Quasi-continuous wave fiber lasers are now part of the equation for modern applications. They can operate in both CW and high-peak power pulsed modes. Unlike traditional CW lasers, for QCW Fiber Lasers Come of Age Wall-plug efficiency, high PPR are just two benefits of new laser technology FABRICATING which peak and average power are always the same in CW and CW/ modulated regimes, QCW lasers’ peak power in pulsed mode is increased by a factor of 10 over the average power.