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Three-channel filter with independently regulatable channel relative position and its regulating method

A technology of relative position and adjustment method, applied in the direction of optical filters, etc., can solve problems such as limiting the application range of dual-channel and multi-channel optical filters, and difficulty in independently adjusting relative positions

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

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

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  • Three-channel filter with independently regulatable channel relative position and its regulating method
  • Three-channel filter with independently regulatable channel relative position and its regulating method
  • Three-channel filter with independently regulatable channel relative position and its regulating method

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Embodiment Construction

[0029] The specific method of position design and adjustment of the three-channel optical filter of the three-symmetric structure of the present invention will be described below in conjunction with the accompanying drawings.

[0030] Depend on figure 1 It can be seen from the figure that with the increase of the thickness of the middle layer c, the positions of the two channels move to the long-wave direction, and the relative interval between the channels is always the same and cannot be changed. Fig. 2 is a schematic diagram of a double symmetrical structure based on the Fabry-Perot structure of the present invention. image 3 Among them, as e increases from 3.1L to 3.6L, the channel on the right moves from 701.19nm to 720.35nm, but the two channels on the left remain basically unchanged in their original positions. Figure 4 Among them, as d increases from 0.2H to 0.7H, the middle channel moves from 635.09nm to 696.53nm, but the two channels on both sides remain basically...

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Abstract

The invention provides a design method that can independently regulate the relative position of the three channels in a triple-channel light filtering piece, adopting a triple-symmetrical structure on the basis of Fabry-Perot structure. It is different from traditional narrow-band light filtering piece in regulating independently the positions of the three channels by changing the thickness of several middle layers, respectively, and thus overcomes the position coherence phenomenon caused by the position regulation. It introduces the design of the light filtering piece and concrete structure as well as the regulating method and the calculated spectrum characteristic of the triple-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 three-channel optical filter with adjustable channel 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 changes ...

Claims

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Application Information

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