拉曼-纳斯衍射声光Q开关的实验研究

Acoustooptic Q-Switch Based on Raman-Nath Diffraction

实验研究了拉曼-纳斯(R-N)衍射的声光相互作用长度与声波光波参数之间的关系,确定了最佳声光相互作用长度。在此基础上,分别设计以水和TeO2晶体为声光介质的R-N衍射Q开关器件。测量了器件的衍射效率、衍射角和插入损耗等参数。应用TeO2晶体开关器件调制长脉冲Nd:YAG/KTP激光器,当重复频率为10 kHz时得到了脉宽约为200 ns的绿激光输出。

A series of experiments on the interaction length between the sound and the light with Raman-Nath diffraction is reported.Then the optimum interaction length at certain sound frequency is defined.Based on those results,the devices of acoustooptic Q-switch,made of H2O or TeO2 as the medium,in terms of Raman-Nath diffraction are respectively designed.The diffraction and the loss of the devices are tested.Finally the device made of TeO2 is employed to modulate a long pulsed Nd：YAG/KTP laser.The modulated pulse width is measured as about 200 ns at the repetition frequency of 10 kHz.