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Channel passband relative position independently regulatable one-passband two-channel filter

A relative position, two-channel technology, applied in the direction of the filter, etc., can solve problems such as difficult to independently adjust the relative position, limit the application range of dual-channel and multi-channel filters, etc.

Inactive Publication Date: 2008-03-05
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 dual-channel and multi-channel filters

Method used

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  • Channel passband relative position independently regulatable one-passband two-channel filter
  • Channel passband relative position independently regulatable one-passband two-channel filter
  • Channel passband relative position independently regulatable one-passband two-channel filter

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Embodiment Construction

[0027] It can be seen from Figure 1 that as the thickness of the middle layer c increases, the position of the channel moves to the long-wave direction. However, the relative spacing between channels is always the same and cannot be changed.

[0028] In Figure 3, as e increases from 0.5L to 0.8L, the channel on the right moves from 684.89nm to 716.26nm, but the channel and passband on the left remain basically unchanged at the original position.

[0029] In Figure 4, as d increases from 0.15L to 0.4L, the channel in the middle moves from 631.11nm to 670.19nm, but the passband on the left and the channel on the right remain basically unchanged at their original positions.

[0030] In Figure 5, as c increases from 1.5L to 1.9L, the passband on the left moves from 546.99nm to 583.66nm, but the two channels on the right remain basically unchanged at their original positions.

[0031] In Fig. 6, starting from c=1.5L, d=0.2L, e=0.5L, c, d and e increase alternately until c=1.6L, d=...

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Abstract

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

Description

technical field [0001] The invention relates to a design method of an optical filter device, in particular to a design of a channel pass band filter. 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 of these channels are coherent. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(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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