飞秒激光离焦抽运熔融石英产生超连续白光的实验研究
Off-focus generation of strong super-continuum emission in fused silica using high power femtosecond laser pulses
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摘要: 利用飞秒激光在熔融石英介质中传输产生能量达数毫焦、波长范围覆盖400-900nm且光谱分布较为均匀的超连续白光,实验过程中将熔融石英介质离焦放置以避免被击穿.研究了入射激光能量以及介质离焦距离对超连续白光特性的影响.结果表明采用高能量的入射激光脉冲离焦抽运介质的方法能够有效避免介质击穿损伤并提高超连续白光脉冲的能量输出.Abstract: We report on the generation of millijoules supercontinuum, which covers waveband from - 400 nm to - 900 nm wavelength, by intense femtosecond laser pulse propagating in 3 mm thick fused silica. The fused silica is placed in front of the geometric focus of incident laser pulse to prevent the breakdown. The dependences of supercontinuurn spectrum on incident pulse energy and off-focus distance of medium are investigated in detail. Our work demonstrates that strong supercontinuum can be generated using off-focus pump of solid transparent medium with energetic incident pulses.
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