We experimentally investigated the third-order nonlinear optical response of absolute ethanol around 1550 nm. The real and imaginary parts of third-order susceptibilities are distinguished by Z-scan method, which demonstrated that absolute ethanol exhibited saturable absorption and self-defocusing behaviors with nonlinear refractive index n2∼−10−14 m2/W. In addition, the experimental results via self-phase modulation method also verified the comparable nonlinear optical response of absolute ethanol. This work is expected to provide insights for the nonlinearities of organic solvents, and may broaden the potential of cost-effective nonlinear optoelectronic devices.

中文翻译：

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乙醇中 1550 nm 附近的光自散焦

我们通过实验研究了无水乙醇在 1550 nm 附近的三阶非线性光学响应。Z-scan方法区分了三阶磁化率的实部和虚部，表明无水乙醇表现出饱和吸收和自散焦行为，非线性折射率为n2∼-10-14 m2/W。此外，通过自相位调制方法的实验结果也验证了无水乙醇具有可比性的非线性光学响应。这项工作有望为有机溶剂的非线性提供见解，并可能扩大具有成本效益的非线性光电器件的潜力。