| 摘要 |
The invention relates to a method for operating a laser system in a Q-switched mode, thereby generating a train of at least two subsequent laser pulses (p 1 ). The laser system has a laser resonator (1) with a laser medium (2) and an electro-optical modulator (3). The electro-optical modulator (3) comprises an EOM crystal (9), wherein the EOM crystal (9) has, when subjected to acoustic ringing, a characteristic ringing time (to). The EOM crystal (9) is driven by modulator voltage pulses (p m ) having a modulator voltage pulse duration (t m1 ). The modulator voltage pulse duration (t m1 ) is at least approximately equal to the characteristic ringing time (to) multiplied by an integer factor. The rising edge ("on") of the voltage pulse (p m ) generates an acoustic wave and the falling edge ("off") of the voltage pulse generates a counter-propagating acoustic wave. Proper choice of the duration (t ml ) of the voltage pulse, i.e. multiple integer of the reziprocal of the ringing ftrequency (t 0 ), results in destructive interference of the two acoustic waves and vanishing acoustic ringing. |
