Abstract: A series of experiments on the Q-switching result in different resonators and different locations in the mlti-direction side-pumped DPL has been done. It can be seen from experimental results that the Q-switch location achieving the smallest pulse width, the biggest peak power and the largest Q-switching efficiency is exactly near the oscillating light waist. By discussing this phenomenon, we find the affecting pattern of the oscillating light on output pulse, and learn the influence of pump light on the Q-switching result further. The conclusion of this paper can be used in the optimal design of the acoustics-optical Q-switched multi-direction side-pumped DPL.

Key words: diode-pumped solid-state laser, side-pump, acousto-optic Q-switching