2.7～3微米Er:LuYSGG晶体抗辐照微观机理及调Q激光特性研究

2.7～3μm中红外全固态激光在星载激光雷达、光电对抗、深空探测等领域有重要应用前景。然而，激光晶体作为激光器的“心脏”，极易受空间辐照环境影响，光学性能发生退化导致激光器无法正常工作或提前报废。针对这一问题，申请者提出一种既具有优异激光特性又具有较强抗辐照能力的2.7～3μm Er:LuYSGG晶体，为空间激光应用奠定材料基础。. 本项目拟开展Er:LuYSGG晶体制备、辐照损伤演化过程、热效应产生及影响因素、电光调Q激光运转特性等研究。掌握提拉法制备高质量晶体的稳定工艺；建立晶体组分、结构、缺陷与抗辐照性能之间的关系，探明抗辐照微观机理；通过模拟温度分布揭示热效应产生机制，结合热键合与曲端面加工，针对性地改善热管理，有望实现LD侧泵的高峰值功率、窄脉宽、高光束质量2.7～3μm电光调Q激光，满足辐照环境应用需求，对于发展空间全固态中红外激光技术具有重要的科学意义和应用价值。

2.7～3μm mid-infrared all solid-state laser has important application prospects in the fields of space-borne lidar, optoelectronic countermeasure, and deep space exploration, etc. However, the laser crystal, as the “heart” of the laser, is easily affected by the radiation environment in space, and its optical properties will degrade, leading to the failure of the laser to work normally or to be scrapped in advance. To solve this problem, an Er:LuYSGG crystal with excellent laser performance and high radiation-resistance operating at 2.7～3μm is proposed, which lays a material foundation for the application of space laser.. This project intends to carry out the investigation on the preparation of Er:LuYSGG crystal, the evolution process of radiation damage, the generation and influencing factors of thermal effect, and the operation characteristics of electro-optic Q-switched laser. Master the stable preparation process of high-quality crystal by Czochralski method. Establish the relationship between crystal components, structure, defects and radiation resistance, and explore the micro-mechanism of radiation resistance. Reveal the mechanism of thermal effect through simulating temperature distribution, and improve the thermal management by combining thermal bonding and curved surface processing. It is expected to realize the high peak power, narrow pulse width and high beam quality of 2.7～3μm electro-optic Q-switched laser by LD side-pumping, which can meet the application requirements of radiation environment. It has important scientific significance and application value for the development of space all solid-state mid-infrared laser technology.