Abstract

The absorption of high-power visible or near-IR laser radiation by free electrons is calculated using the modified resonance approximation. The probabilities W_exc of intraband transitions at which the electron energy changes by ℏ(ω ± ω_l), where ω is the frequency of light and ω_l is the frequency of longitudinal optical phonons involved in the process, are determined. It is shown that specific electron–phonon Rabi oscillations at a frequency of Ω_R may take place, and that the light is absorbed only up to the moment of time at which the first maximum τ₁ on the dependence W_exc(t) is reached, where t is the time elapsed from the beginning of the laser pulse. It is shown that, in the case of prebreakdown light intensities, processes of high orders in the field of the light wave affect substantially W_exc, τ₁, and Ω_R.

中文翻译：

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晶体中自由电子对强光的吸收：带内电子–Phonon Rabi振荡

摘要

使用改进的共振近似，可以计算出自由电子对高功率可见光或近红外激光辐射的吸收。概率W¯¯ _EXC带内跃迁的在其中的电子能量由ℏ改变（ω±ω_升），其中ω是光，ω的频率_升是过程中涉及的纵向光学声子的频率，被确定。结果表明，在Ω的频率特定的电子-声子拉比振荡_ř可能发生，并且该光被吸收只到τ是第一最大值为其中的时间的时刻₁的依赖W¯¯ _EXC（吨达到） ，其中Ť是从激光脉冲开始经过的时间。其示出的是，在预击穿光强度的情况下，在光波的领域中对高订单的处理影响基本上W¯¯ _EXC，τ ₁和Ω _ř。