Pulse duration (msec long pulse) how?

Hi all,

Im researching vascular lasers and I cant find info on how "long pulse" lasers manage to create millisecond pulses. Are they just Continuous wave lasers with some sort of switch that only stays on for milliseconds?

I know Q-switched xenon lamp pumped tattoo removal lasers work in microseconds and use capacitors.

If anyone can explain this it will be a big help.

Thanks.