双声光二维Q开关提高连续Nd:YAG激光关断损耗研究

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

分析了单声光器件、超声场相互平行和相互正交的两声光Q开关器件衍射损耗,给出正常布喇格衍射的超声场相互平行和相互正交的双声光Q开关器件衍射效率的表达式。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,超声场相互平行双声光Q开关的关断损耗比单声光器件提高了1倍多,而超声场相互正交双声光Q开关的关断损耗比单声光器件提高了2倍多,能够有效的关断大功率固体连续激光。

The switch-losses of one Qswitch, 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 normal Bragg 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 parallel, the switch-loss is more than one time than one AO Q-switch, and more than two times than one AO Q-switch when acousto-field are perpendicular each other. Douhle acous- to-optic devices two-dimensional Q-switch can efficiently improving the switch-loss of CW Nd：YAG laser. Ke