声光调Q纳秒脉冲全光纤超连续谱光源

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

基于声光调Q技术的纳秒脉冲光纤激光超连续谱光源系统为全光纤结构,使用普通的传能光纤作为超连续谱的产生介质,通过改变泵浦功率和调制频率,可获得不同的超连续谱输出。实验结果表明:泵浦功率越大,调制频率越低,传能光纤越长,光谱展宽越宽。当传能光纤为200m、调制频率为1kHz、占空比为1.0%、泵浦功率为4.68W时,获得谱线宽度超过700nm的超连续谱输出。该系统可作为超连续谱光源的一种参考方案。

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 adiusting the pump power and repe- tition rate. With higher pump power, lower repetition rate, longer passive fiber, a wider supercontinuum is obtained. The super- continuum 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 sys- tem designs. It＇s parameters can be easily adjusted by the acousto-optical modulator, which greatly extends the applications in in- dustrial deployment.