Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Studies of Optical Spectral Holeburning Using Raman Coherent Population Trapping

Shaoul Ezekiel, M. S. Shahriar

Published Jul 31, 1999• 0 citations
OpenAlex

Abstract

Under this grant, we have studied Raman coherent population trapping in a solid, with applications to five dimensional optical data storage. In particular, we have studied Raman spectral holeburning in Pr:YSO, which has properties suitable for optical data storage. During this period, we have made significant advances in our pursuit towards storage of optical information in this medium. In addition, we have stored and retrieved optical images in two amorphous hosts: polystyrene doped with the dye chlorin-e6, and polymethylmethalacrylate doped with the dye phenanthraquinone The work has resulted in eleven journal publications and 10 conference presentations. The basic results are summarized below.

Related papers

Optical Spectral Holeburning with Raman Coherent Population Trapping

Philip Hemmer, M. S. Shahriar, Byoung Seung HAM +2 more

Optical spectral holeburning is examined for the case when two-frequency Raman resonant laser excitation is used in place of conventional single frequency excitation. It is found that Raman coherent population trapping can be used to increase storage capacity beyond the limit given by the ratio of optical inhomogeneous to homogeneous linewidths. This is possible because Raman population trapping provides an additional storage dimension. Theoretical analysis and practical issues are presented.

Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals•Dec 1, 1996•4 citations

Time-domain optical data storage by use of Raman coherent population trapping

Philip Hemmer, M. S. Shahriar, M. K. Kim +2 more

We experimentally demonstrate time-domain storage and retrieval of amplitude- and phase-encoded optical data, using Raman coherent population trapping, despite the loss of information about absolute optical phases that occurs as a result of the dissipative nature of the process. In this Raman optical storage process homogeneous decay of the optical coherence does not prevent interference between time-separated fields, thus relaxing the requirement for long-lived optical coherences.

Optics Letters•Feb 15, 1994•35 citations

Raman-excited spin coherences for high-temperature spectral hole burning memories

Philip Hemmer, M. S. Shahriar, Byoung Seung HAM +1 more

The possibility of using Raman excited spin coherences to increase the operating temperature of spectral hole burning memories and processors is being explored experimentally. The approach is to store and/or process data using spin coherences excited by optical Raman transitions. This is motivated by the fact that spin coherence lifetimes are much less sensitive to temperature than optical coherence lifetimes. However, direct microwave excitation of spin coherences does not give a high storage density because of the large microwave wavelength. By using optical Raman fields to excite the spin coherences, full optical spatial resolution can be achieved. Initial experiments in Pr doped YSO demonstrated potential for higher temperature operation. Current experiments are concentrating on further increasing the operating temperature using this and other materials.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 22, 1999•0 citations

Material challenges for spectral hole-burning memories

Zameer U. Hasan

It was envisaged that spectral holeburning based optical memory will provide orders of magnitude improvement in storage densities. The progress has basically been hampered by the lack of materials with proper performance characteristics. In the past two decades, novel atomic scale processes involved in holeburning have been investigated in detail in order to improve the performance of existing materials and to engineer new ones. On the other hand, significant advances have been made in optical storage techniques to use the materials available. And now, new materials that can approach the specifications of a memory device using different techniques for the storage are either available or are just over the horizon. This paper reviews the status of different classes of spectral holeburning materials suitable for memory devices.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 5, 1998•2 citations

Efficient and long-lived Zeeman-sublevel atomic population storage in an erbium-doped glass fiber

Erhan Sağlamyürek, Thomas Lutz, Lucile Veissier +4 more

Long-lived population storage in optically pumped levels of rare-earth ions doped into solids, referred to as persistent spectral hole burning, is of significant fundamental and technological interest. However, the demonstration of deep and persistent holes in rare-earth ion doped amorphous hosts, e.g., glasses, has remained an open challenge for many decades---a fact that motivates our work towards a better understanding of the interaction between impurities and vibrational modes in glasses. Here we report the observation and detailed characterization of such holes in an erbium-doped silica glass fiber cooled to below 1 K. We demonstrate population storage in electronic Zeeman sublevels of the erbium ground state with lifetimes up to 30 seconds and 80% spin polarization. In addition to its fundamental aspect, our investigation reveals a potential technological application of rare-earth ion doped amorphous materials, including at telecommunication wavelength.

arXiv:1507.03012•Physical Review B•Dec 14, 2015•32 citations

Holographic optical data storage of 2000 images by photochemical hole burning

Bern Kohler, Stefan Bernet, Alois Renn +1 more

In addition to its importance for the optical spectroscopy of solids, photochemical spectral hole burning (PSHB) has attracted great interest due to its potential use in high density optical data storage [1]. By encoding information as a function of frequency an enormous increase in storage is possible compared to conventional optical storage materials. The most optimistic estimates predict an increase given by the ratio of the inhomogeneous linewidth to the homogeneous linewidth of the optical transition responsible for hole burning. Until now, however, there have been relatively few investigations of the practical limitations to storing a large number of spectral holes [2,3]. We describe here a recent experiment in which 2000 grayscale images were successfully recorded as holograms in the PSHB material chlorin in polyvinylbutyral. In holographic spectral hole burning the relative phase of the interfering light waves used to prepare the hologram has a strong influence on diffraction properties and, hence, on crosstalk between adjacent holograms [4]. By controlling the phase and frequency during burning in a novel manner, we have minimized crosstalk between the stored images.

Spectral Hole-Burning and Related Spectroscopies: Science and Applications•Jan 1, 1991•2 citations
Under this grant, we have studied Raman coherent population trapping in a solid, with applications to five dimensional optical data storage. In particular, we have studied Raman spectral holeburning in Pr:YSO, which has properties suitable for optical data storage. During this period, we have made significant advances in our pursuit towards storage of optical information in this medium. In addition, we have stored and retrieved optical images in two amorphous hosts: polystyrene doped with the dye chlorin-e6, and polymethylmethalacrylate doped with the dye phenanthraquinone The work has resulted in eleven journal publications and 10 conference presentations. The basic results are summarized below.
The possibility of using Raman excited spin coherences to increase the operating temperature of spectral hole burning memories and processors is being explored experimentally. The approach is to store and/or process data using spin coherences excited by optical Raman transitions. This is motivated by the fact that spin coherence lifetimes are much less sensitive to temperature than optical coherence lifetimes. However, direct microwave excitation of spin coherences does not give a high storage density because of the large microwave wavelength. By using optical Raman fields to excite the spin coherences, full optical spatial resolution can be achieved. Initial experiments in Pr doped YSO demonstrated potential for higher temperature operation. Current experiments are concentrating on further increasing the operating temperature using this and other materials.
It was envisaged that spectral holeburning based optical memory will provide orders of magnitude improvement in storage densities. The progress has basically been hampered by the lack of materials with proper performance characteristics. In the past two decades, novel atomic scale processes involved in holeburning have been investigated in detail in order to improve the performance of existing materials and to engineer new ones. On the other hand, significant advances have been made in optical storage techniques to use the materials available. And now, new materials that can approach the specifications of a memory device using different techniques for the storage are either available or are just over the horizon. This paper reviews the status of different classes of spectral holeburning materials suitable for memory devices.
Long-lived population storage in optically pumped levels of rare-earth ions doped into solids, referred to as persistent spectral hole burning, is of significant fundamental and technological interest. However, the demonstration of deep and persistent holes in rare-earth ion doped amorphous hosts, e.g., glasses, has remained an open challenge for many decades---a fact that motivates our work towards a better understanding of the interaction between impurities and vibrational modes in glasses. Here we report the observation and detailed characterization of such holes in an erbium-doped silica glass fiber cooled to below 1 K. We demonstrate population storage in electronic Zeeman sublevels of the erbium ground state with lifetimes up to 30 seconds and 80% spin polarization. In addition to its fundamental aspect, our investigation reveals a potential technological application of rare-earth ion doped amorphous materials, including at telecommunication wavelength.
In addition to its importance for the optical spectroscopy of solids, photochemical spectral hole burning (PSHB) has attracted great interest due to its potential use in high density optical data storage [1]. By encoding information as a function of frequency an enormous increase in storage is possible compared to conventional optical storage materials. The most optimistic estimates predict an increase given by the ratio of the inhomogeneous linewidth to the homogeneous linewidth of the optical transition responsible for hole burning. Until now, however, there have been relatively few investigations of the practical limitations to storing a large number of spectral holes [2,3]. We describe here a recent experiment in which 2000 grayscale images were successfully recorded as holograms in the PSHB material chlorin in polyvinylbutyral. In holographic spectral hole burning the relative phase of the interfering light waves used to prepare the hologram has a strong influence on diffraction properties and, hence, on crosstalk between adjacent holograms [4]. By controlling the phase and frequency during burning in a novel manner, we have minimized crosstalk between the stored images.