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

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 in particular relates to an electric tuning holographic polymer dispersed liquid crystal 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 system resolution. 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 rotation of the ...

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