低温3.0～4.2μm波段第一泛频一氧化碳激光器

3.0-4.2μm low temperature cooled first overtone CO-laser

根据国内外近30年来在一氧化碳激光器领域内的研究成果，从理论和实验两个方面论述若使第一泛频（△v=2）一氧化碳激光器在3．0～4．2μm波段成功运转．并能提供一定的输出能量，则必须对激光增益介质进行有效低温冷却的原因，并指出其长波端的极限值．理论上分析了一氧化碳分子电子基态X^1∑^＋中，高振动激发态的粒子布居数和小信号增益系数对激光放电等离子体温度的强烈依赖关系；分析了一氧化碳分子的能级结构，在常规的稳态动力学模型中引入了X^1∑^＋→A^1Ⅱ传能项，该传能项限定了第一泛频一氧化碳激光的长波端极限．理论分析和计算与国外同行的实验结果相吻合．

According to the achievements in the laser research field at home and abroad in the last 30 years based on both theoretical analysis and experimental results, the reason of cooling the first overtone （△v = 2） CO-laser gain plasma to get laser output with enough power in the wavelength ranging from 3.0 to 4. 2 tan is pointed out, which is the limit of long wavelength end of the first overtone CO-laser. The high excited vibrational state population and small signal gain factor of CO electronic ground state X^1∑^＋ are strongly dependent on laser plasma temperature. Based on theoretical analysis of CO energy level structure, an energy transfer term X^1∑^＋→A^1Ⅱ is introduced in the normal kinetic modeling of CO-laser. This energy term limits long wavelength end. The results of theoretical analysis and calculations are consistent with other experimental ones.