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Annual Meeting Optical Society of America

Long-term storage and phase conjugation of time-resolved multiple images

M. K. Kim, Ravinder Kachru

Published Jan 1, 1987• 0 citations
Publisher

Abstract

We have observed long-term storage and phase conjugation of multiple images using a backward stimulated echo scheme in the 3H4—3P0 transition of Pr3+:LaF3 crystal. The input spatial images are separated by 20-ns time intervals. The temporal order of the multiple-echo images is the reverse of the input images. Each echo image is a phase-conjugate replica of the corresponding input image. The storage lasts up to 15 s. This constitutes, in principle, the first demonstration of an ultrafast holographic movie using stimulated photon echo.

DOI
10.1364/oam.1987.mf2

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The backward stimulated echo has been considered as a novel high-speed high-density optical data storage method. But its potential application has been confined to transient dynamic memory because of relatively short lifetime of optical coherence inside low-temperature solids. Here we report the longest observed storage time of at least six hours in the 581.8 nm7F0-5D0 transition of eu 3+ -doped YAlO3 crystal at 2°K. The experiments are performed using YAG-pumped pulsed dye lasers, beamsplitters and optical delay lines to produce five DATA pulses, at 20 nsec intervals, and WRITE and READ pulses. The measured echo intensity as a function of storage time has exponential decay time of 3.8 hours. This very long storage time is due to the very small effective nuclear magnetic moments of Eu3+ ions, and is consistent with the long lifetime of spectral hole in this system. We also observed that the signal fidelity is not noticeably affected by the number of DATA pulses and the long storage time.

Annual Meeting Optical Society of America•Jan 1, 1988•0 citations
We have observed long-term storage and phase conjugation of multiple images using a backward stimulated echo scheme in the 3H4—3P0 transition of Pr3+:LaF3 crystal. The input spatial images are separated by 20-ns time intervals. The temporal order of the multiple-echo images is the reverse of the input images. Each echo image is a phase-conjugate replica of the corresponding input image. The storage lasts up to 15 s. This constitutes, in principle, the first demonstration of an ultrafast holographic movie using stimulated photon echo.
We have observed spatial-image storage and phase conjugation, using a backward-stimulated echo in a solid sample. The image storage and the delayed phase conjugation were observed to last for at least 15 sec, which is 3 × 105 times longer than the radiative lifetime of the excited state. The backward-stimulated echo produced on the 3H4–3P0 transition of Pr3+:LaF3 is found to be a phase-conjugated spatial reproduction of the first excitation pulse. The image storage time depends strongly on the sample temperature.
The phase conjugation property of backward-stimulated photon echo (BSE) has numerous potential applications in optical data storage and processing. We demonstrate mixed binary multiplication of spatially encoded bit patterns, by taking advantage of the fact that the geometry of BSE is analogous to that of conventional holography or four-wave mixing of nonlinear optics, where an object (data) and a reference (write) beams interfere to create a grating inside the medium, and another reference (read) beam is diffracted from that grating. When all three input beams contain structures, the output pattern is the convolution and correlation of the input patterns, which, with certain arrangements and interpretation, can be used for multiplication of binary numbers. The experiments were done by using a 477.8 nm transition of praseodymium ion-doped in single-crystal lanthanum trifluoride.
The backward stimulated echo has been considered as a novel high-speed high-density optical data storage method. But its potential application has been confined to transient dynamic memory because of relatively short lifetime of optical coherence inside low-temperature solids. Here we report the longest observed storage time of at least six hours in the 581.8 nm7F0-5D0 transition of eu 3+ -doped YAlO3 crystal at 2°K. The experiments are performed using YAG-pumped pulsed dye lasers, beamsplitters and optical delay lines to produce five DATA pulses, at 20 nsec intervals, and WRITE and READ pulses. The measured echo intensity as a function of storage time has exponential decay time of 3.8 hours. This very long storage time is due to the very small effective nuclear magnetic moments of Eu3+ ions, and is consistent with the long lifetime of spectral hole in this system. We also observed that the signal fidelity is not noticeably affected by the number of DATA pulses and the long storage time.