小型脉冲光泵NH3分子远红外激光的Raman频谱研究

摘要

By solving the density matrix equation of quantum system,thespectral characteristics of V2:a→sR(0,0) and V2:a→sQ(5,4) transition in a miniature pulsed optically pumped NH3 far-infrared laser was calculated by means of iteration method.Which was pumped by TEA CO2-10R(6) line.The results of theoretical calculation showed that the spikes in raman spectrum of V2:a→sR(0,0) would appear,when the operating NH3 gas pressure was higher than a certain critical value or pumping power density was lower than a certain critical value.The spikes could not appear for spectrum of a→sQ(5,4)transition.Which was caused by raman processes interaction of AC Stark splitting.%通过求解量子系统的密度矩阵方程，采用迭代法计算了在TEACO2-10R(6)泵浦下，小型脉冲光泵NH3分子远红外激光器中，NH3分子的V2：a→sR(0，0)跃迁和a→sQ(5，4)跃迁的频谱特性。理论计算结果表明，对于a→sR(0，0)跃迁，当工作气压比临界值Pc高或泵功率密度比临界值Ipoc低时，将出现Raman频谱尖峰；对于a→sQ(5，4)跃迁，不出现频谱尖峰。频谱尖峰现象的根源是ACStark分裂的双光子相互作用的结果。