基于增益光栅的调Q脉冲单频固体激光器稳频机理研究

采用基于增益光栅的自适应环形激光谐振腔结构，开展种子注入调Q脉冲单频激光器稳频机理研究，提高单频输出激光的频率稳定性、可靠性和抗干扰能力。研究增益光栅的二维动态特性，获得增加增益光栅的横向光场变化范围的途径；研究在腔内插入相关元件变换腔内光束尺寸方法，抑制相位共轭反射率不一致，消除相互作用光束的横向形状和光束位置变化对稳频的影响，揭示种子注入环形激光谐振腔扩展增益光栅作用区域稳频的机理；优化谐振腔光学元件的参数，获得高重复频率、大脉冲能量、高光束质量的调Q脉冲单频稳频激光输出；研究稳频系统的抗干扰特性，获得具有自主知识产权的关键技术，为探索调Q脉冲单频稳频激光器可靠性的提高提供一新途径，为激光雷达、光电对抗等系统的研究提供支撑。

With the self-adaptive ring resonator based on the gain grating, the frequency stabilization mechanism of an injection-seeding Q-switched pulsed single frequency laser is investigated, aiming at improving frequency stability, reliability and anti-jamming capability of single frequency output laser. Dynamic characteristic in two spatial dimensions of the gain grating is studied to get access to ways of increasing the lateral light field variation range in the gain grating. Moreover, inserting relative elements in the cavity to control the inner cavity beam size is investigated. This method suppresses inconsistent of phase conjugate reflectivity, eliminates the effects of beam transverse shape and beam position change of the interacting beams on dynamic range, and reveals frequency stabilization mechanism in the gain grating acting region of the injection-seeding ring resonator, therefore improving frequency stability, reliability and anti-jamming capability of the single longitudinal mode output laser. By optimizing the parameters of the optical elements in resonator, Q-switched pulsed single frequency laser with high frequency stabilization, high repetition rate, high pulse energy, good beam quality will be obtained. Besides, researching on the anti-jamming capability of the frequency stabilization system and acquiring the critical technologies with independent intellectual property rights, this project will provide a novel way to improve reliability of such laser system, simultaneously offers great support to research on the lidar, optoelectronic countermeasure system and other systems.