摘要
高亚稳态原子数密度是光抽运稀有气体激光器的研究重点之一.考虑到Ar亚稳态能级与Kr激发态5p[3/2]2能量仅相差20 cm^(-1),在He/Kr放电体系中加入氩气,有望通过能量共振转移达到补充Kr亚稳态原子(Kr^(*))密度的目的.本文从光谱诊断及亚稳态原子密度激光吸收光谱测量两个角度进行实验分析,结果表明:在100 mbar(1 bar=10^(5)Pa),1%Kr,12.5%Ar气体条件下,Kr(5p[3/2]2)向亚稳态能级跃迁辐射谱线峰值最高可增强约10倍,该跃迁谱线尾部信号从0.6μs延长至14.25μs.实验同时测量了不同Ar含量下Kr^(*)密度.在100 mbar,1%Kr气体条件下加入15%Ar,Kr^(*)密度从4.94×1011cm-3提升至6.96×10^(12)cm^(-3).在气压600 mbar,1%Kr/He混合气体中加入5%Ar,Kr^(*)峰值密度从4.69×10^(13)cm^(-3)提升至5.79×10^(13)cm^(-3).这些结果说明,Ar-Kr的共振能量转移能有效提高Kr^(*)密度,有利于光抽运Kr^(*)激光器的高效运行.
High metastable density is one of the research hotspots of optically pumped rare gas laser(OPRGL).Considering that the Ar metastable state energy level is only 20 cm^(−1) different from the Kr excited state 5p[3/2]2,argon gas is added to the He/Kr discharge system.Owing to the long lifetime of the Ar metastable state atoms,through the collision resonance energy transfer process of Ar(4s[3/2]_(2))→Kr(5p[3/2]_(2)),the purpose of supplementing and increasing the metastable density of Kr(Kr^(*))can be realized.In the case of obtaining the same metastable density,the pressure of the discharge power source is reduced,and a new idea is provided for further obtaining a high metastable density in a large discharge volume.In this work,the experimental analysis is carried out from the perspectives of spectral diagnosis and measurement of metastable density by laser absorption spectroscopy.The results show that the peak of radiative transition line of Kr high energy level atoms participating in the collision to the metastable state energy level is significantly enhanced after adding argon,and the tail signal of the transition line is extended within one discharge cycle.Under the gas conditions of 100 mbar,1%Kr and 12.5%Ar,the peak value of the spectral line can be enhanced by about 10 times,and the tail signal of the transition line can be extended from 0.6μs to 14.25μs.At the same time,the density of Kr metastable energy level atoms is measured under different Ar content.Under the gas conditions of 100 mbar,15%Ar and 1%Kr,the density of Kr^(*)increases from 4.94×10^(11) cm^(−3) to 6.96×10^(12) cm^(−3).At low pressure,the absorption linewidth of Kr metastable atoms narrows with the increase of Ar content.Under the gas condition of 600 mbar and 1%Kr,when the content of Ar is increased to 5%,the peak density of Kr^(*)increases from 4.69×10^(13) cm^(−3) to 5.79×10^(13) cm^(−3),i.e.the increment is 20%.Although the enhancement of metastable-atomgeneration at high pressure is not so significant as those at low p
作者
沈元毅
雷鹏
王新兵
左都罗
Shen Yuan-Yi;Lei Peng;Wang Xin-Bing;Zuo Du-Luo(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第19期162-170,共9页
Acta Physica Sinica
关键词
光泵稀有气体激光器
激光吸收光谱法
碰撞能量共振转移
光谱诊断
optically pumped rare gas lasers
laser absorption spectroscopy
collision energy resonance transfer
spectral Diagnostics
