0.4-10.0 micrometer ultra-wide spectrum dichroic filter

A technology of dichroic mirror and wide spectrum, applied in the field of optical system, can solve the problems that dichroic mirror is difficult to meet the requirements of color separation, limit the use range of ordinary dichroic mirror, unstable performance of dichroic mirror, etc., and achieve excellent spectrum. and mechanical stability, fast change, wide spectral range effect

Inactive Publication Date: 2009-07-01
NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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Problems solved by technology

[0002] Due to the narrow spectral width of the reflection area and the transmission area of ​​ordinary dichroic mirrors, in some cases where wider reflection areas and transmission areas are required, it is difficult for ordinary dichroic mirrors to meet the requirements of color separation.
[000

Method used

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  • 0.4-10.0 micrometer ultra-wide spectrum dichroic filter
  • 0.4-10.0 micrometer ultra-wide spectrum dichroic filter

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[0022] The method for designing an ultra-wide spectrum dichroic mirror of the present invention is as follows:

[0023] The working spectrum range of the ultra-wide spectrum dichroic mirror is 0.4~10.0μm. In order to reduce the absorption of light waves by the substrate and coating material, the substrate and coating material with a small extinction coefficient within the working spectrum range should be selected as far as possible. Therefore, barium fluoride is used for the coating substrate, titanium dioxide is used for the high refractive index material, and cryolite is used for the low refractive index material.

[0024] Ordinary dichroic mirrors have very narrow spectral widths in the reflection zone, so the way to broaden the reflection band is to set a long pass (0.5HL0.5H) 5 On the multilayer film system, two long-wave pass film systems with different center wavelengths are superimposed on 1.2 (0.5HL0.5H) 5 , 0.8 (0.5HL0.5H) 5 At the same time, in order to reduce the corru...

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Abstract

The invention discloses a 0.4-10.0 microns ultra-wide spectrum dichroic mirror. The ultra-wide spectrum dichroic mirror utilizes barium fluoride as a film coating substrate, utilizes titanium dioxide and cryolite as film coating materials, and expands a reflecting belt through overlapping a plurality of long-wave passed film systems with different wave lengths. A design film system of the ultra-wide spectrum dichroic mirror is BaF2/1.2(0.5HL0.5H)5(0.5HL0.5H)5/0.8(0.5HL0.5H)5/2L/Air, wherein the H and L are respectively 1/4 wave-length optical thicknesses of a high refractive index material and a low refractive index material, and the center wave-length is 550nm, the result proves that the average reflectance of the ultra-wide dichroic mirror is 98.93% in the waveband of 0.4-0.748 mu m, and the average transmittance is 86.64% in the waveband of 1.5-10.0 mu m. The ultra-wide spectrum dichroic mirror has the advantages of high reflectance in a reflecting area, wide spectrum range in the reflecting area, changing fast from the reflecting area to a transmitting area, high transmittance in the transmitting area, and having excellent spectra and mechanics stability. Further, the invention can be applied to optical systems in the field of spectroanalysis instruments, projecting cameras, special illuminating devices, television cameras, aerospace engineering and the like.

Description

technical field [0001] The invention relates to an optical film dichroic mirror, relates to a 0.4-10.0 micron ultra-wide spectrum dichroic mirror, and belongs to the field of optical systems. Background technique [0002] Due to the narrow spectral width of the reflection area and transmission area of ​​ordinary dichroic mirrors, it is difficult for ordinary dichroic mirrors to meet the color separation requirements in some cases where wider reflection areas and transmission areas are required. [0003] In addition, as the conditions of use of optical thin film devices become more stringent, traditional dichroic mirrors have the disadvantages of unstable performance in harsh environments and are easily affected by the environment, which also limits the scope of use of ordinary dichroic mirrors. [0004] It is urgent to develop an ultra-wide spectrum dichroic mirror that not only has the characteristics of high reflectivity in the reflection region and high transmittance in t...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B1/02
Inventor 陈焘刘宏开熊玉卿马勉军李锦磊
Owner NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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