整形激光脉冲与激光探针同步技术

实现了应用于神光Ⅱ装置中的高精度整形激光脉冲与激光探针同步方案。在该方案中,激光探针经硅光导开关进行光电转换之后作为激光脉冲整形单元的触发信号,使激光脉冲整形单元,输出与激光探针同步的整形激光脉冲。为了降低由于触发信号不稳定引起的时间晃动,在光电转换之前放大激光探针,以调整激光脉冲整形单元触发信号的幅度。在神光Ⅱ装置中实现了整形激光脉冲与激光探针小于4.5 ps(均方根)的时间同步精度。

A scheme of high-accuracy time-synchronization between a shaped optical pulse and a probe optical pulse has been developed and used in the Shenguang II facility. In this scheme, the probe optical pulse is firstly photoelectrically converted by the Si photoconductive switch and then used to trigger the laser pulse-shaping subsystem, so that laser pulse-shaping subsystem produces a shaped optical pulse synchronized with the probe optical pulse. In order to decrease time jitter induced by amplitude fluctuation of the triggering signal, the probe optical pulse is amplified to adjust amplitude of the triggering signal before photoelectric conversion. The synchronization root-mean-error less than 4.5 ps between the two pulses has been achieved with this scheme.