对于多台固体激光器抽运的脉冲染料激光主振荡-功率放大(MOPA)链,在放大器中,抽运激光与染料种子激光不仅在空间上要求匹配,而且激光脉冲在时间上也要求匹配。为此,提出了进行激光脉冲时序的控制方法。该方法采用光纤、光开关和随机重复采样等技术实现快速激光脉冲的计算机数据采集。根据实验,抽运和染料激光脉冲的时间匹配最好时,它们的峰值几乎是重合的,由此提出以脉冲峰值处作为延迟时间的测量点来排除脉宽变化的影响,以及采用二次多项式曲线拟合的数据处理技术来排除峰值处延迟时间的测量干扰,实现抽运激光脉冲时序纳秒级的测量和闭环控制。控制系统的手动单步控制误差和延迟时间测量误差小于±0.2 ns,闭环控制精度可达±1 ns。

It not only needs space match but also needs timing match of pumping laser and dye laser seed in pulsed dye laser master-oscillator power-amplifier (MOPA) chain which employs more than one diode-pumped-solid-state lasers (DPSSL). So a laser pulse timing control method is reported to realize the timing match of pumping laser pulse and the seed laser pulse. The computer data acquisition of fast laser pulses is realized through fiber, fiber switch and random repetitive sampling technologies. When the pumping pulse and seed pulse are timing match, their peaks are almost superposition. So the laser pulse delay time is measured at its peak point to eliminate the influence of pulse-width change. The noise at laser pulse peak point is eliminated using binominal curve fitting in data process. This control system realizes the laser pulse timing measurement and close-loop control in nanosecond rank. The single step control error and measurement error are less than ±0.2 ns. The close loop control precision is ±1 ns.