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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Photorefractive real-time phase-coded optical correlation storage using a crossed cylindrical-collimating lens

Zhongxiang Zhou¹, Dewei Gong, Qingxin Meng

¹Department of Physics, Harbin Institute of Technology, Harbin, China.

|March 27, 2007

Summary

Researchers developed phase-coded optical correlation storage in photorefractive crystals. This method enables fast, real-time retrieval of specific information from large data sets stored within the crystal.

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Area of Science:

Optics and Photonics
Materials Science
Information Storage

Background:

Optical correlation storage offers advantages for data retrieval.
Photorefractive crystals are promising media for holographic data storage.
Multiplexing techniques are crucial for increasing storage capacity.

Purpose of the Study:

To realize phase-coded optical correlation storage in photorefractive crystals.
To combine rotational phase-coded multiplexing with angular multiplexing.
To investigate the storage and retrieval capabilities of this combined approach.

Main Methods:

Utilized a crossed cylindrical-collimating lens system for phase-coded storage.
Employed Zn:Fe:LiNbO3 crystals doped with iron and zinc.
Implemented a combination of rotational phase-coded and angular multiplexing.

Main Results:

Successfully multiplexed and identified 36 holograms within the same crystal volume.
Demonstrated real-time and fast selection of correlated information.
Observed the performance characteristics of phase-coded multiplexing, including crosstalk and angular selectivity.

Conclusions:

Phase-coded optical correlation storage in photorefractive crystals is feasible.
Combining multiplexing techniques enhances storage density and retrieval efficiency.
The developed system offers a promising solution for high-capacity, fast-access optical data storage.