High Coherence Supercontinuum And Frequency Comb Generation In Flat Dispersion As2S3 Waveguides

Nonlinear optics is a branch of modern optics, which mainly studies the nonlinear phenomena and applications in nonlinear media. The development of laser provides the light source with high coherence, and promotes intensive research on the nonlinear. As a result, the study of nonlinear optics is becoming more and more mature and widely used.Supercontinuum and frequency comb are important parts of nonlinear optical research. The basic principle of the supercontinuum is that the initial narrowband pulse pumped in the medium and after a series of nonlinear interaction process the spectrum has greatly- broadened.However the principle of optical frequency comb generation is to select a series of discrete, equally spaced elements in the process of spectrum broadening. In this paper, the efficiency of the generation of the super continuum spectrum and the connection of the frequency comb are studied, and the main contents of the study and the main innovativeachievements are summarized as follows:1. Based on the generation of SC in the traditional optical waveguide,a scheme for the generation of SC in the As2S3/SiO2 strip/slot hybrid structure SOI waveguide is proposed. We discuss the dispersion characteristics and supercontinuum generation efficiency of vertical and horizontal slot waveguides. Through adjusting the structure parameters of the waveguide, we can obtain a flat dispersion curve, and gain a high coherence super continuous spectrum.2. The generation of frequency comb based on the supercontinuum model is studied. Based on the theory of Fourier transform, we deduce the feasibility of the generation of frequency comb, and obtain high-coherence frequency comb.This paper explores the related theories of supercontinuum and frequency comb generation in chalcogenide waveguide. The results enrich the theoretical model of supercontinuum and frequency comb generation, and lay the foundation of future researches.