【作者】 王晓雷； 翟宏琛； 王毅； 朱晓农；

【Author】 Wang Xiaolei, Zhai Hongchen, Wang Yi, and Zhu Xiaonong Institute of Modern Optics,Nankai University Key Laboratory of Opto-electronical Information Science and Technology, MEC

【机构】 南开大学现代光学研究所教育部光电信息技术科学重点实验室；

【摘要】 本文首次报道一种专门用于记录飞秒激光引发空气电离动态过程的脉冲数字显微全息光路。在所设计的分割物波及参考波的子脉冲的光路中,可通过调节子脉冲串的时间延迟及出射角度,记录应用立体角分复用技术的、脉冲间隔连续可调的多幅子全息图。分析计算表明,该光路可在CCD的一帧图像上自动连续记录物波与参考波间夹角不变的、时间分辨率为飞秒数量级的飞秒激光诱发空气电离过程的多幅全息图像,可大大提高数字分频过程中的空间分辨率,对于研究该过程的电离阈值与空气击穿的超快动态过程间的内在联系,具有重要的参考价值。更多还原

【Abstract】 We report, for the first time, a specially designed set-up of pulsed digital holography for micro- recording of air-ionization process induced by femto-laser. In the designed optical paths of object or reference, divided sub-pulses with continuously tunable time delay and propagation angle can be obtained to record a number of sub-holograms with spatial angle-multiplexing technique. Our calculation and analysis results show that this set-up can be employed to record automatically a series of holograms of air-ionization process induced by femto-laser on a frame of CCD image, with a constant angle of object to reference and with a time resolution of the order of femto-second, which will significantly improve the spatial resolution of the spatial frequency division during the digital reconstruction process and will be, therefore, of important value of reference to study the inherent relation between the threshold value of the air-ionization and its ultra-fast dynamic process.更多还原