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Conference on Lasers and Electro-Optics

Nondestructive readout and transient erasure of photon-gated hole-burning holograms

Alexander Rebane, D. Reiss

Published Jan 1, 1998• 0 citations
Publisher

Abstract

Summary form only given. We present results on organic hole-burning material that we apply for recording of image holograms with picosecond pulses. We show that such holographic images can be read out repeatedly and with high doses of illumination. Furthermore, it is possible to use an intense readout laser beam to saturate the absorption of the material at the resonance frequency where the hologram is recorded, without actually destroying the stored information.

DOI
10.1109/cleo.1998.676407

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Summary form only given. We present results on organic hole-burning material that we apply for recording of image holograms with picosecond pulses. We show that such holographic images can be read out repeatedly and with high doses of illumination. Furthermore, it is possible to use an intense readout laser beam to saturate the absorption of the material at the resonance frequency where the hologram is recorded, without actually destroying the stored information.
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Summary form only given.Frequency-selective materials, based on spectral hole-burning allow recording holograms and interferograms of spectrally broad-band, temporally incoherent light signals. An important task for information technology as well as spectroscopic applications is simultaneous recording of the temporal, spectral, and spatial characteristics of ultrashort optical signals. Single-shot recording with a spectral hole-burning material will allow us to measure individual time-varying optical amplitudes without involving any temporal or spatial averaging, thus maintaining complete information about an optical signal. We have performed experiments on recording and playback of time- and space-domain holograms using single femtosecond pulses. We have studied the dependence of the hologram recording and playback on both the energy and the number of the applied pulses as well as on photon gating mechanism by an additional laser pulse at a different frequency.
Persistent spectral hole burning [1] in conjunction with holography (PSHB) opens new prospects for high density optical information storage and processing. In the holographic approach, hole burning is carried out with two -crossed coherent laser beams which bleach out a narrow frequency domain hole in an inhomogeneously broadened absorption band recording, at the same time, a spatial holographic fringe pattern. During read out of the hologram diffraction from this spatial fringe pattern occurs, and a holographic image is reconstructed, reflecting the changes of the absorption coefficient and the refractive index introduced by the spectral hole [2].
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).
Time-and-space-domain holography [1,2] can be regarded as an extension of a conventional holographic process, where, in addition to the spatial image, the hologram plays back the time dependence of an event. The play-back of events is possible because we are using highly frequency-selective inhomogeneously broadened absorbers as recording material. This technique has a variety of potential applications in optical data storage and processing. In the present paper we consider the basic physical principle of time-and-space-domain storage in frequency-selective materials which exploit the effect of spectral hole burning [3]. In particular we will show that organic dye-doped spectral hole burning materials allow recording and playback of pi- co- and femtosecond time-scale events.