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作 者:冯刚[1,2] 陈绍武[1,2] 刘卫平[1,2] 王平[1,2] 闫燕[1,2] FENG Gang;CHEN Shao-wu;LIU Wei-ping;WANG Ping;YAN Yan(Northwest Institute of Nuclear Technology, X i’an 710024,China;State Key Laboratory of Laser ^Interaction with Matter, X i’ an 710024, China)
机构地区:[1]西北核技术研究所,西安710024 [2]激光与物质相互作用国家重点实验室,西安710024
出 处:《现代应用物理》2016年第2期18-24,共7页Modern Applied Physics
基 金:激光与物质相互作用国家重点实验室基金资助项目(SKLLIM1301Z)
摘 要:为了测量高能激光参数,基于石英晶体微天平测量高能激光功率或者能量的思路,搭建了石英晶体微天平测量系统,分别针对短时间(25ms到2s)激光辐照和长时间(20s以上)激光辐照以及石英晶体谐振器耐辐照能力开展了实验研究,并对实验结果进行了初步分析。实验结果表明,石英晶体谐振器受激光辐照时,谐振频率首先线性增加,然后趋于稳定。频率增加过程中,频率变化量与入射激光能量成正比;长时间辐照后频率趋于稳定,谐振频率相对于辐照前的变化量与入射激光功率成正比。测量系统最小可分辨的能量在7mJ以下,最小可分辨的功率在80mW以下,耐受激光功率密度不小于2.3kW·cm^(-2),辐照时间不小于60s。分析认为,石英晶体谐振器受激光辐照后,谐振频率发生变化与辐照后晶体内部温度场和应力场的变化有关。A QCM(quartz crystal microbalance) system for measuring the parameters of high power laser is built up and tested under the irradiation of short-time(25 ms to 2 s) and longtime (i ^20 s) laser. The experimental results on the quartz crystal indicate that the resonance frequency w il first rise linearly, and then to a steady value under the rradiation. During the rising period, the frequency increment s proportional to the laser energy. When it reaches the steady state on long-time rradiation, the incremental frequency compared to that front-end irradiation is proportional to th e laser power. The laser energy that the QCM can endure s less than 7 mJ and the laser power that theQCM can measure s less than 80 mW.The power density that the QCM can endure s u p t o 2 . 3 kW ? cm-2 , w hilethe irradiation time can be up to 60 s . Therefore, t s concluded that the variation of the resonance frequency of the QCM rradiated by the laser s due to the change of the inner temperature field and stress field.
分 类 号:TN216[电子电信—物理电子学]
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