Linear gradient optical filter of 0.4 to 1.1 micrometers and preparation method thereof

Abstract

The invention relates to a linear gradient optical filter of 0.4 to 1.1 micrometers and a preparation method thereof, which belongs to the field of optical systems. The linear gradient optical filter takes K9 glass as a film coating substrate and takes titanium dioxide and silicon dioxide as a film coating material; and the design coating of the linear gradient optical filter is K9 / (LHLH2LHLH)3 / Air, wherein H and L are respectively the titanium dioxide and the silicon dioxide with 1 / 4 wavelength optical thickness of a high and lower refractive index material; a linear gradient optical filter line is provided with 10 channels on a wave band of 0.4 to 1.1 micrometers, the relative bandwidth is 6.8 percent, and any position at the middle of a substrate only transmits one kind of light with a specific wavelength within 0.4 to 1.1 micrometers. The linear gradient optical filter is combined with an array detector, optical systems and mechanic systems of instruments can be simplified, and the reliability and stability of the instruments are improved so that the instruments are miniaturized and convenient to carry; and more importantly, the linear gradient optical filter can identify different optical radiations simultaneously and quickly detect different spectral radiance at the same time.

Description

technical field [0001] The invention relates to a 0.4-1.1 micron linear gradient filter and a preparation method thereof, belonging to the field of optical systems. Background technique [0002] Ordinary optical filters are generally in the form of a single channel. When multiple channels are required, splicing technology is often used to make multi-channel optical filters. The manufacturing process of this combination filter is complicated, and its performance is also unstable, so it is difficult to meet the requirements of high reliability and long life. [0003] Compared with combined filters, linear gradient filters do not require stitching, have high integration, relatively simple manufacturing process, passband can be designed arbitrarily in principle, stable performance, and can be precisely coupled with detectors. It is the development of ultra-narrow-band filters. of a trend. Contents of the invention [0004] The purpose of the present invention is in order to ...

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Problems solved by technology

[0004] The purpose of the present invention is in order to solve the problem that the central wavelength of the optical filter on the substrate changes linearly with the position of the substrate, and only passes through the light of a specific wavelength within 0.4-1.1 microns at any position in the middle of the substrate. And propose a 0.4-1.1 micron linear gradient filter

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