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Multi-pass-band and ultra-narrow-band optical filter based on prism coupling

An optical filter and multi-passband technology, applied in the field of guided wave optics, can solve the problems of complex device structure and troublesome preparation process, and achieve the effects of good narrowband properties, low sideband transmittance, and convenient use.

Inactive Publication Date: 2017-06-27
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these devices have complex structures and troublesome fabrication processes.

Method used

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  • Multi-pass-band and ultra-narrow-band optical filter based on prism coupling
  • Multi-pass-band and ultra-narrow-band optical filter based on prism coupling
  • Multi-pass-band and ultra-narrow-band optical filter based on prism coupling

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Embodiment Construction

[0038]The multi-pass-band narrow-band optical filter based on prism coupling designed in the present invention includes: a composite transparent body (hereinafter referred to as a composite body) of a cylindrical or square cylindrical body and a planar light waveguide. The cylinder or square cylinder is cut at a certain angle along the longitudinal axis, and a planar optical waveguide is prepared on a cut surface according to the transmission center wavelength. The planar optical waveguide is composed of films with different layers and thicknesses. Then, the two cutting bodies are pasted together along the cut surface, fixed, and sealed to form a composite body. Both ends of the complex are coated with broadband anti-reflection film. The narrow-band filter of the present invention specifically includes: collimated incident light beam 1, antireflection coating layer 2 and 8 on the end face, cylinder or square cylinder cutting body 3 and 7, planar optical waveguide, by low refra...

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Abstract

The invention belongs to the technical field of guided wave optics, and specifically relates to a multi-pass-band and ultra-narrow-band optical filter based on prism coupling. The multi-pass-band and ultra-narrow-band optical filter based on prism coupling includes a composite transparent body (for short, complex) of a cylinder or a square cylinder and a planar optical waveguide, wherein the cylinder or the square cylinder is cut in a longitudinal axis by a certain angle; a planar optical waveguide is prepared on one tangent plane according to the transmission center wavelength, and is formed by thin films with different layers and thickness; the two cutting bodies are fitted and fixed along the tangent plane, and are sealed to form a complex; and the two end surfaces of the complex are each plated with a broadband reflection reducing coating. The single or multiple guided mode waveguide of the multi-pass-band and ultra-narrow-band optical filter based on prism coupling can respectively form a plurality of pass bands with ultra narrow bands in the purple light area, the blue light area, the green light area and the red light area in the visible light areas, wherein the half height width of the pass band can achieve the picometer (10-12m) magnitude; and the center wavelength of each band can realize fine tuning through change of angle. The filtering energy band in the multi-pass-band and ultra-narrow-band optical filter based on prism coupling has the advantages of having symmetrical band shape, being extremely low in the sideband transmittance, having superb narrowband property, being easy to be manufactured into a large aperture device, and being specifically suitable for spectral measurement with high precision.

Description

technical field [0001] The invention belongs to the technical field of guided wave optics, and in particular relates to a multi-passband and extremely narrowband optical filter based on prism coupling. Background technique [0002] Narrowband optical filters are indispensable optical devices in optical communication and spectral technology. There are many technologies that can produce narrow-band optical filtering, such as optical thin films, interference filters, and guided-mode resonant filters based on grating structures. However, most of these devices have complex structures and troublesome fabrication processes. [0003] The present invention proposes that the narrow-band optical filter is based on the prism-coupled dual-guided-mode resonance filtering technology, corresponding to the guided-mode resonance technology of the grating structure, but the device structure of the present invention does not contain a grating, so the preparation of sub-wavelength The complex ...

Claims

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Application Information

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IPC IPC(8): G02B6/34G02B6/293
CPCG02B6/34G02B6/29389
Inventor 刘建华陶李
Owner FUDAN UNIV
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