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Ultraviolet exposure method of volume holographic Bragg reflector

A Bragg mirror and exposure method technology, applied in the optical field, can solve the problems of difficult synchronization of environmental vibration, multiple fixing and operation of devices, and complexity, and achieve the effects of precise control, avoidance of uncertainty, and accurate cycle.

Pending Publication Date: 2021-01-08
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the existing method, the Mach-Zehnder interference method is generally used, that is, the two-beam interference is used and the spatial frequency of the interference fringe is changed by adjusting the angle between the two beams, and the Bragg angle is changed by adjusting the placement angle of the grating material. , this method has a wide range of applicability, but the disadvantage is obvious that there are too many devices and they all need to be fixed separately and the operation is too complicated, and the determination of the required interference period can only be determined by manual adjustment, and the environmental vibrations of each device are difficult to synchronize. It is difficult to ensure the accuracy of exposure

Method used

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  • Ultraviolet exposure method of volume holographic Bragg reflector
  • Ultraviolet exposure method of volume holographic Bragg reflector

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Experimental device such as figure 1 As shown, the recording material used to make the grating is photothermorefractive PTR glass, and the surface area of ​​the PTR glass sample used is 7mm X 7mm, and the thickness is 2mm. A He-Cd laser with output power of 50mW is used as the ultraviolet exposure light source of the grating, and the output wavelength is 325nm, and the refractive index of the grating material at this wavelength is 1.4817. The output ultraviolet laser is firstly expanded (the magnification of the beam expander is adjustable from 1X to 10X), and a small hole diaphragm is placed on the focal plane of the beam expander for spatial filtering. The stability and uniformity of the spot largely determine the Fabrication properties of volume gratings.

[0032] UV exposure of volume holographic Bragg gratings is carried out as follows:

[0033] (1) Fix a double prism with side angle α.

[0034] (2) Use a beam of ultraviolet laser with a wavelength of 325nm to e...

Embodiment 2

[0042] Experimental device such as figure 2 As shown, the recording material used to make the grating is photothermorefractive PTR glass, and the surface area of ​​the PTR glass sample used is 7mm X 7mm, and the thickness is 2mm. A He-Cd laser with output power of 50mW is used as the ultraviolet exposure light source of the grating, and the output wavelength is 325nm, and the refractive index of the grating material at this wavelength is 1.4817. The output ultraviolet laser is firstly expanded (the magnification of the beam expander is adjustable from 1X to 10X), and a small hole diaphragm is placed on the focal plane of the beam expander for spatial filtering. The stability and uniformity of the spot largely determine the Fabrication properties of volume gratings.

[0043] UV exposure of volume holographic Bragg gratings is carried out as follows:

[0044] (1) Fix a double prism with side angle α.

[0045](2) Use a beam of ultraviolet laser with a wavelength of 325nm to e...

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Abstract

The invention discloses an ultraviolet exposure method of a volume holographic Bragg reflector, which comprises the following steps of: (1) enabling a beam of parallel ultraviolet light to verticallyenter the bottom surface of a biprism, emitting two beams of parallel light from wave splitting surfaces on the two side surfaces of the biprism, and forming interference fringes in front of the biprism by the two beams of emitted parallel light; and (2) irradiating the interference fringes on PTR glass, recording the interference fringes, and forming a volume holographic Bragg grating on the PTRglass within T time. The exposure method is specially designed for the volume holographic Bragg reflector, beam splitting surface interference is carried out through one biprism, PTR glass is used forrecording interference fringes, the period of the volume holographic Bragg grating can be accurately determined by controlling the base angle of the biprism, manual adjustment is not needed, and theexposure efficiency is improved. Meanwhile, the period deviation caused by instability of double-beam interference and the uncertainty of the interference fringe period caused by environmental vibration are also avoided.

Description

technical field [0001] The invention relates to the field of optics, in particular to an ultraviolet exposure method for a volume holographic Bragg reflector. Background technique [0002] At present, the writing of volume holographic Bragg gratings is generally completed in two steps. The first step is to irradiate two laser beams and interfere with each other to form interference fringes. PTR glass is placed at the position of the interference fringes, so that the characteristics of the material change periodically to form a grating. "Latent phase"; the second step is to perform microcrystallization heat treatment process on the PTR glass after ultraviolet irradiation, so as to form a volume holographic Bragg grating whose refractive index is permanently modulated. The process of UV exposure determines the spatial frequency and Bragg angle of the volume holographic Bragg grating, which ultimately determines the final characteristics of the grating. [0003] For the existi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G03F7/20
CPCG02B5/1857G03F7/70408
Inventor 陈亮蒋宇飞赵士龙徐时清郭凌伟徐玮鑫
Owner CHINA JILIANG UNIV
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