Herein, precision recording of indented dots and lines in As₁₀Se₉₀ and As₂S₃ chalcogenide glass films by a focused laser beam is demonstrated and the kinetics and mechanisms of mass transfer under illumination are studied. Due to inhomogeneous intensity distribution and local heating of the film at the focal point, the beam at rest produces an indentation whose depth increases with time and laser power. Illumination by a moving beam leads to formation of groves whose morphology depends on the beam speed and power. At low light intensities, formation of the indentations occurs in the solid phase, due to photoinduced radial diffusion of the film constituents coupled with electrons and holes created by light. The two main driving forces present are: 1) a lateral steady‐state electric field formed due to different mobilities of electrons and holes and 2) driving force of thermodiffusion (Soret effect). At high light intensities, formation of the indentations and grooves occurs with the participation of a liquid phase, with an additional mechanism of viscous flow caused by a gradient in surface tension. However, the contribution of viscous flow mechanism is small compared with diffusion mass transfer. Calculated profiles of the indentations and grooves are in a good agreement with experimental data.

中文翻译：

---

硫族化物玻璃薄膜中的激光记录：传质的驱动力和动力学

在此，精确记录As ₁₀ Se ₉₀和As ₂ S _3中的凹点和线通过聚焦激光束对硫属化物玻璃薄膜进行了演示，并研究了在光照条件下传质的动力学和机理。由于不均匀的强度分布和薄膜在焦点处的局部加热，静止光束会产生压痕，压痕的深度会随着时间和激光功率的增加而增加。移动光束的照明会导致形成凹槽，其形态取决于光束速度和功率。在低光强度下，由于膜成分与由光产生的电子和空穴耦合的光诱导径向扩散，在固相中形成凹痕。存在的两个主要驱动力是：1）由于电子和空穴的迁移率不同而形成的横向稳态电场，以及2）热扩散的驱动力（索雷特效应）。在高的光强度下，在液相的参与下形成凹口和凹槽，并且由于表面张力的梯度而导致了粘性流动的附加机理。但是，与扩散传质相比，粘性流动机理的贡献很小。压痕和凹槽的计算轮廓与实验数据非常吻合。