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为提高表面热透镜薄膜吸收测量仪的灵敏度,在表面热透镜衍射理论基础上,通过数值模拟给出了探测激光腰斑半径、探测激光腰斑到样品表面距离、样品到探测光纤端面距离等仪器参数的优化方法.经优化调整后该仪器能达到优于0·1ppm量级的薄膜吸收率测量灵敏度.
In order to improve the sensitivity of the surface thermal lens thin film absorption measuring instrument, based on the theory of surface thermal lens diffraction, the radian of the detecting laser waist spot, the distance from the detecting laser waist spot to the sample surface, the distance from the sample to the detecting fiber end surface, Parameter Optimization Method The instrument is optimized to achieve film absorbance measurement sensitivities better than 0.1 ppm.