组合抽运DPL声光调Q特性研究

端-侧面组合抽运方案是提高DPL调Q脉冲峰值功率和压缩脉冲宽度的有效技术途径。借助给出的一组端-侧面组合抽运DPL声光调Q实验结果，依据调Q速率方程，理论分析了组合抽运光的空间分布对调Q脉冲特性的影响，数值计算结果与实验结果一致。实验和理论研究发现：组合抽运时的脉冲宽度明显小于侧面抽运时的脉冲宽度，峰值功率明显高于侧面抽运时的峰值功率。实验和分析结果表明：在总抽运功率和抽运结构确定的情况下，端面抽运光功率在总抽运功率中的占有率越大，脉冲宽度越窄，脉冲峰值功率越高。通过调整端面抽运光功率占有率，改变组合抽运光的空间分布，可以实现对DPL调Q脉冲特性的控制。

Acoustooptic Q-switching performance of composite-pumped DPL

The end and side composite pumping is an effective way to raise the Q-switching peak power and to compress the pulse width of the Q-switched pulse in a DPL. The influence of the space distribution of the composite pumping light on the characteristics of the Q-switching pulse was analyzed in theory by a set of acoustooptic Q-switching experiment results in an end and side composite-pumped DPL and the Q-switching velocity equations. The numerical calculation results are consistent with the experimental results. It is found from the results of experiment and numerical calculation that the pulse width of a composite-pumped DPL are obviously narrower than that of a side-pumped DPL, and the pulse peak power is remarkably higher than that of the side-pumped DPL. The experiment and analysis results show that the larger the occupancy of the end-pumping power is, the narrower the pulse width and the higher the pulse peak power will be, when the total pumping power and the pumping structure are fixed. Therefore, the characteristics of the Q-switching pulse can be controlled by changing the space distribution of the composite pumping light through adjusting the occupancy of the end-pumping power.