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首页> 外文期刊>Infrared physics and technology >Computing method for evaluating the absorption coefficient of infrared optical elements
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Computing method for evaluating the absorption coefficient of infrared optical elements

机译：评估红外光学元件吸收系数的计算方法

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The paper presents a new computing method for the bulk absorption coefficient of an optical component. The method is based on the general solution of the heat diffusion equation calculated for the case where the component is irradiated by a laser beam. From the practical point of view this new method simplifies the measuring process of the absorption coefficient because it requires, as input data, the value of the temperature rise in a single point at one moment. To establish the most suitable moment and position for the measuring point in order to reduce the errors, this method was numerically simulated on GaAs and ZnSe samples irradiated with a TEM00 CO2 laser beam. An error analysis was conducted to find the required precision for the experimental measurements to obtain accurate data. To experimentally test this method, an experimental setup, based on a laser calorimeter was developed and the absorption coefficient of four ZnSe samples was evaluated. The results were proved to be in good agreement to the results provided by the pulse and gradient method mentioned in ISO 11551, applied in the same experimental conditions as the proposed method. (C) 1998 Elsevier Science B,V. All rights reserved. [References: 7]
机译：本文提出了一种新的计算光学元件体积吸收系数的方法。该方法基于针对在部件被激光束照射的情况下计算出的热扩散方程式的一般解。从实际的角度来看，这种新方法简化了吸收系数的测量过程，因为它需要将输入数据在某一时刻的单点温度升高值作为输入数据。为了建立最适合测量点的力矩和位置以减少误差，该方法在用TEM00 CO2激光束照射的GaAs和ZnSe样品上进行了数值模拟。进行误差分析以找到实验测量所需的精度，以获得准确的数据。为了实验测试该方法，开发了一种基于激光量热仪的实验装置，并评估了四个ZnSe样品的吸收系数。事实证明，该结果与ISO 11551中提到的脉冲和梯度方法所提供的结果非常吻合，并在与该方法相同的实验条件下应用。 （C）1998 Elsevier Science B，V。版权所有。 [参考：7]

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