A shutter device (as a filter or chemical-filled cell) that prevents a laser from emitting radiation until the desired internal energy is reached in order that a short high-energy pulse is obtained.

Q 开关；光量开关(使晶体激光器产生一种极短促而高能量脉冲的设备)。

To control (a laser or laser medium) with a Q-switch.

用Q开关使晶体激光器发射高能脉冲。