Real-time test device and method for sensitivity of double-detector time division multiplexing volume holographic materials

Abstract

The invention discloses a real-time test device and method for sensitivity of double-detector time division multiplexing volume holographic materials. The device comprises a coherent light source, aninterference light path, a first photoelectric detector, a second photoelectric detector, an acquisition card and an upper computer. Through an electronic shutter in the interference light path, the whole test process is divided into periodic exposure processes and acquisition processes; during the exposure, both two beams in the two-beam interference light path are irradiated on the surface of avolume holographic material at the same time; and during the acquisition, only one beam in the two-beam interference light path is irradiated on the surface of the volume holographic material, and thephotoelectric detectors carry out data acquisition. According to the device and method, diffraction test is carried out by adoption of incident light completely consistent with the incident beams inthe exposure process, so that the high-precision matching of Bragg angles can be ensured all the time and is not influenced by the factors of inconsistent mounting, material shrinkage and the like. The wavelength used in the measurement is consistent with the recorded wavelength, so that the whole process only needs one laser, and the detection wavelength does not need to avoid the absorption spectrum areas.

Description

technical field [0001] The invention relates to the field of volume holographic materials, in particular to a device and method for real-time testing of the sensitivity of volume holographic materials with dual-detector time-division multiplexing. Background technique [0002] Volume holographic technology is regarded as one of the candidate technologies for next-generation read-only storage technology, and has received close attention from scientific research and large enterprises. The realization of volume holography technology is inseparable from high-performance volume hologram storage media, and all countries in the world are researching and developing high-performance volume hologram storage media. During the research and development of volume holographic storage media, it is necessary to measure the sensitivity of volume holographic storage media. Existing solutions usually use dual wavelengths for real-time measurement of the sensitivity of volume holographic storage...

AI Technical Summary

Problems solved by technology

[0003] (1) When there is a certain shrinkage of the storage medium, the detection light will not be able to dynamically ensure the Bragg angle matching due to the shrinkage during the real-time measurement process, which will affect the measurement results;

[0004] (2) Every time the storage medium is reinstalled, the slight error in the installation process will also affect the Bragg angle matching, thereby affecting the measurement results;

[0005] (3) When switching the type of storage medium, the absorption spectrum of the storage medium needs to be measured and a new wavelength 2 should be selected to avoid the high absorption spectrum region of the storage medium, resulting in a large investment in lasers

[0006] These problems of the dual-wavelength scheme are not suitable for the sensitivity test of the volume holographic storage medium in the research and development process, because the volume holographic storage medium in the research and development process often has high shrinkage, poor production consistency, and changes in absorption spectrum caused by composition adjustment.

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