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通过对化学激光器腔内介质不均匀性的分析指出 ,HF连续波化学激光器 (CWCL)腔内的气动介质的有序不均匀扰动将是影响输出光束质量的主要因素之一。利用建立的激光器腔内二维折射率分布模型对基频和泛频HFCWCL有无激射条件下腔内气动介质的有序分布进行了数值计算。分析比较了 3 Slot(3S)和 2 Slot(2S)喷管结构的激光器的性能和气动介质对光束质量的影响。数值模拟指出 ,在望远式非稳腔输出条件下 ,腔内 1m喷管阵列的气动介质有序不均匀扰动对光束质量的影响不大 ,但由于相位扰动的均方差将随喷管阵列长度的平方增大 ,对于HF泛频输出尤应重视。另外 ,3S在工作性能和光束质量方面均优于 2S。
The analysis of the inhomogeneity of the chemical lasers indicates that the orderly uneven perturbation of the aerodynamic medium in the CW CW lasers will be one of the main factors affecting the quality of the output beam. The model of two-dimensional refractive index distribution in the laser cavity was used to numerically calculate the ordered distribution of the aerodynamic medium in the cavity with or without HFCWCL. The performance of lasers with 3 Slot (3S) and 2 Slot (2S) nozzle structures and the effect of aerodynamic medium on the beam quality were analyzed and compared. Numerical simulations show that under the condition of telescopic unstable cavity output, the orderly uneven disturbance of the aerodynamic medium in the 1m nozzle array has little effect on the beam quality, but the mean square error of the phase perturbation will vary with the length of the nozzle array Squared increases, especially for HF-output. In addition, 3S is superior to 2S in terms of workability and beam quality.