Transmissive and reflective film absorption measurement method and device for thermal lens

A technology of measuring device and measuring method, which is applied in the field of sensitivity and resolution, and improves the linearity of measurement, and can solve problems such as large experimental errors and extremely high requirements for optical path adjustment.

Inactive Publication Date: 2005-06-29
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Among them, the photothermal deflection measurement method and the photothermal displacement measurement method have high requirements for the adjustment of the optical path in the experiment, and the influence of human factors is relatively large, so the experimental error is relatively large.

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  • Transmissive and reflective film absorption measurement method and device for thermal lens
  • Transmissive and reflective film absorption measurement method and device for thermal lens
  • Transmissive and reflective film absorption measurement method and device for thermal lens

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with accompanying drawing:

[0048] The definition and absorption measurement method of thermal lens transflective signal in the present invention-thermal lens transflective film absorption measuring method are as follows:

[0049] a. Based on the thermal lens thin film absorption measurement method and the surface thermal lens thin film absorption measurement method, the reflected and transmitted detection laser center light intensity signal is measured at the same time, and the thermal lens transmission and reflection signal S RT defined as:

[0050] S RT = I R - I T I 0 = CA P pump in:

[0051] I R : When the pump l...

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Abstract

This invention relates to a thermal lens reflective film absorption measurement method and its device, which are based on thermal lens film absorption measurement method and surface thermal lens film absorption to simultaneously measure the detecting laser center light intensity signals I#-[R] and I#-[T] reflected and transmitted in the light thermal lens effect. It is to make the light intensity received by two photoelectricity detectors equal by adjusting the amplifying times of the photoelectricity detector or fixing attenuator in the reflection and transmission light paths. In this way it gets the thermal lens reflection and transmission signals S#-[RT]ú¢(I#-[R]-I#-[T])/I#-[0] which is at a proportion with the film absorption rate in a large range.

Description

Technical field: [0001] The invention relates to a method for thin film absorption measurement, in particular to a method for improving the linearity, sensitivity and resolution of measurement. Background technique: [0002] The existence of film absorption loss will not only affect the performance of the film, but also an important cause of laser damage to the film. Therefore, accurate and quantitative measurement and analysis of film absorption is required. [0003] The traditional measurement methods of thin film absorptivity can be roughly divided into direct measurement such as calorimetry and indirect measurement such as photometry and spectrometry, but the measurement accuracy is only up to 10 -3 The order of magnitude cannot meet the technical index requirements of today's optical development. [0004] The application of photoacoustic photothermal technology to the measurement of weak absorption of optical materials is a rising technology at home and abroad in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/31
Inventor 范树海贺洪波
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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