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Optical Memories and Processing in Time- and Frequency Domain

Luo, Baozhu LU (1998) In Lund Reports in Atomic Physics LRAP-233.
Abstract
Spectral hole burning and photon echoes are the techniques for frequency-selective optical memories, which have the potential to increase areal data storage density by a factor 10**7. They also have the capability to perform in-memory data processing. In this thesis, several materials and techniques for optical memories in the frequency- and time domain have been investigated.



In the frequency domain, ways to increase the storage density and the working temperature were studied using photon-gated spectral hole burning materials of the metal-tetrabenzoporphyrin derivatives. A selection rule for the electron acceptors in the donor-acceptor electron transfer systems was deduced. By doping the material with two different... (More)
Spectral hole burning and photon echoes are the techniques for frequency-selective optical memories, which have the potential to increase areal data storage density by a factor 10**7. They also have the capability to perform in-memory data processing. In this thesis, several materials and techniques for optical memories in the frequency- and time domain have been investigated.



In the frequency domain, ways to increase the storage density and the working temperature were studied using photon-gated spectral hole burning materials of the metal-tetrabenzoporphyrin derivatives. A selection rule for the electron acceptors in the donor-acceptor electron transfer systems was deduced. By doping the material with two different donors a maximum inhomogeneous line width of more than 30 THz was achieved. A polarization holographic technique was established for the formation and detection of spectral holes. Our results indicate that this technique can provide a better signal-to-noise ratio than that achieved by a conventional holographic technique, in particular for samples of poor optical quality.



In the time domain, magnetic field-induced and the intensity-induced dephasing processes were studied in Pr3+ doped in a YAlO3 crystal and a Y2SiO5 crystal, respectively. As a step along the route to make photon echo based optical processing possible, the amplification of photon echo signals by the use of a fiber amplifier (Pr3+-doped ZBLAN) was demonstrated. A gain of 45 was achieved. The erasure of stored data using photon echoes has also been investigated. A technique to diagnose the phase and frequency stability of a light source by the photon echo erasure process was proposed and illustrated. An approach to bit-selective data erasure, that is free from laser phase and frequency fluctuations, is also suggested. A concept for an arbitrary shape pulse generator based on photon echoes and hole-burning was experimentally and theoretically studied.



Finally, a comparison between the properties and capabilities of spectral hole burning and photon echoes was made. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Dr Kachru, Ravinder, SRI International, Menlo Park, California, USA
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Optical storage, photon echo, spectral hole burning, nonlinear optics, fiber amplifier, logical operation, phase retrieval, polarization holographic recording and retrieval, optical processing, Atomic and molecular physics, Atom- och molekylärfysik, Fysicumarkivet A:1998:Luo
in
Lund Reports in Atomic Physics
volume
LRAP-233
pages
175 pages
publisher
Department of Physics, Lund University
defense location
Lecture Hall A, Department of Physics, Sölvegatan 14, Lund, Sweden
defense date
1998-06-10 10:15:00
external identifiers
  • other:ISRN: LUTFD2/(TFAF-1036)1-105(1998)
ISSN
0281-2762
ISBN
91-628-3024-4
language
English
LU publication?
yes
id
f1e2c4d1-0f0a-4aee-9773-91262c03a06d (old id 38800)
date added to LUP
2016-04-04 11:38:10
date last changed
2025-04-04 14:26:01
@phdthesis{f1e2c4d1-0f0a-4aee-9773-91262c03a06d,
  abstract     = {{Spectral hole burning and photon echoes are the techniques for frequency-selective optical memories, which have the potential to increase areal data storage density by a factor 10**7. They also have the capability to perform in-memory data processing. In this thesis, several materials and techniques for optical memories in the frequency- and time domain have been investigated.<br/><br>
<br/><br>
In the frequency domain, ways to increase the storage density and the working temperature were studied using photon-gated spectral hole burning materials of the metal-tetrabenzoporphyrin derivatives. A selection rule for the electron acceptors in the donor-acceptor electron transfer systems was deduced. By doping the material with two different donors a maximum inhomogeneous line width of more than 30 THz was achieved. A polarization holographic technique was established for the formation and detection of spectral holes. Our results indicate that this technique can provide a better signal-to-noise ratio than that achieved by a conventional holographic technique, in particular for samples of poor optical quality.<br/><br>
<br/><br>
In the time domain, magnetic field-induced and the intensity-induced dephasing processes were studied in Pr3+ doped in a YAlO3 crystal and a Y2SiO5 crystal, respectively. As a step along the route to make photon echo based optical processing possible, the amplification of photon echo signals by the use of a fiber amplifier (Pr3+-doped ZBLAN) was demonstrated. A gain of 45 was achieved. The erasure of stored data using photon echoes has also been investigated. A technique to diagnose the phase and frequency stability of a light source by the photon echo erasure process was proposed and illustrated. An approach to bit-selective data erasure, that is free from laser phase and frequency fluctuations, is also suggested. A concept for an arbitrary shape pulse generator based on photon echoes and hole-burning was experimentally and theoretically studied.<br/><br>
<br/><br>
Finally, a comparison between the properties and capabilities of spectral hole burning and photon echoes was made.}},
  author       = {{Luo, Baozhu}},
  isbn         = {{91-628-3024-4}},
  issn         = {{0281-2762}},
  keywords     = {{Optical storage; photon echo; spectral hole burning; nonlinear optics; fiber amplifier; logical operation; phase retrieval; polarization holographic recording and retrieval; optical processing; Atomic and molecular physics; Atom- och molekylärfysik; Fysicumarkivet A:1998:Luo}},
  language     = {{eng}},
  publisher    = {{Department of Physics, Lund University}},
  school       = {{Lund University}},
  series       = {{Lund Reports in Atomic Physics}},
  title        = {{Optical Memories and Processing in Time- and Frequency Domain}},
  url          = {{https://lup.lub.lu.se/search/files/5819896/2299973.pdf}},
  volume       = {{LRAP-233}},
  year         = {{1998}},
}