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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Miniaturized design of the optical head used for three-dimensional photon storage

Guoping Zhang

Published Nov 21, 2001• 0 citations
Publisher

Abstract

The two-photon storage technology is discussed for the ultra-high-density three-dimensional optical data storage in this paper. We present the miniatured design of the optical head for the two-photon storage. Binary optical technology is used to obtain the desired reading and writing beams in an integrated optical head. Arrayed optical head system is designed to increase the data transmission speed. This design can reduce the weight and simplify the structure of the optical head system, and is helpful to make the two- photon storage technology commercialized.

DOI
10.1117/12.449165

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The two-photon storage technology is discussed for the ultra-high-density three-dimensional optical data storage in this paper. We present the miniatured design of the optical head for the two-photon storage. Binary optical technology is used to obtain the desired reading and writing beams in an integrated optical head. Arrayed optical head system is designed to increase the data transmission speed. This design can reduce the weight and simplify the structure of the optical head system, and is helpful to make the two- photon storage technology commercialized.
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Fiber-optic head is developed and fabricated for information reading out from and writing-down to hard carriers. Fiber- optic scanner using this head is realized on the basis of existing computer printers and plotters and its characteristics are investigated. Fiber-optic technique is used for excitation of photon echo. Photon echo was observed with multimode fiber when it was coupled with initial pulsed laser radiation in quasi-singlemode regime. Predictions are made for the possibility of creation photon-echo fiber-based echo-processors and their possible schemes are proposed.
Optical data storage has been interested in several decades because of the potential of fast access time and high-density storage. Recently volume holographic data storage technique has drawn much interest as new materials and improved techniques have developed.1 However, the large of hologram storage is restricted by low diffraction efficiency and mainly focused to read only memory because of the material's characteristic difficult to rewrite in short time interval. Another optical memory technique (photon echo optical memory)2 based on time-domain has developed since 1980's and made big progress for the area of real time image processing and dynamic random access memory. In this technique, data pulses interfere with timely separated write pulse (reference), and their interference pattern is written as population gratings. A read pulse (reference) retrieves each data pulse information as a four-wave mixing process. The write and read pulse separations are restricted by phase and population decay times of the material, respectively, and storage density is determined by the ratio of inhomogeneous to homogeneous linewidths. Even though photon echo technique has advantages of fast access time (≥ ns) and high-density (≥ Mbits/laser spot), its operating temperature is kept extremely low around liquid helium temperature. This is because that homogeneous decay time rapidly shortens as temperature increases due to phonon interactions, i.e., the ratio of inhomogeneous to homogeneous decay rates is ~ 1 at liquid nitrogen temperature (77 K) in a rare-earth doped solid, so that restricts its applications.