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Optics Letters

Time-domain holographic image storage

Xiao A. Shen, E. Chiang, Ravinder Kachru

Published Aug 15, 1994• 31 citations
Publisher

Abstract

We describe a practical approach to image storage in a coherent time-domain optical memory that can be readily implemented with existing technologies. In this approach, two-dimensional images are stored spectroholographically in narrow ( less, similar 1-MHz) frequency channels of a time-domain storage material by use of a low-power laser, with one image per channel. Advantages of this approach include fast single-frame recording time, variable playback speeds, and random frame access. Experimental results demonstrating the use of this approach for high-speed, long-term image storage in Eu(3+):Y(2)SiO(5) are presented.

DOI
10.1364/ol.19.001246

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Optics Letters•Nov 15, 1996•3 citations
We describe a practical approach to image storage in a coherent time-domain optical memory that can be readily implemented with existing technologies. In this approach, two-dimensional images are stored spectroholographically in narrow ( less, similar 1-MHz) frequency channels of a time-domain storage material by use of a low-power laser, with one image per channel. Advantages of this approach include fast single-frame recording time, variable playback speeds, and random frame access. Experimental results demonstrating the use of this approach for high-speed, long-term image storage in Eu(3+):Y(2)SiO(5) are presented.
We describe a practical approach to 2D image storage in a coherent time-domain optical memory, which can be readily implemented with existing technologies. In this approach, images are stored spectroholographically in narrow (< 1 MHz) frequency channels of a time-domain storage material, with one image per channel. Advantages of this approach include fast single-frame recording time, variable playback speeds, random frame access, and the ability to perform in-memory image processing. Experimental results demonstrating high- resolution, high-fidelity, single-channel image storage with the use of a low-power, single- frequency ring laser are presented.
The objective of this research was to quantitatively evaluate the concept of time-domain optical memory (TDOM) using the hole-burning mechanism. The TDOM concept offers both high speed and high memory density. The advantage of TDOM over traditional semiconductor memory is its inherent parallelism, which allows data to be stored and retrieved from the memory at much higher speed. The practical success of the proposed memory, therefore, depends critically on-among other issues-the storage, retrieval, and processing of images. In addition, new data storage techniques are needed to implement a practical memory. The last three years of this research program have focused on (1) development of new phase modulation techniques to enhance the storage, retrieval, and integrity of the stored information; (2) experimental studies of image storage and phase conjugate retrieval; (3) Image processing; and (4) practical holographic storage of images by using the hybrid time-frequency approach. Specifically, SRI demonstrated data encryption by phase modulating the read and write pulses. Image correlation and convolution was demonstrated and its implication for pattern recognition examined. Finally, this laboratory demonstrated high-fidelity random access and retrieval using holographic storage in Pr3+: YA103 with a single-frequency ring laser. These experiments have clearly demonstrated the practical viability ofmore » TDOM with existing technology. In the next stage of the research, the performance Issues such as bit-error-rates, signal-to-noise ratios, and laser stability need to be addressed. Stimulated photon echoes, Optical memory, Image processing, Pattern recognition, Phase conjugation.« less
One of the unique and perhaps the most attractive features of an optical memory is its ability to store and retrieve information in a bit-parallel format.1-3 Recently, we have proposed a new scheme for parallel data storage in TDOM.4,5 This scheme was proven to be practical and can be implemented with existing technologies. In a proof-of-principle experiment, four wavelength-multiplexed single-page volume spectral holograms, generated with black-and-white transparencies, were successfully stored in a single spatial location at a speed of approximately 23 μs/frame. The experimental results project system's input/output bandwidth to exceed 40 Gbps, two orders of magnitude faster than a semiconductor cache memory.
We are developing a high density, high speed optical memory, using rare-earth doped hole- burning materials. These materials are theoretically capable of achieving storage densities of 1000 Gigabits/cm3 at input/output (I/O) rates of several gigabits/sec. One remarkable attribute of this storage concept is that both the temporal and spatial information encoded on a laser beam can be stored. Because both the temporal and spatial information can be stored, digital data can be recorded serially as a data or packet stream as well as holographically using the page format. During the past year we have achieved a breakthrough in demonstrating random access holographic data storage at high frame rates. Five hundred holograms were stored and retrieved with very good fidelity at 30 Hz (video rate). Each holographic image with 512 multiplied by 488 pixels could be randomly accessed during the storage and retrieval process. This frame rate is the highest demonstrated frame rate for any optical technique. This breakthrough was achieved through the invention of a memory architecture that allows multiple holographic frames to be stored without any mechanical beam scanning. In this new architecture multiplexing of 500 holograms was achieved by stepping the laser frequency over a range covered by high speed acousto-optic modulators (AOM).
We propose and demonstrate a novel type of frequency-selective optical memory that writes and reads the data in both the time domain and the frequency domain. Temporal 16-bit data were stored by accumulated-photon-echo bit-by-bit storage at 103 frequency addresses within the inhomogeneous line of the (7)F(0)-(5)D(0) transition of Eu(3+):Y(2)SiO(5), which yields a total memory capacity of 1.6 kbits in a single spot of 240-microm diameter. The keys to the success of this experiment are this material's long dephasing time and lack of spectral diffusion.
Spectral holography provides for the storage of data-encoded, time-domain optical signals in frequency-selective recording materials. This capability may form the basis for entirely new classes of ultrahigh-speed and -density optical storage devices. We demonstrate the implementation of swept-carrier spectral-holographic data storage in a single-sideband mode. Temporal-waveform information originally encoded in doublesideband format is re-created but stripped of one of its sidebands. The process described can be used to achieve higher spectral storage densities or as an optical single-sideband conversion device.