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 5 of 5 for “"phasematching"”.
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Modelling of capillary high harmonic generation
… this thesis presents a spatio-temporal phasematching model for capillary HHG, and a modal-based model of laser propagation in an ionising gas.<br/><br/>The phasematching model takes into account the full spatio-temporal nature of the capillary HHG process to determine the harmonic …
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Femtosecond optical parametric oscillators for the mid-infrared
… laser. Noncollinear critical birefringent phasematching was used in an oscillator based on KTiOAsO4, which was tunable from 1.03 to 1.2 mum and 2.51 to 4.1 mum by varying the crystal angle. The mid-infrared pulses were sub-100 fs, and essentially free from frequency chirp. With appropriate …
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Low Loss Orientation-Patterned Gallium Arsenide (OPGaAs) Waveguides for Nonlinear Infrared Frequency Conversion
… of the grating period Λ needed for quasi-phasematching. Record low RMS surface roughness values of 5 nm were obtained using this new growth process. In addition, record low waveguide losses of 1.0 dB/cm were measured, validating our theoretical predictions, and nonlinear gain was …
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Investigation of nonlinear processes and device designs applicable to the creation of a compact, broadly tunable laser based on a tantalum pentoxide planar lightwave circuit platform
… must take place in a device supporting ‘variable phasematching’.<br/><br/>One of the key sub-components of a broadband tunable laser is a supercontinuum (SC) source. Supercontinuum (SC) generation is a nonlinear optical phenomenon that generates a spectrum across a wide range of frequencies. The …
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Quantum information applications of frequency upconversion
We demonstrate the utility of frequency upconversion in a non-linear crystal for quantum information applications. By combining a bright “escort” beam with a signal photon inside of a periodically poled lithium niobate (PPLN) crystal, we are able to achieve near unit conversion efficiency. We use …