Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"ppln"”.
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All-optical signal processing using cascaded quadratic interactions in periodically poled lithium niobate waveguides
… in periodically poled lithium niobate (PPLN) waveguides for telecommunication applications. PPLN waveguides which possess high second-order nonlinearity are attractive due to their suitable properties with respect to high compactness, high operating speed and resistance to parasitic …
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Novel devices in periodically poled lithium niobate
… 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. <br/><br/>The fabrication of PPLN devices is described and extensive studies into factors influencing the …
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Fabrication and applications of zinc indiffused waveguides in periodically poled lithium niobate
… in periodically poled lithium niobate (PPLN) is reported in this thesis. The thesis covers all stages from the production of PPLN by domain inversion on a micron scale through to optical testing. The factors affecting poling quality, such as crystal discrepancies from different …
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Generation of fiber-coupled, nondegenerate, polarization-entangled photons for quantum communication
… periodically-poled, congruent lithium niobate (PPLN). Difference frequency generation of 798 nm is used for characterizing PPLN, including phase matching bandwidth and effective nonlinear coefficient. Optimal focusing for generating a single spatial mode SPDC output allows efficient coupling of …
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Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources
… based on periodically poled lithium niobate (PPLN) and pumped at 1060nm from the first pump source are demonstrated. With 20ps-long pump pulses, average powers of up to 7.3W (3.1W) for the signal (idler) are generated at variable repetition rates of ~0.1 . . . 1GHz. With longer 100ps pump …
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Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
… with a coupled energy of 430 fJ in a 26mm long PPLN waveguide device. The temporal walk-off between the interacting pulses in this interaction resulted in an acceptance bandwidth of 0.75 nm, limiting the measurable pulse duration to ~ 4.5 ps. In order to overcome this limitation, we proposed and …
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Quantum information applications of frequency upconversion
… inside of a periodically poled lithium niobate (PPLN) crystal, we are able to achieve near unit conversion efficiency. We use this conversion process to create high-efficiency infrared single-photon detectors by upconverting infrared photons to visible ones and using efficient silicon avalanche …
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Transient frequency modulation absorption spectroscopy as a probe of gas-liquid scattering
… performed in periodically poled lithium niobate (PPLN) to generate the MIR. This probe was characterised by proof-of-principle experiments, including preliminary studies of inelastic CH4 scattering, and found to be sensitive, narrowband and possess Gaussian mode-quality. Accompanying Monte-Carlo …
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High speed nonlinear optical components for next-generation optical communications
… silicon, periodically-poled lithium niobate (PPLN), highly nonlinear fibre (HNLF) or chalcogenide glasses. However, nonlinear optical (NLO) components such as semiconductor optical amplifiers (SOAs), electroabsorption modulators (EAMs) and silicon nanowires are the most promising candidates as …