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.