FP cavity adjustable filter

Abstract

The invention discloses an FP cavity adjustable filter, which comprises a pair of a first flat plate and a second flat plate which are mutually spaced and parallel. A plurality of isolation piles withthe same height are uniformly spaced at the peripheral position of a first reflecting film on the first flat plate; a plurality of piezoelectric ceramics are further fixedly installed on the peripheries of the isolation piles, the bottoms of the piezoelectric ceramics are fixedly connected to the first flat plate, and the tops of the piezoelectric ceramics are free ends; through holes are formedat positions right opposite to the piezoelectric ceramics on the second flat plate, the tops of the piezoelectric ceramics are inserted into the through holes; compensation blocks are further fixedlyinstalled on the second flat plate, one ends of the compensation blocks are fixedly connected to the second flat plate, and the other ends of the compensation blocks are inserted into the through holes and in contact with the tops of the piezoelectric ceramics, and the problems that the cavity length uniformity of an existing FP cavity adjustable filter is difficult to guarantee and the damage resistance is poor are solved.

Description

technical field [0001] The invention relates to the field of optoelectronic equipment, and more specifically, to an FP cavity tunable filter. Background technique [0002] Infrared tunable filters can flexibly select the required infrared spectral components from the infrared wide spectrum for detection or analysis. Application prospect. Due to the use of electrical signals for tuning, it has the characteristics of fast selection speed and flexible selection mode. It can work in single-point, continuous scanning, random scanning and multi-point modes. It is suitable for multi-spectral imaging and hyperspectral imaging. The existing infrared tunable filters include acousto-optic filters, liquid crystal filters and FP cavity filters, among which the FP cavity filter has the advantages of simple structure, large aperture, high spectral resolution and optical The characteristic of high efficiency has been used in frequency selection of lasers and ultra-narrow-band tunable filt...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned technologies, and propose a FP-cavity tunable filter to solve the problem that the FP-cavity tunable filter in the prior art is difficult to ensure the uniformity of the cavity length due to the large diameter, and the external oil gas or dust The entry of the FP cavity will easily lead to the problem that the anti-damage ability of the FP cavity to high-power laser becomes worse

Images