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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。
The excimer broadband pumped sodium metal laser has the potential to realize the sodium beacon light source. During the operation of the laser, the sodium atom needs to be converted from the ground state to the excited state by means of an excimer. Therefore, it is necessary to modify the sodium atom Excited fluorescence lifetime to carry out experimental study. Different wavelengths of blue-wing pumping light were used to excite the sodium ethane excimer system at different temperatures, and the fluorescence lifetime of sodium D_1 line and sodium D_2 line were measured respectively. The results showed that the fluorescence lifetime of 3 ~ 2P_ (3/2) and 3 ~ 2P_ (1/2) levels was significantly longer than their natural lifetime, and the longer the excitation wavelength, the longer the fluorescence lifetime was. Radiation trapping effects are another factor that leads to longer fluorescence lifetime. As the pump photon energy decreases, the probability of sodium ethane excimer being excited to the A ~ 2Π_ (3/2) state becomes larger, and the excited sodium atom can be generated for a long time, which also prolongs the fluorescence lifetime. Compared with the sodium D 1 line, sodium ethane excimer system sodium D 2 line amplified spontaneous emission signal can be more scalable. Better scalability and longer fluorescence lifetime make sodium D2 laser easier to achieve.