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以NH3作为远红外激光的工作气体 ,以N2 作为缓冲气体 ,对加入缓冲气体前后的小型超辐射光抽运远红外激光器作理论比较研究。基于缓冲气体作用机理模型 ,计算出激光工作物质的综合弛豫时间 ;通过解半经典的密度矩阵方程 ,计算出远红外激光输出的频谱特性和工作气压。计算表明 ,加入缓冲气体后 ,远红外激光的输出得到提高 ;存在一个最佳混合气体比例 ,在这一比例下远红外激光输出达到最大 ;加入缓冲气体后 ,最佳工作气压比加入缓冲气体前获得提高。
Taking NH3 as the working gas of far-infrared laser and N2 as the buffer gas, theoretical comparison was made on the small-sized super-radiative pumping far-infrared laser before and after adding buffer gas. Based on the mechanism model of buffer gas, the comprehensive relaxation time of laser working substance was calculated. The spectral characteristics and working pressure of far-infrared laser output were calculated by solving the semi-classical density matrix equation. The calculation shows that the output of the far-infrared laser is increased after the buffer gas is added; there is an optimum ratio of the mixed gas at which the far-infrared laser output reaches the maximum; after the buffer gas is added, the optimum working pressure is higher than that before the buffer gas Get improved.