LD泵浦单频连续波自调谐翠绿宝石激光器关键技术研究

全固态单频连续波可调谐激光器在精密测量及量子信息等前沿科学研究领域具有很重要的应用价值，为了研制能够满足这些研究领域应用需求的优质可调谐激光光源，本项目拟采用性能优良的翠绿宝石激光晶体作为激光增益介质开展红光LD泵浦的单频连续波自调谐翠绿宝石激光器的研究。首先，基于翠绿宝石晶体的增益特性和双折射特性，使其既作为增益介质又作为调谐元件，实现高效率宽带自调谐翠绿宝石激光器；在此基础上，利用自注入反馈技术，通过优化激光晶体工作温度、输出耦合镜透射率及自注入反馈装置引入的线性损耗，实现稳定单向运转的宽带自调谐翠绿宝石激光器；进一步地，采用无调制锁定方法高效稳定锁定标准具，实现翠绿宝石激光器的稳定单频运转，并通过连续扫描激光谐振腔的腔长实现激光器输出波长的连续调谐。最终实现一种结构紧凑、低成本、高效率的单频连续波自调谐翠绿宝石激光器，最高输出功率≥3W，调谐范围>80nm，连续扫描范围>35GHz.

All-solid-state single-frequency continuous-wave (cw) tunable lasers are essential light sources in the leading edge research fields of precision measurement, quantum information, and so on. To satisfy the requirements of these research fields on the high-quality tunable laser, this project intends to conduct the research of the red LD-pumped single-frequency continuous-wave self-tunable Alexandrite laser with the excellent Alexandrite crystal as the gain medium. Firstly, the efficient broadband self-tunable Alexandrite laser is obtained with the Alexandrite crystal as gain medium and tuner simultaneously based on its gain and birefringence characteristic. On this basis, the self-injection technology is adopted to realize the stable unidirectional operation of the broadband self-tunable Alexandrite laser by optimizing the temperature of the crystal, the output coupling mirror transmissivity of the resonator and the loss introduced by the feedback loop. Further, the intracavity etalon is efficiently and stably locked by utilizing the modulation-free locking method to attain stable single-longitudinal-mode operation of the laser and the continuously frequency tuning of the laser is implemented by continuously scanning the cavity length of the laser. Eventually, the compact, low-cost and high efficiency single-frequency cw Alexandrite laser is expected to be obtained with the maximal output power higher than 3W, tunable range broader than 80nm and continuously scanning range larger than 35GHz.