A LDA pumped highly stable Nd∶YLF ring laser is developed. With an output laser intensity induced negative feedback control of resonator gain, a quasi-continuous prelase with duration of ～100 μs is established, then Q-switch during this prelase. Because the prelase mode is well matched to the resonator eigenmode and with certain intensity, the build up time and intensity of Q-switched pulse are very stable. Experimental results show that intensity instability of output Q-switched pulse doesn′t exceed 4.3%, and time jitter does not exceed ±4 ns.

A novel method is presented for compensating deflection in temporal-spatial transform pulse shaping system, using single-mode optical fiber instead of a second electrooptic deflector. By changing the width of filtering slit, pulse duration ranging from 740 ps to 4.5 ns is observed, and output beam is of good quality. This novel method has reduced requirements on electrooptic deflector and simplified the whole system.

提出了时空变换脉冲整形系统中光束复原的一种新方法:用单模光纤代替通常时空变换法中的第二个电光偏转器.当改变调制狭缝的宽度时,获得了脉宽在740 ps～4.5 ns连续变化的整形脉冲,而且输出光束质量好.此方法降低了对关键元件电光偏转器的要求,提高了可靠性,简化了系统.

成功研制了一台激光二极管列阵(LDA)抽运的高稳定Nd:YLF环形激光器.用输出激光强度负反馈控制谐振腔的增益,建立了准连续的～100 μs宽预激光状态,然后在此预激光基础上调Q.由于预激光模式与谐振腔固有模式一致并且具有一定强度,调Q脉冲的建立时间和幅度都很稳定.实验结果为:输出调Q脉冲强度起伏不超过4.3%,时间抖动小于±4 ns.

Laser pulse is quickly deflected by LiNbO3 electro-optics deflector which is driven by avalanche transistor pile, thus a stable laser pulse output ( the pulse width is ns in scale) is gained, the instability of which is decreased from 10%(RMS) to 4%(RMS)compared with the single-longitudinal-mode Q-switched laser pulse output of the oscillator. It indicates that the amplitude stability of shaping laser pulse is improved greatly.

The working principle of double cascade connected or parallel connected electro-optics deflectors used in the temporal-spatial transformation instrument is introduced and the ability to produce shaping laser pulse of it is theoretically analyzed. The laser pulse shaping experiment with double cascade connected or parallel connected electro-optics deflectors is performed. The result conform to the theoretical analysis which proved that the ability to obtain shaping laser pulse is improved greatly with a double cascade connected electro-optics deflectors.

A LDA pumped Nd:YLF regenerative amplifier has been developed, which works at wavelength of 1053 nm and repetition rate of 1 Hz. It can produce laser pulses of 2 mJ energy, 4ns width and base transverse mode TEM 00 . Total gain of 1×10 7 is reached, and pulse to pulse energy fluctuation didn′t exceed ±4 7% (peak). Experiment setup and detailed results are presented in this paper.

利用雪崩管堆驱动LiNbO3电光偏转器对激光脉冲进行快速偏转,实现幅度稳定的纳秒整形激光脉冲;激光脉冲振幅不稳定度从振荡器输出的单纵模调Q激光脉冲的10%(RMS)降低到4%(RMS),大大改进了纳秒量级整形激光脉冲幅度稳定性.

研制了一台激光二极管列阵(LDA)抽运的Nd:YLF再生放大器。再生放大器工作波长1053 nm，重复频率1 Hz，输出4 ns宽基横模TEM00激光脉冲的能量为2 mJ。总放大倍数达到了1×10 7，输出能量稳定性优于±4.7%(峰值)。给出了再生放大器的实验装置和有关实验结果。

介绍了在时空变换装置中用两个电光偏转器串接和并接的工作原理，从理论上分析了用其提高激光脉冲整形的能力，进行了激光脉冲削波实验，实验结果与理论分析一致。用两个偏转器串接后，大大提高产生整形激光脉冲的能力。