Review of Some Photothermal Effects
Review of Some Photothermal Effects
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一些光热效应的回顾
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Whinnery
中科院分区：
文献类型：
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作者：
J. Whinnery
当激光束穿过有损耗材料时，吸收的能量产生热梯度，热梯度又产生折射率梯度。然后可能发生各种效应，包括聚焦或散焦（热反射效应）、光束失真、自相位调制或声波的产生。这是简单的效应，原则上容易理解，但令人惊讶的是它们对损失的敏感性。当低功率光束通过高透明度的材料时，可能会产生一些重要的效应，有些是有用的，但最不希望的。由于这些效应的多样性和重要性，也因为查尔斯·汤斯在他们观察的早期阶段提出了一个关键的建议，在这篇论文中简要回顾一下似乎是合适的。早期的评论[1]，但后来有了发展，特别是在光谱应用中。重点将放在液体中的影响，但大多数要点也适用于气体和固体。
When a laser beam passes through a lossy material, the absorbed energy produces thrmal gradients, which in turn produce gradients of refractive index. There may then occur a variety of effects including focusing or defocusing (thermal lense effects), beam distortion, self-phase modulation, or generation of acoustic waves. This are simple effects, easy to understand in principle, but the surprising aspect is their sensitivity to loss. Important effects, some useful but most undesirable, may occur with low-power beams passing through materials of a high degree of transparency. Because of the variety and importance of these effects, and because Charles Townes made a key suggestion in the early stages of their observations, it seems appropriate for a brief reviewin this Festschrift. An earlier review was given [1], but there have been later developments, especially in spectroscopic applications. The emphasis will be on the effect in liquids, but most of the points apply to gases and solids also.