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Photothermal detuning for absorption measurement of optical coatings

机译：光热失谐用于光学涂层的吸收测量

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摘要

A simple and sensitive photothermal technique-photothermal detuning, in which the spectral shift of an optical coating caused by absorption-induced temperature rise is used to measure the photothermal signal-and its application for the absorption measurement of coated optical components are developed theoretically and experimentally in detail for the first time to the best of our knowledge. The theoretical description of the photothermal detuning signal with a continuous-wave modulated laser beam excitation is presented. Experiments are conducted with a highly reflective coating used at 532 nm to measure the photothermal detuning signal and to evaluate the absorption at 532 nm by detecting the spectral shift with a probe beam at a wavelength of 632.8 nm. By optimizing the incident angle of the probe beam, the amplitude of the photothermal detuning signal is maximized. Good agreement is obtained between the experimental results and the theoretical predictions. (c) 2008 Optical Society of America.
机译：一种简单灵敏的光热技术—光热失谐，将吸收引起的温度升高引起的光学涂层的光谱位移用于测量光热信号，并在理论和实验上开发了其在涂层光学元件的吸收测量中的应用据我们所知，这是首次进行的详细分析。提出了光热失谐信号的连续波调制激光束激励的理论描述。使用在532 nm处使用的高反射涂层进行实验，以测量光热失谐信号并通过使用波长为632.8 nm的探测光束检测光谱偏移来评估532 nm处的吸收。通过优化探测光束的入射角，可以使光热失谐信号的振幅最大。实验结果与理论预测值吻合良好。 （c）2008年美国眼镜学会。

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