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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.
One of the best example application of pulse width modulation is to use PWM for motor speed control. This technique of modifying the width of the pulse to get the desired duty cycle is called âPulse width modulationâ.