Supercontinuum source using Q-switched all-fiber nanosecond pulsed laser based on acousto-optical modulation

The laser system based on Q-switched technique of acousto-optical modulation is all-fiber using passive fibers as media to generate supercontinuum, which can output different-width supercontinuum only by adjusting the pump power and repetition rate. With higher pump power, lower repetition rate, longer passive fiber, a wider supercontinuum is obtained. The supercontinuum range can be extended by splicing a passive fiber, and the supercontinuum width exceeds 700 nm when the passive fiber is 200 m long at 1 kHz modulation frequency, 1.0% duty and 4.68 W pump power. The all-fiber nanosecond pulsed laser has simple configuration with fully fiberized cavities without the need for free-space components, allowing for robust and compact system designs. Its parameters can be easily adjusted by the acousto-optical modulator, which greatly extends the applications in industrial deployment.