基于随机反馈的光纤光学参量振荡器研究

Random feedback-based random fiber lasers (RFLs) have aroused a great deal of research interests. A fiber optical parametric oscillator (FOPO) based on random feedback (RFB) has been proposed for the first time, which use randomly spaced fiber Bragg grating (FBG)，random phase shifted FBG and Rayleigh backscattering of single-mode fiber as RFB. Theory and simulation of RFB based on randomly spaced FBG and random phase shifted FBG will be studied. By modifying FBG writing system, recording technique of high accuracy, long-distance, high repeatability random feedback FBG will be obtained. The experimental setup of FOPO with three different RFB structures will be put forward, to investigate the random output performance, including output spectra and stability, output power and stability and output temporal characteristic and so on. The coherence length and linewidth of the proposed FOPO will be characterized by using the beat signal method and establishing a set of test system of coherence performance and linewidth. By combining RFLs with FOPO, the implementation of this project will effectively expand their research fields, and thus has important scientific interest, research value and application prospect.

基于随机反馈的随机光纤激光器近年来受到研究人员的广泛关注。本项目首次提出研究基于随机反馈的光纤光学参量振荡器，分别采用随机间距光纤光栅串列、随机相移光纤光栅和单模光纤的瑞利背向散射实现所需要的随机反馈特性。探究基于随机间距光纤光栅串列和随机相移光纤光栅的随机反馈理论基础并进行模拟，通过光纤光栅成栅系统的改造，掌握高精度、长距离、高重复的随机间距光纤光栅和随机相移光纤光栅刻写技术。搭建并优化基于三种不同随机反馈机制的光纤光学参量振荡器，研究其随机激光输出特性，包括输出光谱及其稳定性、输出功率及其稳定性、输出时域特性等。采用拍频信号技术，通过搭建一套随机激光相干性和线宽测试系统，对随机激光的相干性和线宽进行表征，并与传统激光器的特性进行对比分析。本项目的实施拓展了随机光纤激光器和光纤光学参量振荡器的研究，创新性地将两个研究热点结合起来，具有重要的科学意义和研究价值，有着很好的应用前景。

基于随机反馈的随机光纤激光器近年来受到研究人员的广泛关注。本项目提出并研究了基于随机反馈的随机光纤激光器和光纤光学参量振荡器，分别采用随机间距光纤光栅串列、随机相移光纤光栅、单模光纤的瑞利散射实现所需要的随机反馈特性。探究了基于随机相移光纤光栅和随机间距光纤光栅串列的随机反馈理论基础并进行模拟，对光纤光栅成栅系统进行了适当的改造，掌握了光纤光栅刻写技术，获得了随机相移光纤光栅和随机间距光纤光栅串列。搭建并优化实现了基于瑞利散射的随机光纤激光器、基于随机相移光纤光栅的随机光纤激光器以及基于瑞利散射的光纤光学参量振荡器，对其随机激光输出特性进行了详细的研究工作，包括输出光谱及其稳定性、输出功率及其稳定性等。本项目的实施拓展了随机光纤激光器和光纤光学参量振荡器的研究，具有重要的科学意义和研究价值，有着很好的应用前景。