为了运用主振功率放大技术获得纳秒量级的高功率密度激光脉冲,设计了一种运用于主振功率放大的半导体激光种子源,通过编程可输出多种形状光脉冲,并采用主动脉冲外形控制技术提高了输出光脉冲的波形质量。实验中研制了高速大电流驱动模块和可编程多种调制波形发生器,并采用了1064nm量子阱分布反馈的大功率半导体激光器。结果表明,该种子源脉冲光功率优于200mW、动态范围优于20dB、脉冲宽度40ns~1μs和重复频率0MHz~5MHz可调,可编程控制输出多种波形。

In order to obtain nanosecond high peak power optical pulses from a master oscillator power amplifier(MOPA),a semiconductor seed laser was designed in the MOPA system.It can be programmed and output various optical pulses and its output quality was improved with adaptive pulse shape control technology.In the experiment,a high-speed and high-current drive module and a programmable arbitrary modulating waveform generator and a 1064nm QW-DFB(quantum well distributed feedback) high-power diode laser were adopted.The experimental results show that this programmable semiconductor pulse seed laser which can output many shapes,while the peak power is more than 200mW,the dynamic range is better than 20dB,the pulse width is adjustable from 40ns to 1μs,and a pulse frequency is adjustable from 0MHz to 5MHz.