A Method for Precise Alignment of Multiple Gradient Filters

Abstract

The method provided by the present invention, which can be used for the precise alignment of multiple gradient filters, determines the channel baseline center wavelength of the gradient filter by making an alignment scale and testing the spectral center wavelength of the filter at a position corresponding to the alignment scale λ1, obtain the scale values ​​of the two alignment scales when the central wavelength is λ1, and obtain the passband position of the central wavelength λ1 according to the scale values ​​when the central wavelength is λ1, as the first reference line of the gradient filter , obtain the second reference line according to the first reference line, and determine the working area of ​​the optical filter through the first reference line and the second reference line, and perform the optical filter according to the working area of ​​the optical filter Cut, and then use the same method to determine the working area of ​​another gradient filter, and make an alignment mark, according to the alignment mark, embed the cut filter in the area determined by the alignment mark for alignment and fixation , so as to realize the precise alignment of the positions of the same spectral channels of multiple filters.

Description

technical field [0001] The invention relates to the technical field of optical thin film devices, in particular to a method for precise alignment of multiple graded filters. Background technique [0002] The gradient filter is a new type of thin film filter realized by a multilayer wedge-shaped thin film structure, which has continuously changing spectral characteristics at different positions, so it can be used as a new type of dispersion element. Gradient filters can be divided into linear gradient filters and circular gradient filters according to different gradient methods. Due to their small size, light weight, and high integration, they can be used in the design of highly integrated and portable spectral application systems. Thin-film filters are based on the principle of interference between multi-layer dielectric films, and different spectral corresponding characteristics can be achieved according to different designs. The spectral characteristics of the filter depe...

AI Technical Summary

Problems solved by technology

Gradient filter is a new type of thin film dispersion device. It is extremely difficult to make a gradient filter with a wide working range. At present, there is no publicly reported technical method for the precise alignment of multiple gradient filters.

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