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首页> 外文期刊>Journal of the Optical Society of America, B. Optical Physics >Numerical aperture dependence of damage and supercontinuum generation from femtosecond laser pulses in bulk fused silica
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Numerical aperture dependence of damage and supercontinuum generation from femtosecond laser pulses in bulk fused silica

机译：飞秒激光脉冲在块状熔融石英中损伤和超连续谱产生的数值孔径依赖性

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摘要

Competing nonlinear optical effects are involved in the interaction of femtosecond laser pulses with transparent dielectrics: supercontinuum generation and multiphoton-induced bulk damage. We measured the threshold energy for supercontinuum generation and bulk damage in fused silica using numerical apertures (NAs) ranging from 0.01 to 0.65. The threshold for supercontinuum generation exhibits a minimum near 0.05 NA and increases quickly above 0.1 NA. For NAs greater than 0.25, we observe no supercontinuum generation. The extent of the blue broadening of the supercontinuum spectrum decreases significantly as the NA is increased from 0.01 to 0.08, showing that weak focusing is important for generating the broadest supercontinuum spectrum. Using a light-scattering technique to detect the onset of bulk damage, we confirmed bulk damage at all NAs studied. At a high NA, the damage threshold is well below the critical power for self-focusing. (c) 2006 Optical Society of America.
机译：飞秒激光脉冲与透明电介质的相互作用涉及竞争性的非线性光学效应：超连续谱的产生和多光子引起的整体损伤。我们使用范围为0.01至0.65的数值孔径（NA）测量了熔融石英中超连续谱产生和整体破坏的阈值能量。超连续谱生成的阈值在0.05 NA附近显示最小值，在0.1 NA以上迅速增加。对于大于0.25的NA，我们没有观察到超连续谱的产生。随着NA从0.01增加到0.08，超连续谱光谱的蓝色加宽幅度显着降低，这表明弱聚焦对于生成最宽的超连续谱光谱很重要。使用光散射技术检测整体破坏的开始，我们确认了所有研究的NA的整体破坏。在高NA下，损伤阈值远低于自我聚焦的临界功率。 （c）2006年美国眼镜学会。

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