Bragg body grating monochromator prepared from electric tuning holographic polymer dispersed liquid crystal (HPDLC)

A technology of Bragg bodies and dispersed liquid crystals, applied in the field of electro-optic functional materials and optical communications, to achieve the effect of reducing the size of the grating, reducing the size of the system, and realizing intelligent control

Inactive Publication Date: 2012-10-24
FUDAN UNIV
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Problems solved by technology

In the liquid crystal layer, the photopolymerization process causes the liquid crystal molecules to align mainly along the Bragg vector direction, that is, parallel to the front and rear conductive glass

Method used

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  • Bragg body grating monochromator prepared from electric tuning holographic polymer dispersed liquid crystal (HPDLC)

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Embodiment 1

[0021] High-efficiency Bragg volume grating prepared by holographic polymer dispersed liquid crystal (HPDLC), the overall thickness of the grating is less than 2mm, and the grating area is 5×5mm 2 , grating period 1.1μm. When the light is guided into the spectrometer by the input fiber connector (1), it is collimated by the collimating lens (2), and enters the holographic Bragg volume grating (3) at a certain angle with the normal line of the grating surface. If the incident angle makes a certain wavelength (λ) satisfies the Bragg condition, then the light of this wavelength will be maximally diffracted by the holographic Bragg volume grating (3), and exit at the same angle as the normal of the grating (located on the same side as the normal of the incident light). The result is as figure 1 Shown in the light path diagram. If the grating electric drive control switch (4) is turned on, so that the drive signal source (5) is connected to the two electrodes of the Bragg volume ...

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Abstract

The invention belongs to the field of electrooptical functional materials and optical communication, in particular to a Bragg body grating monochromator prepared from an electric tuning holographic polymer dispersed liquid crystal (HPDLC). The Bragg body grating monochromator comprises an input fiber-optical splice, a collimating lens, an HPDLC Bragg body grating, an electric driving control switch, a driving signal source, an output focus lens, an output fiber-optical splice and a transmitting light absorbing tube. By replacing a conventional plane grating by a high-efficiency Bragg body grating prepared from the holographic polymer dispersed liquid crystal (HPDLC), the invention realizes the electric tuning with wavelength selection without a mechanical tuning mechanism of a conventional plane grating monochromator and simultaneously can realize the miniaturization and computer control. The invention avoids the problems that the diffraction efficiency of the plane (scoring) grating is seriously reduced caused by moldy surface due to the dampness or unclean surface, can prolong the service life of a system, can be used as an electric tuning variable beam splitter or an optical switch or applied to the field of optical communication.

Description

technical field [0001] The invention belongs to the field of electro-optical functional materials and optical communication, and specifically relates to an electric tuning holographic polymer dispersed liquid crystal Bragg (Bragg) volume grating monochromator. Background technique [0002] The resolution of the conventional planar grating monochromator widely used at present is directly proportional to the total number of divisions of the diffraction grating used. Therefore, the larger the grating surface and the smaller the grating period, the higher the resolution of the system. Therefore, in order to ensure a certain resolution, the volume of the conventional planar grating monochromator cannot be reduced very small. At the same time, in practice, the cleanliness of the surface of the diffraction grating is very high, and there must be no staining, otherwise the diffraction efficiency will be seriously reduced. In addition, the wavelength selection is realized by the ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/18G02B6/34G02B5/18G02F1/1334
Inventor 刘建华尹德金蒲海辉高洪跃戴海涛
Owner FUDAN UNIV
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