Nonlinear Absorption
Nonlinear Absorption
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DOI：
10.1201/9780203912539.ch9
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
E. W. Stryland;D. Hagan
中科院分区：
文献类型：
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作者：
E. W. Stryland;D. Hagan
1790摘要非线性吸收指的是材料的光学透明度取决于照明强度的任何效应。这包括透明度增加或减少的变化。这样的过程几乎可以像双光子吸收那样瞬间发生，或者可以像光学触发的化学反应那样随着时间积累（例如，许多光致变色太阳镜中的机制）。一般来说，响应时间越快，非线性光学响应的幅度越小。因此，慢的非线性光学效应可以用太阳光观察到，而快的效应需要脉冲激光束。本文讨论了许多但绝非所有此类影响。一般来说，非线性折射伴随着非线性吸收，因为这些过程通过因果关系紧密相连。因此，这个条目是M.关于非线性折射的条目的同伴。Sheik-Bahae和M.哈塞尔贝克在该条目中，更详细地描述了因果关系。
1790 Abstract Nonlinear absorption refers to any effect in which amaterial’s optical transparency depends on the intensity of the illumination. This includes changes in which the transparency increases or decreases. Such processes can occur almost instantaneously as in two-photon absorption, or can accumulate in time as in optically triggered chemical reactions (e.g., the mechanism in many photochromic sunglasses). In general, the magnitude of the nonlinear optical response gets smaller as the response time gets faster. Thus, slow nonlinear optical effects can be observed with sunlight while fast effects require pulsed laser beams. This entry discusses many but by no means all such effects. In general, nonlinear refraction accompanies nonlinear absorption since these processes are intimately connected by causality. Thus, this entry is a companion to the one on nonlinear refraction by M. Sheik-Bahae and M. Hasselbeck. In that entry, the causal relationship is described in more detail.