Narrow-band interference filter

A narrow-band interference and optical filter technology, applied in the field of optical filters, can solve the problems of design without drift compensation, reduced pass-band transmittance, and waveform deterioration, and achieves high pass-band transmittance and oblique incidence. Small drift and good optical performance

Inactive Publication Date: 2013-05-08
HARBIN INST OF TECH
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Problems solved by technology

It can be seen that it is difficult to obtain a narrow-band interference filter with both high pass-band transmittance and excellent stop-band cut-off depth at present.
[0004] In addition, the narrow-band interference filter has an oblique incidence effect. When the beam is obliquely incident, the pass-band will be short-

Method used

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Embodiment Construction

[0019] Such as figure 1 As shown, the narrow-band interference filter of the present invention includes a substrate 10 made of quartz glass (JGS1), and the upper and lower surfaces of the substrate 10 are coated with a main peak film system 20 and a truncated peak film system 30 respectively. , wherein: the main peak film system 20 is a four-half-wave film system, and the four-half-wave film system refers to a film system that adopts four resonant cavities connected in series, which can improve the square coefficient and the stop band cut-off depth of the narrow-band interference filter of the present invention; The truncation peak film system 30 is a truncation peak film stack, and the truncation peak film stack refers to a periodic structure formed by a cut-off film system.

[0020] The main peak film system 20 is a low refractive index silicon dioxide film layer (by SiO 2 material), high refractive index niobium pentoxide film layer (made of Nb 2 o 5 material) alternatel...

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Abstract

The invention discloses a narrowband interference filter which comprises substrate which is made of quartz glass materials. The upper surface and the lower surface of the substrate are respectively plated with a main peak film system and a section secondary peak film system, wherein the main peak film system is a four half-wave film system and the section secondary peak film system is a section secondary peak film pack. The narrowband interference filter is good in optical performance, high in transmittance of a passing band, deep in stopping band ending, small in oblique incidence drifting, high in stability, high in reliability, in addition, the passing band approaches to a rectangle, disturbance to identification of an active marker caused by sunlight and other stray light can be eliminated effectively when the narrowband interference filter is matched with the active marker to used, and identification accuracy is high.

Description

technical field [0001] The invention relates to an optical filter, in particular to a narrow-band interference optical filter. Background technique [0002] The design and development of interference filters (thin film interference filters) generally select substrate materials and film materials according to performance requirements, and use vacuum coating method to alternately form high or low refractive index with a certain thickness on the side of the substrate. The metal film-dielectric-metal film, or all-dielectric film, to form a multi-level series solid Fabry-Perot interferometer. [0003] At present, when designing narrow-band interference filters, the main considerations are usually the pass-band center wavelength, pass-band width and pass-band transmittance, and increasing the pass-band transmittance will generally reduce the stop-band cut-off depth, and vice versa. In general, if the transmittance of the passband is higher than 90%, the cutoff depth of the stopba...

Claims

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Application Information

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IPC IPC(8): G02B5/28G02B1/00G02B1/10
Inventor 李金宗朱兵李冬冬周东平
Owner HARBIN INST OF TECH
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