摘要
典型的可调谐横向激励大气压[TE(A)]CO_(2)激光器输出激光的脉冲宽度为100~300 ns,并伴有3~10μs的脉冲“拖尾”,在9~11μm范围内输出约100条分立谱线。针对窄脉冲和连续调谐CO_(2)激光器的应用需求,开展了多大气压CO_(2)激光器的研究。采用高压脉冲调制电源,结合高气压脉宽压缩和光栅选线技术,实现连续调谐红外激光输出,脉冲宽度为30~50 ns。当工作电压为72 kV、气压为7.07×10^(5)Pa时,输出激光脉冲的能量为590 mJ,脉冲宽度为35.7 ns,并在10R(32)至10R(26)谱线之间实现连续调谐输出。
Objective High peak power and continuous tuning are main characteristics of transversely excited atmospheric-pressure[TE(A)]CO_(2)lasers which have great potential applications in laser spectroscopy,laser chemistry,laser medicine,laser manufacturing,military and so on.Unlike those working at a pressure around 1 atm,tailing phenomenon is mostly eliminated in multi-atmospheric-pressure CO_(2)lasers and the pulse width is compressed from hundreds nanoseconds to tens nanoseconds level,so that the total interactive efficiency of the abovementioned applications is further improved.Compared with other pulse witdh compressing techniques such as mode-locking,Q-switching,plasma switching,etc.,another advantage of multi-atmospheric-pressure CO_(2)laser is the integration of narrow pulse width and continuous tuning.Such a laser can achieve accurate output of arbitrary wavelength in the 9--11μm range.A typical application is proved to realize stimulated Raman scattering and excite isotope molecules,which may be an alternative high efficiency solution of present huge separation facilities.Methods The theory consists of the continuously tunable theory and multifrequency dynamic model.The continuously tunable theory means that as the working pressure increases,the discrete spectral lines are gradually broadened until they overlaps each other,so the output becomes continuously tunable.The multifrequency dynamic model can describe the progress of pulsed CO_(2)laser at high pressure.In this model,changing the electricity,gas and optical parameters can result in different output laser pulse waveforms,which can be further used to analyze the output characteristics such as energy,pulse width,power and wavelength.In experiment,a multi-atmospheric-pressure pulsed CO_(2)laser was set up.The laser mainly consisted of the energy injection unit,the main discharge unit and the resonant cavity.A high voltage DCpower supply(≤32 kV)and a triple Marx circuit were used for power supply and pulse modulation in the energy injection circuit.The p
作者
卢越
朱子任
白进周
叶静涵
谭荣清
郑义军
李业军
Lu Yue;Zhu Ziren;Bai Jinzhou;Ye Jinghan;Tan Rongqing;Zheng Yijun;Li Yejun(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;China Institute of Atomic Energy,Beijing 102413,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2022年第23期46-52,共7页
Chinese Journal of Lasers
基金
稳定基础科研计划资助(BJ19001810)。
关键词
激光器
CO_(2)激光器
多大气压
连续调谐
脉宽压缩
lasers
CO_(2)laser
multiple atmospheric pressures
continuous tuning
pulse width compression
