钠乙烷准分子产生钠D_2线荧光寿命的实验研究  

Experimental Study of Sodium D_2 Line Fluorescence Lifetime of Sodium-Ethane Excimer Pairs

作　　者：胡墅[1] 盖宝栋 夏栩笙 郭敬为[1] 王鹏远[1] 李慧[1] 刘金波[1] 何山[1,2] 蔡向龙 陈莹 

机构地区：[1]中国科学院大连化学物理研究所化学激光重点实验室,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《中国激光》2017年第9期21-26,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61505210);中国科学院化学激光重点实验室创新课题基金(KLCL-2016-N12)

摘　　要：准分子宽带抽运钠金属激光器具有实现钠信标光源的潜质,该激光器在运转过程中需要借助准分子将钠原子由基态转换为激发态,因此有必要对由准分子解离产生的钠原子激发态荧光寿命开展实验研究。采用不同波长的蓝翼抽运光对不同温度的钠乙烷准分子体系进行激发,分别测量钠D_1线和钠D_2线的荧光寿命。结果表明,3~2P_(3/2)与3~2P_(1/2)能级的荧光寿命明显长于其自然寿命,且激发波长越长,荧光寿命延长得越明显。辐射捕获效应是导致荧光寿命延长的另一个因素。随着泵浦单光子能量下降,钠乙烷准分子被激发到A^2Π_(3/2)态的概率变大,能够长时间产生激发态钠原子,这也会使荧光寿命延长。与钠D_1线相比,钠乙烷准分子体系钠D_2线的放大自发辐射信号的可放大性更好。更好的可放大性以及较长的荧光寿命使得钠D_2线激光更易于实现。Excimer pumped sodium laser has the potential to realize the sodium beacon light source. During the operation of the laser, excimer is utilized to pump sodium atom from ground state to excited state, so it is necessary to experimentally study the fluorescence lifetime of excited sodium atom produced from dissociation of excimer pairs. In this work, sodium-ethane excimer pairs are excited by blue satellite pumping light with different wavelengths, and the fluorescence lifetimes of sodium D1 and D2 lines are measured at different operation temperatures. The experiment results demonstrate that the fluorescence lifetimes of 32P3/2 and 32P1/2 states are obviously longer than their natural lifetimes, the longer the excitation wavelength, the more obvious the extended fluorescence lifetime. Radiation trapping effect is considered as another factor that leads to the fluorescence lifetime lengthening. On the other hand, as the single photon energy decreasing, the probability of excimer pairs excited to A2 II3/2 state inereases, and the excited sodium atom can be produced during a longer period, and this may also lead to the fluorescence lifetime lengthening. For sodium-ethane excimer pairs, the amplification characteristic of sodium D2 line amplified spontaneous emission signal is better than that of sodium D1 line. The better amplification characteristic and longer fluorescence lifetime make sodium D2 line laser easier to achieve.

关 键 词：激光器 受激准分子激光器 碱金属蒸气 荧光寿命 辐射俘获 放大自发辐射 

分 类 号：TN248.2[电子电信—物理电子学]