Photon absorption of conduction-band electrons and their effects on laser-induced damage to optical materials
Photon absorption of conduction-band electrons and their effects on laser-induced damage to optical materials
复制标题
导带电子的光子吸收及其对光学材料激光损伤的影响
DOI：
10.1103/physrevb.61.16522
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发表时间：
2000
影响因子：
3.7
通讯作者：
Yu
中科院分区：
文献类型：
--
作者：
Tian;Hong Chen;Yu
用量子场方法计算了可见光和紫外光强激光辐照下光学透明材料导带电子的单光子和双光子吸收率。当同时考虑CBE的空穴辅助线性吸收和非线性吸收时，从激光场的总能量增益率将提高2倍。因此，雪崩主导的损伤过程的结合强度降低了约三分之一。雪崩率不仅包括与激光强度成比例的项，而且还包括与激光强度的平方成比例的项以及与激光强度和空穴密度的乘积成比例的项。目前的结果给出了较低的损伤阈值比以前的。
The one-and two-photon absorption rates of conduction-band electrons (CBE) in optically transparent materials under the radiation of high-intensity lasers at visible and ultraviolet wavelengths are calculated by the quantum field approach. When both hole-assisted linear absorption and nonlinear absorption of CBE are considered, the rates of total energy gain from the laser field will be enhanced by a factor of 2. The bounding intensity for the avalanche dominating damage process thus decreases by about one-third. The avalanche rate includes not only the term proportional to the laser intensity, but also the terms proportional to the square of the laser intensity and to the product of the laser intensity and hole density. The present result gives a lower damage threshold than previous ones.