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Wide band cut-off ultra-narrow-band filter

An ultra-narrow-band filter and ultra-narrow-band filter technology are applied in optics, optical components, instruments, etc., and can solve problems such as poor cut-off performance and difficulty in production

Active Publication Date: 2017-02-15
TIANJIN JINHANG INST OF TECH PHYSICS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This structure can widen the forbidden band of photonic crystals and achieve narrow passband effect at the same time, but the design has poor cutoff performance near the passband and is difficult to fabricate
[0004] At present, the research on the design of narrow-band filters is mainly focused on the bandwidth of a few nanometers to tens of nanometers, and the film structure mainly adopts an all-dielectric three-cavity filter structure. However, the design and preparation of narrow-band filters with a bandwidth of 1nm have not yet been developed. see the report

Method used

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Embodiment Construction

[0026] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The specific embodiment of the invention discloses a 532nm broadband cut-off (200nm-530nm and 534nm-900nm) ultra-narrowband (bandwidth ~ 1nm) optical filter, and the base material is K9 glass (cutoff below 280nm). The transmittance curve of K9 glass is as follows figure 1 shown.

[0028] The two surfaces of the substrate are designated as the A side and the B side, respectively. There is a broadband cut-off filter film on the A side of the substrate, and the cut-off bandwidth is 280nm-480nm and 580nm-900nm. The high refractive index material H is selected as Ta 2 o 5 , the low refractive index material L is chosen as SiO 2 . The refractive index of two thin film materials for different wavelengths, such as...

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Abstract

The invention belongs to the field of optical thin films and particularly relates to a wide band cut-off ultra-narrow-band filter. Through designing a wide band cut-off filtering film formed by a multilayer reflection film system at one side of a base and designing an all-dielectric two-cavity ultra-narrow-band filtering film formed by a multilayer reflection film system at the other side of the base, the wide band cut-off filtering film with the bandwidth of 1nm is realized finally.

Description

technical field [0001] The invention belongs to the field of optical thin films, and in particular relates to a broadband cut-off ultra-narrow band filter. Background technique [0002] As a device for filtering and selecting spectral lines, narrowband filters are widely used in laser technology, medical treatment, satellite remote sensing detection, optical communication technology, and high-resolution imaging systems. The commonly used narrow-band filter is the Fabry-Perot filter, which uses the intermediate coupling layer as an F-P cavity to achieve multi-beam interference, but its cut-off bandwidth is generally small. The usual practice is to use colored glass at short wavelengths To achieve the requirement of wide cut-off, but this method has two defects. First, the light at the short wavelength is absorbed by the colored glass, which is obviously not suitable for the system that needs to multiplex the short wavelength. Secondly, the colored glass is generally doped In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/28
CPCG02B5/285
Inventor 姜玉刚刘华松陈丹王利栓刘丹丹姜承慧季一勤
Owner TIANJIN JINHANG INST OF TECH PHYSICS
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