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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。
For pulsed dye laser primary oscillation-power amplification (MOPA) chains with multiple solid-state lasers pumped, pumping and dye seed lasers in the amplifier not only require matching spatially, but laser pulses also require matching in time. For this reason, a method of controlling the laser pulse timing is proposed. The method uses optical fiber, optical switches and random resampling techniques to achieve rapid laser pulse computer data acquisition. According to the experiment, when the pumping and dye laser pulse time matching is the best, their peaks almost coincide, thus proposed to pulse peak value as a measuring point to delay the pulse width to exclude the impact of pulse width changes, and the use of quadratic polynomial Curve-fitting data processing techniques to exclude measurement disturbances at the peak delay time, enabling nanosecond-level measurements and closed-loop control of pumping laser pulse timing. Manual single-step control of the control system error and delay measurement error is less than ± 0.2 ns, closed-loop control accuracy of ± 1 ns.