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设计并实现了一种放大纳秒激光脉冲的高稳定的激光二极管(LD)抽运Nd∶YLF再生放大器。为了获得高稳定的输出,再生放大器工作在饱和状态。此时,再生放大器输出稳定性最好,而且注入激光脉冲能量波动引起的输出激光脉冲波动被抑制。由于增益饱和效应,再生放大器输出脉冲出现时域波形失真,附加后缀脉冲能够减弱时域波形失真。放大器工作波长1053nm,工作频率1Hz。输入240pJ的3ns方波激光脉冲,输出激光脉冲能量4.2mJ,总增益大于107,不稳定度小于1%(均方根),方波扭曲1.33。为3ns方波激光脉冲引入其本身幅度0.75倍的后缀脉冲,输出激光脉冲方波扭曲由1.33降至1.17。
A highly stable laser diode (LD) pumped Nd:YLF regenerative amplifier is designed and implemented to amplify nanosecond laser pulses. In order to obtain high-stability output, regenerative amplifier is working in saturation. At this moment, the output stability of the regenerative amplifier is the best, and the fluctuation of the output laser pulse due to the fluctuation of the injected laser pulse energy is suppressed. Due to the gain saturation effect, the output waveform of the regenerative amplifier shows the waveform distortion in the time domain, and the additional suffix pulse can weaken the waveform distortion in the time domain. Amplifier working wavelength 1053nm, operating frequency 1Hz. Input 240pJ 3ns square wave laser pulse, the output laser pulse energy of 4.2mJ, the total gain greater than 107, less than 1% instability (root mean square), square wave distortion 1.33. A 3-ns square wave laser pulse is introduced with a suffix pulse of 0.75 times its own amplitude. The square wave distortion of the output laser pulse is reduced from 1.33 to 1.17.