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光学薄膜吸收损耗的绝对测量对光学薄膜的优化设计与应用至关重要,以光热失调技术实现光学薄膜吸收损耗的绝对测量为研究目的,采取连续激光加热的方式,理论与实验相结合,提出了一种利用反射率或透射率、温度变化和加热光功率之间的3个线性关系,实现吸收损耗绝对测量的方法。针对设计的高反射光学薄膜实验样品,获得样品对加热光功率的吸收率绝对值为1.64×10-2,并分析了影响测量精度的主要因素。研究表明,提出的方法可以实现光学薄膜吸收损耗的绝对测量,特别适合于具有较大反射率或透射率温度系数的样品,测量准确性依赖于样品表面温度理论模型的建立和实验测量的精度,研究结果为光热失调技术的进一步应用提供了理论和实验支持。
The absolute measurement of the absorption loss of optical thin film is very important for the optimal design and application of the optical thin film. For the purpose of absolute measurement of the absorption loss of the optical thin film by using the photothermal mismatch technique, a continuous laser heating method is adopted, and the theory and experiment are combined A method that uses the three linear relationships between reflectivity or transmittance, temperature change, and heating power to achieve absolute measurement of absorption loss. According to the design of high reflective optical thin film experiment sample, the absolute value of the absorptivity of the sample to the heating optical power is 1.64 × 10-2, and the main factors affecting the measurement accuracy are analyzed. The results show that the proposed method can achieve the absolute measurement of the absorption loss of the optical thin film and is particularly suitable for the samples with large reflectivity or transmittance temperature coefficient. The accuracy of the measurement depends on the establishment of the theoretical model of the sample surface temperature and the accuracy of the experimental measurement, The results provide theoretical and experimental support for the further application of photothermal misadjustment technology.