Volume Bragg grating wavelength beam combiner based on photo-thermal refractive glass and preparation method thereof

Abstract

The invention discloses a volume Bragg grating wavelength beam combiner based on photo-thermal refractive glass and a preparation method thereof, and the preparation method comprises the steps: constructing the channel parameters of a volume Bragg grating in the beam combiner through a coupling wave theory and a vector circle method, then according to a double-beam interference principle, obtaining an interference included angle of the two beams of recording light in the medium and obtaining incident angles thetaoi'and thetari 'of the two beams of recording light in the medium; then calculating to obtain incident angles thetaoi and thetari of the two beams of recording light outside the medium; finally, the photo-thermal refractive glass is exposed based on the incidence angles theta oi and theta ri, and a volume Bragg grating channel corresponding to the wavelength lambda w is written; after the volume Bragg grating is subjected to thermal development treatment, two light-passing surfaces are subjected to crystal polishing and then plated with antireflection films, and the volume Bragg grating wavelength beam combiner is manufactured. The volume Bragg grating wavelength beam combiner prepared by the invention has the advantages of simple and compact structure, high environmental adaptability, high aging resistance and high laser damage resistance, and can meet the requirement of high-power laser wavelength beam combination.

Description

technical field [0001] The invention relates to the technical field of optical element manufacturing, in particular to a volume Bragg grating wavelength combiner based on photothermal refractive glass and a preparation method thereof. Background technique [0002] In order to improve the output quality and output power of laser beams, people have begun to develop various optical components that can be used for wavelength grouping. Among them, Wavelength Division Multiplexing (WDM) is widely used in the field of communication. Due to its unique structure, high linear density, high spatial frequency and high diffraction efficiency, volume phase holographic grating WDM has become a WDM complex. Research hotspots in the field. At present, the volume phase holographic grating in WDM is made by fabricating a volume phase holographic transmission grating and a reflective grating based on double cadmium gelatin on both sides of the BK7 substrate, and then encapsulating the grating ...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a volume Bragg grating wavelength combiner based on photothermorefractive glass and its preparation method, aiming at solving the problem of existing dichromate gelatin wavelength combiner The preparation process is complicated, and the prepared wavelength beam combiner has the problems of poor environmental adaptability, easy aging, and poor resistance to laser damage

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