Parameter determination method for multi-channel wavelength-variable polarization interference filter

An interference filter and parameter determination technology, which is applied in the field of optical devices, can solve problems such as long wavelength switching time, single channel, and inability to continuously tune frequency, and achieve the effects of strong environmental adaptability, large optical aperture, and small birefringence
CN109632089AActive Publication Date: 2019-04-16深圳市合飞科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
深圳市合飞科技有限公司
Publication Date
2019-04-16

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Abstract

The present invention provides a parameter determination method for a multi-channel wavelength-variable polarization interference filter. The method includes the following steps that: output light intensity is determined, a crystal thickness value and a first angle combination which satisfy a polarization interference condition are searched according to the output light intensity, wherein the first angle combination includes included angles between the optical axes of various crystals and the polarization axis of a polarizer; the initial wavelength of the polarization interference filter is determined according to the crystal thickness value and the first angle combination; a desired output wavelength is determined, and a second angle between the normal direction of a phase retardation crystal component and a polarized light transmission path direction is calculated according to the desired output wavelength; the number of channels of the polarization interference filter is determinedaccording to the phase delay amount of the phase retardation crystal component; and parameters are set, so that multi-channel wavelength-variable output is realized.
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Description

technical field

[0001] The invention relates to the technical field of optical devices, in particular to a method for determining parameters of a multi-channel variable-wavelength polarization interference filter. Background technique

[0002] In optical information collection and processing, optical filtering and spectrum analysis play an extremely important role. The optical filter device can select a specific spectrum or a combination of multiple separated spectrums to pass through, and is a key device for optical communication, spectral remote sensing imaging, and medical spectral diagnosis.

[0003] At present, optical filter devices are mainly interference filters prepared by the principle of multi-film interference, or absorption filters prepared by dichroic materials. Interference filters and absorption filters are characterized by mature technology, high transmittance and excellent spectral response characteristics, but fixed wavelength is a shortcoming of filters,...

Claims

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