Ultrafast nonlinear optical processes: Cross-phase-modulation and stimulated hyper-Raman scattering.
Item
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Title
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Ultrafast nonlinear optical processes: Cross-phase-modulation and stimulated hyper-Raman scattering.
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Identifier
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AAI9315512
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identifier
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9315512
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Creator
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Wang, Quan-Zhen.
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Contributor
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Advisers: R. R. Alfano | P. P. Ho
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Date
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1993
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Optics
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Abstract
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The objective of this thesis is to study some of the high order NLO processes. These NLO processes are cross-phase-modulation (XPM) and stimulated hyper-Raman scattering (SHRS). XPM is an intrinsic NLO process which occurs in many nonlinear optical processes. XPM is a powerful method to control the spectral, temporal, and spatial properties of ultrashort optical pulses. SHRS is a fifth order nonlinear optical process which is important for additional spectral and temporal control of ultrashort optical pulses.;Some of the basic properties of the second- and third-order nonlinearities are reviewed and discussed. Basic nonlinear wave equations are derived from Maxwell equations. These wave equations can be used to present a very good quantitative description of the cross-phase-modulation effects on light pulse propagation.;The theory and experimental observation of second-harmonic cross-phase-modulation effect is described. Experimental investigation on the spectral broadening and the temporal behavior of the second-harmonic cross-phase-modulation effect in ZnSe crystal are presented.;The theoretical analysis of degenerate-cross-phase-modulation in multimode optical fibers is presented. Experimental measurements of the spectral broadening and distribution of picosecond laser pulses propagating through short multimode glass optical fibers are presented. Comparison of the measurements in multimode optical fibers with those in single mode optical fibers is also given. The study is important for the understanding the propagation of ultrashort pulses in large core multimode optical fibers.;Our theoretical research predicts the effects of degenerate-cross-phase-modulation on the spectral and temporal profiles of the pump and probe pulses for both single- and double pump pulses. Numerical solutions for the spectral and the temporal distributions of the pump and probe pulses are calculated. The influence of input intensity and initial time delay between the pulses are discussed. The effect of degenerate four-wave mixing on pulse amplification and compression are described. The experimental measurements of the predicted pulse compression and amplification effects in optical fibers are given.;Theoretical study and experimental observation of stimulated hyper-Raman scattering in an organic crystal are presented. A parametric instability theory is applied to compute the intensity dependence of SHRS signal. (Abstract shortened by UMI.).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
