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A mode-locked laser is capable of emitting extremely short pulses on the order of tens of picoseconds down to less than 10 femtoseconds. These pulses will repeat at the round trip time, that is, the time that it takes light to complete one round trip between the mirrors comprising the resonator.
current pulser, you can short the output and watch the current with a suitable monitoring circuit. The pulser is not damaged by a short. Many applications involve single-junction laser diodes and LEDs with a forward voltage drop of just a few volts. If you are driving a laser diode stack (a group of series-connected laser diodes), be sure to specify a driver with a sufficiently high compliance voltage. Note that some current pulser models have an adjustable compliance voltage limit or an. adjustable overvoltage detector.