【作者】 翟冰洁； 左都罗； 卢宏； 程祖海；

【Author】 ZHAI Bing-jie ZUO Du-luo LU Hong CHENG Zu-hai (State Key Lab of Laser Technology.Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

【机构】 华中科技大学激光技术国家重点实验室；

【摘要】 为了进一步了解激光推进机理,利用紫外预电离横向激励大气压 CO₂激光器进行了推进抛物面光船的实验研究。利用光电二极管探测 He-Ne 激光束强度变化的方法对脉冲激光束作用于光船后产生的空气扰动进行了探测,实验发现,抛物面光船的焦距会对光船外部空气扰动造成影响,长焦距光船的空气扰动可探测到双冲击波结构,短焦距光船的空气扰动仅探测到单冲击波,还得到能量为32J 单脉冲激光作用短焦距光船,在激光脉冲开始5 ms 以后仍能探测到空气扰动的存在。利用单色仪探测了等离子体光谱,主要对线状光谱随时间的演化过程进行了分析。更多还原

【Abstract】 A brief introduces of some experiments about using UV-preionized TEA CO₂ laser pushed parabolic lightcraft is given. Using PIN to probe the intensity variations of a He-Ne laser,the information of the air disturbance due to the laser interact with the ligtcraft was obtained.The experiment showed that the focus of the parabolic lightcraft could influence the air-disturbance outside lightcraft.Two shock waves were detected for longer focus,but only one shock waves was detected for short focus,air-disturbance could be detected after 5 millisecond of laser pulse when single pulse with 32 J energy interacted with short focus lightcraft.Using monochromator detecting the spectrum of the plasma,the time evolvement process of line spectrum of the plasma has been analysised.更多还原