纳秒激光脉冲时空动力学的精细计量

R. Diaz, R. Courchinoux, J. Luce, C. Rouyer, J. Rullier, J. Natoli, L. Lamaignère
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引用次数: 1

摘要

种子纳秒调q Nd:YAG激光器在不稳定谐振腔和可变反射镜下工作,因为它们代表了稳定和可重复的光-物质相互作用实验的有用光源而被广泛使用。此外,在大多数装置中,基本波长被转换成更高的谐波。当注入播种机关闭时,在腔内发生随机纵向模式跳动,导致脉冲的时间分布发生强烈变化。产生的峰值可以比等效种子脉冲的最大值高十倍。这种强烈的时间不相干性会在非种子脉冲的焦平面上产生空间不相干性,从而导致数十μ rad的瞬时角位移。这种效应在变频后更为明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Refined metrology of spatio-temporal dynamics of nanosecond laser pulses
Seeded nanosecond Q-switched Nd:YAG lasers working with an unstable resonator and a variable-reflectivity-mirror are widely used for they represent useful sources for stable and repeatable light-matter-interaction experiments. Moreover, in most setups, the fundamental wavelength is converted to higher harmonics. When the injection seeder is turned off, random longitudinal mode beating occurs in the cavity, resulting in strong variations of the temporal profile of the pulses. The generated spikes can then be ten times higher than the maximum of equivalent seeded pulses. This strong temporal incoherence is shown to engender spatial incoherence in the focal plane of such unseeded pulses leading to an instantaneous angular displacement of tens of µrad. This effect is even more pronounced after frequency conversion.
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