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 20 of 39 for “"supercontinuum"”.
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Harmonic and Supercontinuum Generation in Zinc-Blende Materials
… suitable for extremely broadband harmonic and supercontinuum generation. This dissertation reports on the development of numerical methods for simulating light-matter interactions in polycrystalline zinc-selenide and zinc-sulfide. It is the first, to the best of our knowledge, quantitative and …
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Design and optimization of chalcogenide waveguides for supercontinuum generation
… research work presents numerical simulations of supercontinuum (SC) generation in optical waveguides based on Ge11.5As24Se64.5 chalcogenide (ChG) material. Rigorous numerical simulations were performed using finite-element and split-step Fourier methods in order to optimize the waveguides for …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
… for and applied to liquid-phase analysis, with supercontinuum (SC) radiation used for liquid-phase absorption for the first time. Firstly, supercontinuum cavity enhanced absorption spectroscopy (SC-CEAS) was used for the kinetic measurement of chemical species in the liquid phase using a linear …
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Development Of A Supercontinuum Based Photoacoustic Aerosol Light Absorption And Albedo Spectrometer (PALAAS)
… thesis describes the ongoing development of a supercontinuum based multi-wavelength photoacoustic instrument to measure the light absorption and scattering coefficients of aerosols. Collimation techniques for supercontinuum sources using lens-based and off-axis parabolic mirror-based …
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Nonlinear optical microscopy and spectroscopy by pulse shaping of a coherent fiber supercontinuum
… imaging by pulse shaping of a coherent fiber supercontinuum is demonstrated and applied to breast cancer research. The supercontinuum is generated in an all-normal-dispersion fiber, achieving a spectrum spanning the optical biological window with high coherence and high power. Efficient …
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Numerical and Analytical Studies of Electromagnetic Waves: Hermite Methods, Supercontinuum Generation, and Multiple Poles in the SEM
… from a lossless sphere, and analysis of supercontinuum generation. Hermite methods are a new class of arbitrary order algorithms to solve partial differential equations (PDE). In the first chapter, we discuss the fundamentals of Hermite methods in great detail. Hermite interpolation is …
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Multiphoton imaging and control of opsins in living neural systems by spectral-temporal modulation of a supercontinuum source
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Optical studies of photonic crystals and high index-contrast microphotonic circuits
… large optical bandwidths through newly developed supercontinuum based techniques. Novel all-fiber supercontinuum sources facilitate the generation of unpolarized supercontinuum light over 1.2-2.0 micron wavelengths. Broadband experimental methods make possible the application of these sources to …
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Sub-femtosecond precision timing distribution, synchronization and coherent synthesis of ultrafast lasers
… Finally, the synchronization of a 8 fs fiber supercontinuum at 1200 nm to a 7 fs Ti:Sapphire laser pulse train at 800 nm is achieved for both pulse timing and phase with attosecond precision. This achievement is enabled by the development of a novel scheme for stabilization of the carrier …
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Optical coherence tomography: Development of functional extension and algorithms tailored to biomedical applications
… study included the development of a custom-built supercontinuum laser-based spectral-domain OCT (SD-OCT) system. The custom design contains a hardware extension for extended depth-imaging capabilities. The broadband bandwidth of a supercontinuum source provides the ability to retrieve …
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Self-referenced 1.5 [mu]m fiber frequency combs at GHz repetition rates
… rate and used to generate over an octave of supercontinuum spanning 1 [mu]m -2.4 [mu]m. Carrier-envelope offset frequency (fceo) detection using f-2f self-referencing provides confirmation that the continuum's frequency comb structure remains intact after undergoing amplification, …
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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
… sub-components include efficient: supercontinuum generation, harmonic generation, and parametric wavelength conversion devices, all of which should ideally be powered by a compact, low cost, solid state pump source. To complicate matters further, requirements for parametric …
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Direct and inverse design of microstructured optical fibres
… Applications range from the generation of supercontinuum light to optical sensing, nonlinear telecom devices and the generation and delivery of extremely high optical powers. Photonic bandgap fibres, allowing light guidance in a hollow core, are also extensively studied. The main issues …
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Lūžio rodiklio modifikavimas stikluose ir kristaluose veikiant ultratrumpaisiais lazerio impulsais /
… in fused silica such as filament formation and supercontinuum generation is experimentally investigated.
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Studies of third-order nonlinearities in materials and devices for ultrafast lasers
… fiber was used to generate smooth, controlled supercontinuum between 1200 to 1800 nm.
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Optical Propagation of Self-sustaining Wavefronts and Nonlinear Dynamics in Parabolic Multimode Fibers
… will then conclude by delving into the topic of supercontinuum generation in parabolic multimode fibers which, in the upcoming years, has great potential of becoming important in optics.
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Advances in Optical Coherence Tomography and Microscopy for endoscopic applications and functional neuroimaging
… resolution OCT are demonstrated based on supercontinuum generation in highly nonlinear optical fibers. Second, an extension of OCT called optical coherence microscopy (OCM) is developed for in vivo cellular imaging. High speed OCM system designs are demonstrated and characterization of OCM …
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Spectroscopic measurements and modeling of carbonaceous particle combustion in a shock tube
… DBI-EI is developed further by combining a supercontinuum source and an imaging spectrograph, extending classical back-illumination from one/two-color to dense spectral coverage while maintaining robustness to beam steering. The optical efficiencies feed into broadband emission measurements …
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Development and applications of dispersion controlled high nonlinearity microstructured fibres
… future work.<br/><br/>A systematic study of the Supercontinuum Generation phenomenon is presented in this thesis. By using fibres with different dispersion profiles, pumping at 1.06 μm, the nonlinear effects such as Self-Phase-Modulation, Four-Wave-Mixing and Self-Soliton-Frequency-Shift, which …
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