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Research on Supercontinuum Generation in Photonic Crystal Fiber and BK9 Glass

Author: WangShengBao
Tutor: LiuWenJun
School: Harbin Institute of Technology
Course: Optics
Keywords: Photonic crystal fiber Femtosecond pulses Soliton Supercontinuum
CLC: O433
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


The single-mode photonic crystal fiber (PCF) generally have a mode field diameter of King singlemode, tunable dispersion, high nonlinear coefficient, etc.. Photonic crystal fiber has a special structure, can have different characteristics depending on the need to change the internal structure of the photonic crystal fiber. At present, the use of photonic crystal fiber as the core device more mature products supercontinuum light source, optical amplifiers, photonic crystal fiber lasers, high-energy laser transmission, photonic crystal fiber grating sensing technology, optical signal processing. Supercontinuum spectrum of applications is very impressive, in which the microstructure fiber supercontinuum white light source as a new type of light source, optical communications, optical coherence tomography (OCT), Academy of Meteorological Sciences, wide-spectrum detection, ultrashort pulse compression timing, frequency clock, with a wide range of applications. Therefore, the role of femtosecond pulses photonic crystal fiber supercontinuum research with high scientific value. The main contents are as follows: (1) is derived from Maxwell's equations ultrashort pulse transmission in the PCF theoretical model - nonlinear Schrodinger equation in order nonlinear effects generalized nonlinear Schrodinger equation by coupled pulse several forms, and the normalized form of the nonlinear Schrodinger equation, step-by-step Fourier method in the numerical solution of the nonlinear Schrodinger equation, introduced a variety of high-end ultrashort pulses in photonic crystal fiber transmission non-linear effects. (2) On the basis of theoretical analysis, the use of quick step-by-step Fourier method in the time domain and spectral domain simulation in MATLAB environment. In the photonic crystal fiber experimental study of the role of femtosecond pulses, the optical system is designed and built an experimental platform, the femtosecond pulse is coupled into the fiber and K9 glass and supercontinuum. (3) analysis of the role of photonic crystal fiber femtosecond second red anomalous dispersion region, initial pulse pulse splitting and broadening effects, mainly for the high-order soliton pulse compression, non-solitons radiation Blue shift, higher-order soliton redshift division, self-phase The modulation response effect on the experimental results were analyzed. (4) frequency-resolved optical gating measurement principle and pulse inversion algorithm using cross-correlation frequency resolved optical gating (Xfrog) K9 glass supercontinuum measurement of the time-domain characteristics, and under different conditions and the experimental results of the frequency spectrum.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Spectroscopy
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