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报道一种全固化、全光纤的用于高功率激光驱动的惯性约束聚变驱动器的光脉冲产生系统,采用单纵模振荡器输出连续激光信号,经过相位调制器和振幅调制器,得到一个时间波形上已整形且具有一定带宽(约0.1nm)的激光脉冲,经光纤放大器放大并经光纤分束器分束后同时输出四路激光脉冲,各路激光脉冲先通过时间同步调整单元精确控制时间同步关系后,经可编程光纤衰减器调节各路之间的功率平衡后再通过光纤放大器做进一步放大并通过150m光纤传输输出至预放系统.该光纤系统可输出0.3—20ns、带宽0.1nm、能量数纳焦的几乎任意整形的激光脉冲,并已作为神光Ⅲ原型激光装置的前端系统成功发射近260余万发次.该系统结构紧凑,具有很高的稳定性和可靠性.
An all-curing, all-fiber optical pulse generation system for inertial confinement fusion driver for high-power laser driving is reported. A single-longitudinal-mode oscillator is used to output a continuous laser signal, which passes through a phase modulator and an amplitude modulator to obtain a time waveform The laser pulse that has been shaped and has a certain bandwidth (about 0.1nm) is amplified by an optical fiber amplifier and output by the optical fiber beam splitter and simultaneously outputs four laser pulses. Each laser pulse is precisely controlled by a time synchronization adjusting unit to accurately control time synchronization After the relationship, the programmable optical attenuator to adjust the balance between the various ways and then further amplified by a fiber amplifier and output through the 150m optical fiber output to the pre-release system.The optical fiber system can output 0.3-20ns, bandwidth 0.1nm, energy Several nanokons of almost any shape of the laser pulse, and has been successfully used as a front-end system of the SG-Ⅲ prototype laser device launched more than 260 million times. The system is compact, with high stability and reliability.