6 Q-switched Fiber Laser
6.1 Introduction: Working Principle
Several applications require a pulsed laser. One of the most effective ways of producing these high-energy pulses is using a Q-switched fiber laser. Q-switching is done by temporarily switching the quality factor of the laser cavity. The quality factor is defined as the ratio between the energy stored in the resonator and the energy lost in a return cycle. In practice, this is done by periodically modulating the losses inside the cavity. High loss corresponds to the low Q-factor of the cavity and low loss corresponds to the high Q-factor of the cavity. When the pump source is switched on, the loss in the cavity is maintained at a high value. Population ...
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