Flat laser beam splitting film based on composite material and its design method

A composite material and beam splitting film technology, applied in optics, optical components, instruments, etc., can solve the problems of increasing the thickness of the film, and achieve the effect of increasing the laser damage threshold, reducing requirements, and high refractive index

Active Publication Date: 2022-04-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited coating materials available in nature, in order to achieve a specific transmittance (the ratio of the transmitted beam intensity T to the reflected beam intensity R), it is often necessary to design an irregular film structure, which increases the difficulty of film thickness control

Method used

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  • Flat laser beam splitting film based on composite material and its design method
  • Flat laser beam splitting film based on composite material and its design method
  • Flat laser beam splitting film based on composite material and its design method

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0042] Taking an incident angle of 45 degrees, s polarization component, and a transmittance of 50±1% at 1053 nm as an example, a flat-plate laser beam splitter film based on composite materials and its design method of the present invention are illustrated.

[0043] The design method specifically includes the following steps:

[0044] 1) Parameter setting: the design transmittance value T of the laser beam splitting film D =50%, beam incident angle θ=45°, incident beam is s-polarized component, at 1053nm center wavelength, quartz substrate refractive index n S =1.4378, HfO 2 The refractive index of the material n A =1.9088, Al 2 o 3 The refractive index of the material n B = 1.5910, SiO 2 The refractive index of the material n C=1.4212, the initial film structure is S|dL(HL) g HmL|A, where S represents the substrate, H represents the high refr...

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Abstract

A flat-plate laser beam splitting film based on composite materials and its design method, based on a given regular film structure, using a single material A with a refractive index greater than 1.8 and a single material B with an optical band gap greater than 6.0eV and a single low Refractive index material C designs the laser beam splitting film, calculates the period numbers a and b of the film layer in the film structure required to achieve the target transmittance, and then determines the composite material M composed of material A and material B and the single low refractive index material C When designing the laser beam splitting film, the value range of the period number g of the film layer (a

Description

technical field [0001] The invention relates to the technical field of optical thin films, and relates to a composite material-based flat laser beam splitting film and a design method thereof. Background technique [0002] Beam splitters are used to separate incident light into reflected light and transmitted light. They are widely used in various optical systems and are an important component of optical research and use systems. The commonly used beam splitter has two structures: one is to deposit the thin film on a transparent plate to form a flat beam splitter; the other is to coat the film on the inclined surface of a 45° right-angle prism, and then glue a same Shaped prisms that make up a cemented cube beamsplitter. [0003] Flat-plate beam splitters have the advantages of easy preparation of large size, low cost, and flexible design and fabrication, and are widely used in laser systems, especially large-scale laser devices. An ideal laser beam splitting film not only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/11G02B27/00G02B27/28
CPCG02B1/11G02B27/0012G02B27/283
Inventor 朱美萍杜文云李静平赵泽成刘天宝易葵邵建达
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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