高稳定性电光调谐微晶片双频激光及其注入锁定调Q技术研究

Laser Radar Technology plays an important role in the detection and survey area. Dual-frequency Lidar belongs to the Laser Radar series. It can realize the distance measurement with phase method and speed measurement with Doppler principle, due to its laser borne microwave. And dual-frequency Lidar has the advantages of higher precision and anti atmospheric interference. Coherent dual-frequency laser serving as the light source of dual-frequency Lidar is worthy of investigation. In this research, the microchip based dual-frequency laser is going to be systematic studied in theory and experiment. It supposes to realize the tunable dual-frequency difference by electro-optically modulation, the stabilized dual-frequency difference output by phase locked loop, and the high peak power dual-frequency laser pulse output by the injection locking method. At the same time, the birefringence difference distribution in the transverse section of the microchips, the influence factors of the stability of the dual-frequency difference and the frequency difference locking technology, and the model of dual-frequency injection locking and its influence factors are going to be analyzed and researched. With this program, we can systematically realize the fast tunable dual-frequency pulsed laser with high stability, and also systematically investigate the relevant scientific problems.

激光雷达技术在侦查、测绘等探测领域发挥着重要作用。双频激光雷达作为激光雷达的一类，其采用光载微波的形式能够同时实现相位式测距与多普勒测速功能，具有测距测速精度高、抗大气干扰能力强的优势。相干双频激光作为双频激光探测的光源具有重要的研究价值。本课题针对微晶片双频激光器件开展系统性理论与实验研究，研究拟实现基于电光调制的双频频差调谐输出、基于锁相环路的差频频率高稳定度输出、基于注入锁定技术的高峰值功率双频脉冲输出。同时，课题将针对微晶片截面内双折射率差值分布的均匀性问题、双频激光频差稳定性影响因素及频差锁定技术、双频注入锁定技术的理论模型建立和实验影响因素等关键问题开展深入的分析和研究。通过本课题的开展将能够系统性地实现具有高稳定度的快速可调谐双频脉冲激光源，同时也将较为系统地对相关科学问题进行探索与解决。

本项目在执行过程中按照项目立项时所计划的研究进度开展，并完成了相关研究内容。包括双频激光频差输出范围、双频激光输出功率、双频激光的频率稳定性、双频注入锁定等。研究中分析了在双偏振微片谐振腔横截面内的频差分布情况、双频激光频差稳定性的影响因素及频差锁定技术、双频注入锁定中影响注入锁定的参数等关键科学问题。同时也在研究过程中挖掘了双频激光的横模特性这一更具基础科学性的研究内容，开展了相关的研究工作。在双频激光种子源方面，双频激光频差调谐范围能够实现100MHz-30GHz范围内的可控调谐，输出功率达到30mW；双频激光频差抖动在高精度温度控制下能够达到±50MHz以内，通过采用光电锁频反馈回路，能够有效锁定频差中心频率，且频差抖动可控制至MHz水平，理论最佳状态可达20kHz；研制了用于双频激光注入锁定的调Q谐振腔，并重点研究了基于双频激光种子的互注入锁定技术。此外，研究中也将双偏振激光腔的横模模式和横模拍频做了专门研究。