0.4-10.0 micrometer ultra-wide spectrum dichroic filter

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...

AI Technical Summary

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.

[0003] In addition, as the use conditions 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.

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