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载气密闭循环氧碘化学激光器技术是一种有望大幅减小氧碘化学激光器体积和降低运行成本的技术,然而至今鲜见相关实验报道.采用超音速喷管加双螺杆真空泵建成了模拟实验装置,并通过测量超音速喷管前后和双螺杆真空泵出入口处的气动参数的方法开展了载气密闭循环氧碘化学激光器的可行性研究和工作稳定性模拟实验研究.模拟实验研究结果证明了该技术的可行性,发现并分析了其光腔压力随双螺杆真空泵转速提高而出现压力拐点的现象,确定了其稳定运行工作条件,为实现载气密闭循环氧碘化学激光器的真正运行和小型化奠定了良好的基础.,The closed diluted gas cycle chemical oxygen iodine laser (CGC-COIL) was considered as a promising miniaturized laser;however,we haven’t read any experimental study reports till now.In this study,a simulation experiment setup composed of supersonic nozzle and screw vacuum pump was built,and it was used to study the feasibility and the operation stability of CGC-COIL by means of measuring the inlet and outlet aerodynamic parameters of the supersonic nozzle and screw vacuum pump.The simulation experiments firstly demonstrated the feasibility of this type of laser,and then confirmed the optimal stable operation condition of this type of laser by finding and explicating the phenomenon that a simulation laser cavity pressure inflection point will appear with the increase of the revolving speed of screw pump.The study provides an experimental evidence for CGCCOIL realization and a new technological approach for chemical oxygen iodine laser miniaturization.