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Applied Optics

Direct pattern recognition of a motion picture by hole-burning holography of Eu^3+:Y_2SiO_5

Hiroko Sasaki, Koichi Karaki

Published Mar 10, 1997• 5 citations
Publisher

Abstract

We propose and demonstrate a novel technique for direct pattern recognition of motion pictures based on frequency- and spatial-domain holography using a cryogenic Eu(3+):Y(2)SiO(5) crystal. The fast hole-burning speed of the crystal allows a moving image to be continuously recorded in it by a frequency-scanned laser. Using Fourier transform holography permitted direct pattern recognition of a 25-s movie stored in the crystal to be realized. The correlation spot continuously followed the moving object with the same time resolution (10 ms) as the reproduced movie.

DOI
10.1364/ao.36.001742

Related papers

Holographic motion picture by Eu^3+:Y_2SiO_5

Masaharu Mitsunaga, Hiroko Sasaki, Koichi Karaki +1 more

Real-time recording of a moving object was made with persistent spectral hole burning of a cryogenic Eu(3+):Y(2)SiO(5) crystal. In a basic holographic configuration the ultrastable laser frequency was continuously scanned within the (7)F(0)-(5)D(0) absorption line (typically 200 MHz in 20 s) while the object was in motion, thus permitting the storage and reconstruction of the moving image. The success of this motion picture is attributable to (1) the kilohertz-wide hole width, (2) the quasi-persistent hole lifetime, and (3) the high hole-burning quantum efficiency of this material.

Optics Letters•May 15, 1994•34 citations

Holographic motion pictures by hole burning

Koichi Karaki, Hiroko Sasaki, Masaharu Mitsunaga

A real-time read/write motion picture has been demonstrated by hole-burning holography using cryogenic Eu3+:Y2SiO5 crystal. In a holographic configuration, the laser frequency was continuously scanned within the 7F0-5D0 absorption line while the object was in motion. Since this movie does not have any picture frames, it is temporary continuous. This feature might realize high-speed and high-time- resolution motion recording.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jul 27, 1995•1 citation

Holographic motion picture obtained by using Eu 3+ :Y 2 SiO 5

Hiroko Sasaki, Koichi Karaki, Masaharu Mitsunaga

Holographic image storage in an inhomogeneously boadened absorption line of a persistent spectral-hole-burning material has been studied extensively.1 The great wavelength-multiplexing capability of a hole-burning material permits the storage of 103 –106 images in the same spatial area of a medium. Therefore, hole-burning holography is expected to be an ultrahigh-density image-storage technique. More than 2000 images have been successfully stored in organic-dye-doped polymer samples.1

Conference on Lasers and Electro-Optics•May 21, 1995•0 citations

Holeburning Holography in Eu3+:Y2SiO5 crystal

Hiroko Sasaki, Koichi Karaki, Masaharu Mitsunaga +1 more

Holeburning holography is an ultrahigh density image storage technique. Since the memory capacity is governed by the ratio of the inhomogeneous-to-homogeneous linewidths, 103~106 images can be recorded in a single sample spot. An extensive study on holebuming holography has been carried out by Wild et.al for organic dye-doped polymer samples1-4. On the other hand, holeburning holography has not been carried out for crystal samples, because there are few crystals exhibiting persistent holes. We have performed holeburning holography to record images for Eu3+:Y2SiO5 crystal which has been known for exhibiting persistent holes. Moreover, Eu3+:Y2SiO5 has other unique features5,6 such as narrow holewidth and high holeburning quantum efficiency. By using this crystal, we have also succeeded in real-time recording of a moving object.

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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].

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Time-domain holographic image storage

Xiao A. Shen, E. Chiang, Ravinder Kachru

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.

Optics Letters•Aug 15, 1994•31 citations
We propose and demonstrate a novel technique for direct pattern recognition of motion pictures based on frequency- and spatial-domain holography using a cryogenic Eu(3+):Y(2)SiO(5) crystal. The fast hole-burning speed of the crystal allows a moving image to be continuously recorded in it by a frequency-scanned laser. Using Fourier transform holography permitted direct pattern recognition of a 25-s movie stored in the crystal to be realized. The correlation spot continuously followed the moving object with the same time resolution (10 ms) as the reproduced movie.
Real-time recording of a moving object was made with persistent spectral hole burning of a cryogenic Eu(3+):Y(2)SiO(5) crystal. In a basic holographic configuration the ultrastable laser frequency was continuously scanned within the (7)F(0)-(5)D(0) absorption line (typically 200 MHz in 20 s) while the object was in motion, thus permitting the storage and reconstruction of the moving image. The success of this motion picture is attributable to (1) the kilohertz-wide hole width, (2) the quasi-persistent hole lifetime, and (3) the high hole-burning quantum efficiency of this material.
Holeburning holography is an ultrahigh density image storage technique. Since the memory capacity is governed by the ratio of the inhomogeneous-to-homogeneous linewidths, 103~106 images can be recorded in a single sample spot. An extensive study on holebuming holography has been carried out by Wild et.al for organic dye-doped polymer samples1-4. On the other hand, holeburning holography has not been carried out for crystal samples, because there are few crystals exhibiting persistent holes. We have performed holeburning holography to record images for Eu3+:Y2SiO5 crystal which has been known for exhibiting persistent holes. Moreover, Eu3+:Y2SiO5 has other unique features5,6 such as narrow holewidth and high holeburning quantum efficiency. By using this crystal, we have also succeeded in real-time recording of a moving object.
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 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.