双声光二维Q开关提高Nd∶YAG激光器关断损耗

Improving Switch Loss of Nd∶YAG Laser by Double Acousto-optic Devices Two-dimensional Q-switch

分析了单声光器件、超声场相互平行和正交两声光Q开关器件衍射损耗 ,根据声光互作用理论 ,给出拉曼 奈斯衍射的超声场相互正交和平行的两声光Q开关器件衍射损耗的表达式。采用功率分配器保证两声光Q开关的同步和有效功率驱动。Nd∶YAG激光器的实验结果表明 ,超声场相互正交两声光Q开关的关断损耗比单声光器件提高近 3倍、比超声场相互平行两声光Q开关器件提高 1倍。

The switch-losses of one Q-switch, two Q-switches in acousto-field perpendicular or parallel are analyzed. According to the theory of acousto-optic (AO) interaction, the formulas of diffraction loss of two AO Q-switches, which acousto-field are perpendicular or parallel one another, in Raman-Nath diffraction are derived. The power divider for ensuring two AO Q-switch synchronization and effective power driving is designed. The calculation results are satisfied with Nd∶YAG laser experimental results. It is shown that two AO Q-switches, which acousto-field are perpendicular each other, switch-loss is nearly three times large than one AO Q-switch, one time large than the two AO Q-switches which acousto-field are parallel.