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提出应用于神光Ⅱ装置中的拍瓦短脉冲与主压缩脉冲高精度同步方案。在该方案中,通过与门技术实现了锁模激光器输出的短脉冲序列与主激光总控触发信号时间的初步锁定,该技术是实现惯性约束核聚变高功率激光装置中长短脉冲精确同步的关键。由总控系统的触发信号作为与门中可编程现场门阵列(FPGA)电路的触发信号,锁模激光器输出的百皮秒激光脉冲通过光电转换放大,并由同步展宽装置进行处理之后,作为FPGA电路的时钟信号,能够实现系统主激光门脉冲触发信号与短脉冲激光之间均方根值为26.3ps的同步精度,这一技术可有效提升装置中同步系统的稳定性。
This paper proposes a high-precision synchronization scheme of shpw pulse and main compression pulse used in SG-II device. In this scheme, the short pulse sequence of the mode-locked laser output and the primary locking of the master laser trigger signal are realized by the AND gate technique. This technique is the key to realize the accurate synchronization of the long and short pulses in the inertial confinement fusion fusion high power laser device . The trigger signal of the master control system is used as the trigger signal of the programmable gate array (FPGA) circuit in the gate. The picosecond laser pulse outputted by the mode-locked laser is amplified by photoelectric conversion and processed by the synchronous broadening device, The clock signal of the circuit can realize the synchronization precision of 26.3ps between the system main laser gate pulse triggering signal and the short pulse laser. This technique can effectively improve the stability of the synchronous system in the device.