
Full textIncludes bibliographical references (leaves 55-56).
by Elliott J. Mason, III.
M.Eng.
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.
Full textPatterson, Steven Gregory. "Quantum intensity noise correlation in a Type-II phase matched optical parametric oscillator." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36977.
Full textIncludes bibliographical references (p. 104-105).
by Steven Gregory Patterson.
M.S.
Ferreiro, Teresa I. "Development and characterisation of a near-infrared femtosecond optical parametric oscillator frequency comb." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2802.
Full textVillar, Alessandro de Sousa. "\"Estudo de emaranhamento no oscilador paramétrico ótico não-degenerado acima do limiar\"." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-05062007-140157/.
Full textSqueezing in the intensity difference of signal and idler beams generated by an OPO operating above threshold was observed some time ago and presented one of the major attraction of this system. Entanglement between the macroscopic fields, however, has not yet been demonstrated in normal operation conditions above threshold (non-degenerate beams). Using a non-separability criterion for continuous variables, we investigate whether the variances of a pair of EPR-like operators, difference of intensities and sum of phases of signal and idler, can violate a Bell-type inequality and hence characterize entanglement. After a theoretical study, we verified that entanglement can occur in an experimentally accessible region of parameters. This measurement was not performed to date owing to the difficulty of measuring the phase quadratures, which usually requires the use of local oscillators with slightly different frequencies. Motivated by this, we propose an experimental setup that uses optical cavities to rotate the noise ellipse of each beam, projecting phase noise into intensity noise, thus allowing the experimental access to the phase quadratures. We preliminarly implemented our proposal and obtained promising although not conclusive results, that indicate entanglement.
Butterworth, Stuart David. "Investigations of a high power all-solid-state synchronously-pumped lithium triborate optical parametric oscillator." Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394570/.
Full textMarsden, Philip Andrew. "Investigation of narrow-band semiconductor quantum well structures using a synchronously-pumped optical parametric oscillator." Thesis, University of Southampton, 2001. https://eprints.soton.ac.uk/30239/.
Full textKovalchuk, Evgeny. "Optical parametric oscillators for precision IR spectroscopy and metrology." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15759.
Full textThis thesis presents a continuous-wave optical parametric oscillator (cw OPO), specially developed for high-resolution Doppler-free molecular spectroscopy and metrology. The basic objective was to solve the long-standing problem of controlled access to any desired wavelength in the wide emission range of OPOs, including the ability to precisely tune the output frequency over the molecular and atomic transitions of interest. The system implemented during this work fully achieves these goals and its performance was demonstrated in various measurements and applications. For this aim, a new design for the OPO cavity with an intracavity etalon was implemented, extending the concept of a cw singly resonant OPO with resonated pump wave. The newly developed device demonstrates very good long-term stability and spectral properties, which were determined in direct beat frequency measurements with a methane infrared optical frequency standard. Thus, an idler radiation linewidth of 12 kHz and mode-hop-free operation of the OPO over several days were observed. Furthermore, it was shown that an OPO can be phase locked to a highly stable optical reference and thus much more precisely controlled and tuned. As the first successful application of OPOs in Doppler-free spectroscopy, a frequency modulation spectroscopy setup for detection of sub-Doppler resonances in methane was implemented. Furthermore, the developed cw OPO was integrated with a femtosecond optical frequency comb to realize a new concept for a coherent link between the visible and infrared spectral ranges. As a first demonstration of this technique, a direct absolute frequency comparison between an iodine stabilized laser at 532 nm and a methane stabilized laser at 3390 nm was performed.
Ahlrichs, Andreas. "Triply-Resonant Cavity-Enhanced Spontaneous Parametric Down-Conversion." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20150.
Full textThe consistent generation of single photons with well-defined properties in all degrees of freedom is crucial for the development of photonic quantum technologies. Today, the most prominent sources of single photons are based on the process of spontaneous parametric down-conversion (SPDC) where a pump photon spontaneously decays into a pair of signal and idler photons inside a nonlinear medium. Cavity-enhanced SPDC, i.e., placing the nonlinear medium inside an optical cavity, is widely used to build photon-pair sources with increased brightness and tailored spectral properties. This spectral tailoring by selective adjustment of the cavity parameters is of particular importance for hybrid quantum technologies which seek to combine dissimilar quantum systems in a way that their advantages complement each other. This thesis provides a comprehensive theoretical and experimental analysis of triply-resonant cavity-enhanced SPDC. We improve the theoretical model found in the literature such that the influence of all resonator properties on the important experimental parameters (e.g., the generation rate) can be analyzed in detail. This convenient and highly accurate model of cavity-enhanced SPDC represents an important basis for the design and optimization of novel photonpair sources. The experimental part of this thesis presents the setup and characterization of a triply-resonant photon-pair source. We describe the digital control system used to operate this source over days without manual intervention, and we present a highly stable, narrow-linewidth monochromator based on cascaded, polarization-independent monolithic Fabry-Pérot cavities. Utilizing these temperature-stabilized cavities as a spectrum analyzer, we verify, for the first time, the frequency comb spectral structure of photons generated by cavity-enhanced SPDC. We further simulate and measure the impact of the pump resonance on the temporal wave-packets and the two-photon interference of signal and idler photons. Finally, we present a series of experiments in the context of hybrid quantum networks where we employ quantum frequency conversion (QFC) to transfer the generated signal photons into the telecommunication band. We verify the preservation of the temporal wave-packet upon QFC and highlight how quantum networks can benefit from advanced commercial telecommunication technologies.
Nery, Marina Trad 1987. "Oscilador paramétrico óptico contínuo e unicamente ressonante no infravermelho próximo." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277010.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Esta tese reporta o projeto e a construção de um oscilador paramétrico óptico continuo de frequência unica e sintonizável em torno de 846 nm. 0 cristal responsável pela conversão de frequências e o MgO:PPSLT (Tantalato de Lftio periodicamente polado e dopado com 1% de Oxido de Magnésia), e este e bombeado por ate 6 W de um laser continuo emitindo em 532 nm. Um dos objetivos do experimento e a geração de segundo harmônica, a partir de luz infravermelha, resultando em radiação na região espectral do azul, mais ,precisamente em 423 nm, necessária para experimentos de aprisionamento e resfriamento de átomos neutros de Cálcio. Para isso foi montada uma cavidade em anel unicamente ressonante para o feixe sinal e foi observada oscilação do dispositivo em uma potencia limiar próxima de 5 W, mais alta do que o calculada previamente. Foi possível observar a emissão de 30 m W de radiação do feixe sinal o que representa uma potencia de 30 W dentro da cavidade, ja que o espelho de saída era 99,9% refletor. Também foi possível observar luz azul devido a geração de segundo harmônica (sem Casamento de fase) dentro do cristal PPSLT. Ao longo deste trabalho são apresentados cálculos detalhados da cavidade óptica, das curvas de sintonia do cristal por temperatura e periodicidade da grade e do ganho paramétrico óptico. Acreditamos que o alto limiar de oscilação do dispositivo esteja relacionado a perdas devidas ao efeito fotorrefrativo no cristal, produzido pelo laser de bombeio, já que as perdas da cavidade devido aos espelhos e ao cristal eram baixas. Esta hipótese deve ser melhor investigada em futuras implementação de OPOs bombeados por altas potencias na região espectral do visível
Abstract: This thesis reports the design and construction of an continuously tunable and single frequency optical parametric oscillator around 846 nm. The crystal responsible for the frequency conversion is MgO: PPSLT (periodically poled lithium tantalate doped 1% of magnesium oxide), pumped with up to 6 W by a continuous-wave laser emitting at 532 nm. One goal of the experiment is the second harmonic generation from infrared light, resulting in radiation in the blue spectral region, more precisely 423 nm, necessary for experiments of cooling and trapping of neutral calcium atoms. A ring cavity resonant only for the signal beam was mounted and oscillation has been observed with a threshold of 5 W, higher than previously calculated. It was observed 30 mW ofradiation from the signal representing an intracavity power of 30 W, given the output coupler reflectivity of 99.9% reflector. We also observed blue light due to second harmonic generation (without phase matching) within the crystal PPSLT. Throughout this work we present detailed calculations of the optical cavity, temperature tuning curves for the crystal period of the poling grate and the optical parametric gain. We believe that the observed high threshold is related to losses due to the photorefractive effect in the crystal produced by the pump laser, since other losses due to the cavity mirrors and the crystal were very low. This hypothesis should be further investigated in future implementations of OPOs pumped by high powers in the visible spectral region
Mestrado
Física
Mestra em Física
Capelle, Thibault. "Electromechanical cooling and parametric amplification of an ultrahigh-Q mechanical oscillator." Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUS045.
Full textIn this thesis, we have studied an ultrahigh quality factor mechanical oscillator coupled to a microwave cavity. We will present an original technique to probe the losses of planar microwave cavities, as well as a resolved sideband cooling technique to actively cool this mechanical oscillator using the microwave cavity. Finally, we will present some optimizations of this experiment which open the path towards the ground state cooling of the mechanical oscillator. Such a hybrid quantum system could be used as an on-chip quantum memory, able to store fragile quantum states generated by superconducting quantum circuits for coherence times approaching a second
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.
Full textAndrade, Rayssa Bruzaca de. "Construção de um oscilador paramétrico ótico para uma interface átomo-luz." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26092014-100545/.
Full textAt the present work we conducted the construction of a triply resonant Optical Parametric Oscillator pumped by a Titanium-Sapphire laser, which is tunable between 730 nm to 800 nm. The emitted beams have wavelength around 1560 nm, in the optical fibers transmission window, maximum output of 420 mW and minimum oscillation threshold of 53(3) mW. For the twin beams, the cavity finesse is F=155 mW and the intracavity losses are 0.05(0.10)%, allowing, in principle, a noise compression close to 97(5)%. The present OPO was built having the purpose of being used as source of triply entangled states in a system for quantum information storage and transfer, while interacting with an atomic rubidium system. We measured the power threshold and conversion efficiency for each pump beam wavelength that we used to characterize the system.
Voß, Daniel [Verfasser], Hartmut [Gutachter] Roskos, and John [Gutachter] Sheridan. "Investigations on terahertz imaging with pulsed optical parametric oscillator radiation and heterodyne Fourier techniques / Daniel Voß ; Gutachter: Hartmut Roskos, John Sheridan." Frankfurt am Main : Universitätsbibliothek Johann Christian Senckenberg, 2019. http://d-nb.info/1184986185/34.
Full textBrasil, Túlio Brito. "Caracterização clássica e quântica de um oscilador paramétrico ótico bombeado em 780 nm." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-25042016-233058/.
Full textIn this dissertation, we will describe the first measurements of quantum noise in an optical parametric oscillator (OPO) pumped at 780 nm, built at our laboratory. This OPO will be the source of nonclassical states of light to interact with rubidium atoms. We will review the classical OPO theory: the pumping of a nonlinear crystal inside a cavity producing two bright light beams (signal and idler) with different colors. We will calculate the power threshold, output power of the converted beams and compare the main differences between type-I and type-II OPO.We will analyze the quantum description of the OPO, and calculate the noise spectrum of the reflected pump quadratures and for the twin beams quadratures. We will observe that the OPO generates beams with quantum correlations, for example, the tripartite entanglement among the three fields involved in the nonlinear phenomena. The nonlinear crystal used in our experiment is a PPKTP type-I. By adjusting the temperature of the crystal, we can generate beams from close to degenerate regime to a difference between them of 350 nm. The squeezing of quantum noise measured in the amplitude quadratures subtraction for signal and idler is 44%(-2.5 dB). The next step is to implement the method of ellipse noise rotation by an optical cavity, to be able to measure phase quadratures of the three different fields. By verifying the tripartite entanglement and determining the phonon noise due to the crystal, our source characterization will be complete. The characterization of this OPO is an important step in LMCAL goals, which is to realize exchange of information between light and atoms in a quantum network.
Armougom, Julie. "Nouvelles sources optiques pour la détection d’espèces chimiques dans la bande III." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT077/document.
Full textLaser spectrometry by differential absorption is a well-known technique for standoff detection of chemical species in the atmosphere. The longwave infrared region (LWIR), ranging from 8 to 12 µm is particularly interesting because the absorption bands of many chemical species are intense and non-overlapping. In order to detect those species in the LWIR, there is a need for sources that are spectrally narrow, widely tunable, and delivers high energies. The sources based on second order nonlinear optics are the only technology able to meet those requirements. In this work, we will present the experimental results on two parametric architectures that allows emission in the LWIR for lidar measurements. The first one consists in emitting a beam directly in the LWIR by pumping nonlinear crystals with 2 µm pump lasers. The second architecture consists in amplifying the signal and idler beams coming from a 2 µm OPO, before converting them into the LWIR by difference frequency generation. Those sources are based on the association of new technologies and have the potential to offer a viable solution to a lack of sources emitting in the LWIR
Coelho, Antonio Sales Oliveira. "Emaranhamento multicor para redes de informação quântica." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20052014-105215/.
Full textWe present in this thesis the first direct generation of tripartite entanglement among bright beams of light. We measured the entanglement among signal, idler and reflected pump beams, produced by an Optical Parametric Oscillator (OPO) operating above the threshold. The main feature of our system is the difference between the wavelengths of the fields (l0 = 532.251 nm, l1 = 1062.102 nm, e l2 = 1066.915 nm). This is the first measurement of entanglement among more than two subsystems produced by a single source, in a continuous variable system. In order to investigate the existence of entanglement, we applied the criterion of positivity under partial transposition (PPT). This criterion, applied to systems composed of Gaussian states, arranged in 1×(N1) bipartition, becomes necessary and sufficient to demonstrate entanglement. We also characterized the entanglement when the fields are submitted to losses, identifying regions of parameters where the states have fragile or robust entanglement. To ensure that we are dealing with Gaussian states, we investigate the statistics of the fields, showing excelent agreement among values of higher order moments of the photocurrent measured and expected values for a Gaussian distribution. The present study is an important step in the development of a quantum information network formed by different physical systems.
Mei, Jialin, Kai Zhong, Maorong Wang, Pengxiang Liu, Degang Xu, Yuye Wang, Wei Shi, Jianquan Yao, Robert A. Norwood, and Nasser Peyghambarian. "Compact high-repetition-rate terahertz source based on difference frequency generation from an efficient 2-μm dual-wavelength KTP OPO." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622890.
Full textCassemiro, Katiuscia Nadyne. "Correlações quânticas multicolores no oscilador paramétrico ótico." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-11062008-153347/.
Full textWe have investigated the collective quantum properties of the three bright light beams produced by an optical parametric oscillator (OPO) operating above threshold, named pump, signal, and idler. We have analyzed experimentally their intensity and phase quantum fluctuations, and how they are correlated. For the first time, we have observed the existence of phase quantum correlations among the three beams. The measured phase-sum noise between signal and idler, Vq12=1,28(3)>1, presents squeezing when corrected by the phase fluctuations of the pump beam, resulting in (Vq12)\'=0,84(3)<1. For higher pump powers, we have observed the existence of amplitude quantum correlations directly between pump and one of the downconverted beams (signal or idler); the maximum measured squeezing level corresponded to the noise Vp02=0,86(3)<1. Our investigations included the entanglement properties of this tripartite system, tested by two different criteria. Our data points to the separability of the system in the accessible regime of operation, in contradiction with the theoretical predictions. Applying the criterion by P. van Loock and A. Furusawa, we have obtained the following values of combinations of variances which would attest the inseparability in case values smaller than 2 would be obtained: V0=1,29(5)<2, V1=2,04(11)>2, and V2=2,09(7)>2. For the second criterion, the positivity under partial transpose, we have obtained the following symplectic eigenvalues calculated from the measured covariance matrix: A0=0,94(8) and A1=0,36(6)<1, where entanglement is attested in case A0<1,and A1<1. This discrepancy with the theoretical prediction is caused by a classical spurious noise observed in the system, which characteristics are investigated in this thesis. Our analysis indicates the path to successfully observe tripartite entanglement. We show theoretically that the predicted tripartite entanglement can be employed as a resource for the construction of a multipartite entangled system. This is accomplished by pumping several OPO\'s with the same optical field, such that the pump beam reflected by the first OPO is utilized to pump a second one, and so on. This scheme allows the generation of a multicolor scalable quantum network. Finally, we describe the construction of a Ti:sapphire laser which represents the first step in the integration between non-classical light and atomic physics to be investigated in our laboratory. This laser could be employed at the same time to pump an OPO and to interact with a cloud of atoms. The tripartite entanglement produced by the OPO could then entangle the atoms to the downconverted beams, which wavelength would allow the transmission of these beams through commercial optical fibers for telecom.