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Double channel filter with regulatable channel relative position and its regulating method

A technology of relative position and adjustment method, applied in the direction of filters, etc., can solve the problems of limiting the application range of dual-channel filters and difficult to independently adjust the relative position.

Inactive Publication Date: 2005-03-02
TONGJI UNIV
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  • Abstract
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Problems solved by technology

[0009] The multi-channel bandpass filter based on the Fabry-Perot etalon and the heterojunction structure of the above-mentioned one-dimensional photonic crystal are difficult to independently adjust the relative position of each channel, thus limiting the application range of the dual-channel filter

Method used

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  • Double channel filter with regulatable channel relative position and its regulating method
  • Double channel filter with regulatable channel relative position and its regulating method
  • Double channel filter with regulatable channel relative position and its regulating method

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Embodiment Construction

[0027] Hereinafter, the present invention will be further described by taking a dual-channel one-dimensional photonic crystal as an example in conjunction with the accompanying drawings.

[0028] Depend on figure 1 It can be seen that the position of the channel moves to the long-wave direction with the increase of the thickness of the middle layer c. However, the relative spacing between channels is always the same and cannot be changed. figure 2 It is a schematic diagram of the bisymmetric structure based on the Fabry-Perot structure of the present invention. image 3 It shows that as d increases from 0.3L to 0.9L, the channel on the right moves from 650.65nm to 708.1nm, but the channel on the left remains unchanged at the original position. Depend on Figure 4 It can be seen that as c increases from 1.4H to 2.0H, the channel on the left moves from 538.7nm to 600nm, but the channel on the right remains unchanged at the original position. exist Figure 5 , the double sy...

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Abstract

The invention provides a design method that can independently regulate the relative position of the two channels in a double-channel light filtering piece, adopting a bisymmetric structure based on Fabry-Perot etalon. It is different from traditional narrow-band light filtering piece in regulating independently the positions of the two channels by changing the thickness of several middle layers, respectively, and thus overcomes the position coherence phenomenon caused by the position regulation of channel. It introduces the design of the light filtering piece and concrete structure as well as the calculated spectrum characteristic of the double-channel band-pass light filtering piece, etc. It can be applied in the fields of optical detecting apparatus, space technique and so on.

Description

technical field [0001] The invention relates to an optical filter device, in particular to a dual-channel optical filter with adjustable channel relative positions and an adjustment method thereof. It has application prospects in optical instruments, astronomy, remote sensing, etc. Background technique [0002] Traditional multi-channel bandpass filters generally have the following two types: [0003] 1. Multi-channel bandpass filter based on Fabry-Perot etalon [0004] The most typical multi-channel bandpass filter is the Fabry---Perot etalon structure. The filter is a symmetrical structure, with reflective layers at both ends and a spacer layer in the middle. After multiple reflections of the reflective layer, by properly selecting the physical thickness of the spacer layer, this structure can obtain a bandpass with multi-channel transmission characteristics. filter, but since the positions of all channels are related to the thickness of this spacer layer, the position ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20
Inventor 吴永刚田国勋王占山林小燕
Owner TONGJI UNIV
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