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利用超音速喷管实现化学氧碘激光器(COIL)内流场的加速降温,进而使增益有量级上的提升是激光器研究中的重大进展。但超音速内流场中存在着复杂的三维结构,流场结构与光束质量的关联机制是设计相关气动部件的重要判据。为此,采用了包含流场-化学场、光场和热结构计算模块的全耦合仿真平台,数值解析了在不同流场条件下的出光性能,重点分析了内流场中不同方向上激波对近场输出光斑的影响及相互关系,从而确定了相关气动部件的优化设计方式。改善后的光束近场均匀性(F因子)提高了45%。
The use of supersonic nozzles to achieve accelerated cooling of the flow field in the chemical oxygen-iodine laser (COIL), which in turn, has an order of magnitude improvement in gain, is a significant advance in laser research. However, there is a complex three-dimensional structure in the supersonic flow field. The correlation mechanism between the flow field structure and the beam quality is an important criterion for the design of the related pneumatic components. For this reason, a fully coupled simulation platform including flow field - chemical field, optical field and thermal structure calculation module is adopted, and the light output performance under different flow field conditions is analyzed numerically. The shock wave in different directions in the flow field is analyzed emphatically The impact of the near field output flare and their relationship to determine the optimal design of the relevant pneumatic components. The improved near-field beam uniformity (F-factor) was improved by 45%.