Frame frequency matching for high-speed reading in collinear holographic storage system

Jing Xu; Yongkun Lin; Linli Zhong; Yuping Yuping; Chen He; Dakui Lin; Xiao Lin; Kun Wang; Xiaodi Tan

doi:10.1117/12.3024816

1 February 2024 Frame frequency matching for high-speed reading in collinear holographic storage system

Jing Xu, Yongkun Lin, Linli Zhong, Yuping Yuping, Chen He, Dakui Lin, Xiao Lin, Kun Wang, Xiaodi Tan

Proceedings Volume 13067, International Workshop on Holography and Related Technologies (IWH2022 & 2023); 130670C (2024) https://doi.org/10.1117/12.3024816
Event: International Workshop on Holography and Related Technologies (IWH2022&2023), 2023, Fuzhou, China

Abstract

The frame frequency matching of the Digital Micro-mirror Device (DMD), the acousto-optic modulator (AOM) and high-speed camera can realize the holographic high-speed reading under the reference light changing scene, which greatly improves the data reading speed. In this work, the frame frequency matching to achieve high-speed reading is related to four factors: the resolution and exposure time of the high-speed camera, the duty ratio of AOM, and the phase difference between the signals sent by AOM and DMD. Through the research of the exposure time and resolution of high-speed cameras, the maximum synchronous frame rate of DMD and high-speed cameras can achieve 18KHZ. By synchronizing the frame frequency of both DMD and AOM trigger signals with the signal generator, controlling the duty ratio of AOM and the phase difference of the trigger signals sent to DMD and AOM can enable the high-speed camera to read the reproduction data page near the data recording point, avoiding the waste of storage space. The analysis of the experimental results shows that the camera can read clear information under the conditions of the incident optical power density is 32μw, the AOM duty ratio is larger than 10%, and the phase difference between AOM and DMD is 26°. The realization of DMD, high-speed camera and AOM frequency matching will effectively ensure the reading speed and decoding accuracy of holographic stored data

Citation Download Citation

Jing Xu, Yongkun Lin, Linli Zhong, Yuping Yuping, Chen He, Dakui Lin, Xiao Lin, Kun Wang, and Xiaodi Tan "Frame frequency matching for high-speed reading in collinear holographic storage system", Proc. SPIE 13067, International Workshop on Holography and Related Technologies (IWH2022 & 2023), 130670C (1 February 2024); https://doi.org/10.1117/12.3024816

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KEYWORDS

Bragg cells

High speed cameras

Digital micromirror devices

Holography

Cameras

Data storage

Holographic data storage systems

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