中红外超连续谱在氟化物光纤中的产生

Mid-IR supercontinuum generation in fluoride fiber

为获得高功率全光纤中红外超连续谱，采用自制的掺Er锁模光纤激光器作为种子源，激光经过两级放大至1．67W，泵浦氟化物光纤，获得光谱覆盖1000~2400nm的超连续光谱；光谱宽度随着泵浦功率的增加而展宽，当输出功率达到1．21W时，转换效率为72％，并且产生的超连续谱被强烈的调制，在多个波长点处谱功率密度调制到0mW／nm，但调制波长与泵浦功率无关。

In order to obtain high power all-fiber mid-IR supercontinuum source, the fluoride fiber is pumped by homemade erbium-doped mode-locked fiber laser after two amplifiers to 1.67 W. The supercontinuum from 1 000 nm to 2 400 nm is obtained. The spectrum of the supercontinuum is gradually broadening with the increase of the pump laser power. The output power and the conversion efficiency are 1.21 W and 720//00 respectively. Experimental results show that supercontinuum has a strong spectrum modulation, and the power spectrum density decreases to 0 mW/nm at certain spectrum points which does not depend on pump power.