We characterize both nonlinear refraction and absorption in a vertical-external-cavity surface-emitting laser (VECSEL) as a function of pump irradiance over the whole range of lasing wavelengths. We observe an approximately linear decrease in magnitude for both nonlinear refraction and nonlinear absorption with optical pumping when the thermally induced shift of the lasing wavelength is considered. Our results are of particular significance for understanding self-modelocking of VECSELs which might be driven by nonlinear lensing.

中文翻译：

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半导体盘式激光器中波长和泵浦功率相关的非线性折射和吸收

我们将垂直外腔面发射激光器 (VECSEL) 中的非线性折射和吸收表征为整个激光波长范围内泵浦辐照度的函数。当考虑激光波长的热致位移时，我们观察到具有光泵浦的非线性折射和非线性吸收的幅度近似线性下降。我们的结果对于理解可能由非线性透镜驱动的 VECSEL 自锁模具有特别重要的意义。