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Optical nonlinearities in direct and indirect band gap crystals on the Z-scan technique with nanosecond laser

机译:纳秒激光Z扫描技术上的直接和间接带隙晶体的光学非线性

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摘要

The free carrier optical nonlinearities in direct and indirect band gap crystals have been investigated by the use of a single beam Z-scan technique. The values of two-photon absorption coefficient (β), nonlinear index n_2(ω), the total free carrier absorption cross-section (σ_(ab)) and the change in the refractive index per unit carrier density (σ_(nr)) are determined in both direct and indirect band gap crystals. Smaller values of (β) and (σ_(ab)) in the case of indirect band gap crystals have been attributed to phonon assisted transitions, while the smaller value of n_2(ω) and (σ_(nr)) is due to the rise in saturation taking place in the absorption.
机译:通过使用单束Z扫描技术已经研究了直接和间接带隙晶体中的自由载流子光学非线性。双光子吸收系数(β),非线性指数n_2(ω),总自由载流子吸收截面(σ_(ab))的值以及每单位载流子密度的折射率变化(σ_(nr))的值在直接和间接带隙晶体中均确定。在间接带隙晶体的情况下,(β)和(σ_(ab))的较小值归因于声子辅助跃迁,而n_2(ω)和(σ_(nr))的较小值归因于上升在吸收中发生饱和。

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