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

Conference on Lasers and Electro-Optics

Optical data storage by electromagnetically induced transparency and nondegenerate four-wave mixing in a spectral hole-burning solid

Byoung Seung HAM, M. S. Shahriar, M.K. Kim, Philip Hemmer

Published Jan 1, 1998• 2 citations
Publisher

Abstract

Summary form only given. We demonstrated two bits of optical data storage by a novel technique of electromagnetically induced transparency (EIT)-excited spin echoes. This experiment demonstrates the potential of high-density and fast optical data memory at high temperature. We show its first application to optical data storage using spin photon echo excited by two-photon resonance.

DOI
10.1109/cleo.1998.675842

Related papers

Efficient generation of Raman echo and time-domain optical data storage by electromagnetically induced transparency

Myung K. Kim, Philip Hemmer, Byoung Seung HAM +1 more

We have observed excitation of spin echoes and spin free induction decay (FID) by electromagnetically induced transparency (EIT) in an optically dense solid sample. The experiments are done in a double-lambda system of 605.7 nm 3H4 - 1D2 transition of Pr3+:Y2SiO5, where the 10.2 MHz ground state spin coherence is excited by low-power resonant Raman pulses. It has been shown that the spin coherence, including spin echo, is equivalent to the transparent state of EIT, and therefore a high efficiency is expected for such resonant Raman-excited spin echo. The observed efficiency of spin echo is as high as 75% of the FID signal at 5K. A background-free detection scheme is used based on EIT and enhanced nondegenerate four-wave mixing. The technique is applied in the frequency-selective time-domain optical data storage, that utilizes the spin as well as the optical inhomogeneous spectral widths. The data storage scheme is analogous to the stimulated spin echo with resonant Raman excitation of the spin coherence. We verify that the write window is determined by the spin T2 which is much longer than the optical T2, especially at higher temperature. We find that the spin dephasing time T2 is almost constant at approximately 500 microseconds in the range of 2 to approximately 6 K, whereas the optical T2 decreases rapidly, by a factor of approximately 50, above 4 K. These results will be useful in the development of high capacity time-domain optical data storage operating at higher temperature.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 5, 1998•1 citation

Enhanced nondegenerate four-wave mixing owing to electromagnetically induced transparency in a spectral hole-burning crystal

Byoung Seung HAM, M. S. Shahriar, Philip Hemmer

We have demonstrated electromagnetically induced transparency (EIT) in an inhomogeneously broadened spectral hole-burning system of Pr(3+)-doped Y(2)SiO(5) at 6 K. We have also shown enhancement of four-wave mixing under conditions of reduced absorption. This demonstration opens the possibilities of pursuing EIT applications such as high-resolution optical image processing and optical data storage in solids.

Optics Letters•Aug 1, 1997•173 citations

Electromagnetically induced transparency over spectral hole-burning temperature in an inhomogeneously broadened solid

Byoung Seung HAM, Philip Hemmer, M. S. Shahriar

Summary form only given. When a resonant Raman laser field interacts with a three-level energy system, the system can undergo changes of linear and nonlinear optical properties. Especially in an optically thick medium, a strong resonant electromagnetic field can dress the energy states so that another resonant probe field may not be absorbed. This is due to destructive quantum interference between two absorption paths from the ground state to the dressed states. This phenomenon is called electromagnetically induced transparency. Our recently demonstrated Raman excited spin echo technique uses optically induced spin coherence. In general, the spin coherence decay time is much longer and more temperature insensitive than the optical coherence, so that the temperature limitation of the photon echoes can be overcome. The spin echoes are read by another optical field via enhanced four-wave mixing. Here, the nonlinearity in the optical transition is enhanced by EIT. In this paper we report the EIT observation at temperatures higher than that needed for the (optical) spectral hole-burning.

Quantum Electronics and Laser Science Conference•Jan 20, 2003•2 citations

Frequency-selective time-domain optical data storage by electromagnetically induced transparency in a rare-earth-doped solid

Byoung Seung HAM, M. S. Shahriar, M. K. Kim +1 more

We report the experimental observation of optical data storage by frequency-selective stimulated spin echoes based on electromagnetically induced transparency in an inhomogeneously broadened rare-earth-doped solid. We find that the spin dephasing time T(2) is almost constant in the range 2-6 K, whereas the optical T(2) shortens rapidly above 4 K. This experiment demonstrates the potential of spin echoes excited by electromagnetically induced transparency for higher-capacity optical data storage at higher temperature.

Optics Letters•Dec 15, 1997•139 citations

Optical Memory Using Resonant Raman Pulse Excited Spin Echoes

Byoung Seung HAM, M. S. Shahriar, M. K. Kim +1 more

Optical data storage has been interested in several decades because of the potential of fast access time and high-density storage. Recently volume holographic data storage technique has drawn much interest as new materials and improved techniques have developed.1 However, the large of hologram storage is restricted by low diffraction efficiency and mainly focused to read only memory because of the material's characteristic difficult to rewrite in short time interval. Another optical memory technique (photon echo optical memory)2 based on time-domain has developed since 1980's and made big progress for the area of real time image processing and dynamic random access memory. In this technique, data pulses interfere with timely separated write pulse (reference), and their interference pattern is written as population gratings. A read pulse (reference) retrieves each data pulse information as a four-wave mixing process. The write and read pulse separations are restricted by phase and population decay times of the material, respectively, and storage density is determined by the ratio of inhomogeneous to homogeneous linewidths. Even though photon echo technique has advantages of fast access time (≥ ns) and high-density (≥ Mbits/laser spot), its operating temperature is kept extremely low around liquid helium temperature. This is because that homogeneous decay time rapidly shortens as temperature increases due to phonon interactions, i.e., the ratio of inhomogeneous to homogeneous decay rates is ~ 1 at liquid nitrogen temperature (77 K) in a rare-earth doped solid, so that restricts its applications.

Optical Data Storage•Jan 1, 1998•0 citations

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

Philip Hemmer, M. S. Shahriar, Alexey V. Turukhin

Summary form only given.Optical spectral hole-burning has demonstrated the ability to achieve high-capacity, high-speed data storage. Unfortunately, widespread application of this technique has been limited by the requirement for low temperature operation. To circumvent this problem, we have been investigating the possibility of using Raman-excited spin coherences to store and recall optical data. The motivation is that optical Raman excitation allows storage densities and response times characteristic of optical hole-burning memories, but because it is based on long-lived spin coherences, it can maintain these characteristics at much higher operating temperatures. For the initial experiments we chose to use N-V color centers in diamond as the Raman hole-burning material because it is comparatively well studied.

Conference on Lasers and Electro-Optics•Jan 1, 2000•0 citations
Summary form only given. We demonstrated two bits of optical data storage by a novel technique of electromagnetically induced transparency (EIT)-excited spin echoes. This experiment demonstrates the potential of high-density and fast optical data memory at high temperature. We show its first application to optical data storage using spin photon echo excited by two-photon resonance.
We have observed excitation of spin echoes and spin free induction decay (FID) by electromagnetically induced transparency (EIT) in an optically dense solid sample. The experiments are done in a double-lambda system of 605.7 nm 3H4 - 1D2 transition of Pr3+:Y2SiO5, where the 10.2 MHz ground state spin coherence is excited by low-power resonant Raman pulses. It has been shown that the spin coherence, including spin echo, is equivalent to the transparent state of EIT, and therefore a high efficiency is expected for such resonant Raman-excited spin echo. The observed efficiency of spin echo is as high as 75% of the FID signal at 5K. A background-free detection scheme is used based on EIT and enhanced nondegenerate four-wave mixing. The technique is applied in the frequency-selective time-domain optical data storage, that utilizes the spin as well as the optical inhomogeneous spectral widths. The data storage scheme is analogous to the stimulated spin echo with resonant Raman excitation of the spin coherence. We verify that the write window is determined by the spin T2 which is much longer than the optical T2, especially at higher temperature. We find that the spin dephasing time T2 is almost constant at approximately 500 microseconds in the range of 2 to approximately 6 K, whereas the optical T2 decreases rapidly, by a factor of approximately 50, above 4 K. These results will be useful in the development of high capacity time-domain optical data storage operating at higher temperature.
Summary form only given. When a resonant Raman laser field interacts with a three-level energy system, the system can undergo changes of linear and nonlinear optical properties. Especially in an optically thick medium, a strong resonant electromagnetic field can dress the energy states so that another resonant probe field may not be absorbed. This is due to destructive quantum interference between two absorption paths from the ground state to the dressed states. This phenomenon is called electromagnetically induced transparency. Our recently demonstrated Raman excited spin echo technique uses optically induced spin coherence. In general, the spin coherence decay time is much longer and more temperature insensitive than the optical coherence, so that the temperature limitation of the photon echoes can be overcome. The spin echoes are read by another optical field via enhanced four-wave mixing. Here, the nonlinearity in the optical transition is enhanced by EIT. In this paper we report the EIT observation at temperatures higher than that needed for the (optical) spectral hole-burning.
We report the experimental observation of optical data storage by frequency-selective stimulated spin echoes based on electromagnetically induced transparency in an inhomogeneously broadened rare-earth-doped solid. We find that the spin dephasing time T(2) is almost constant in the range 2-6 K, whereas the optical T(2) shortens rapidly above 4 K. This experiment demonstrates the potential of spin echoes excited by electromagnetically induced transparency for higher-capacity optical data storage at higher temperature.
Optical data storage has been interested in several decades because of the potential of fast access time and high-density storage. Recently volume holographic data storage technique has drawn much interest as new materials and improved techniques have developed.1 However, the large of hologram storage is restricted by low diffraction efficiency and mainly focused to read only memory because of the material's characteristic difficult to rewrite in short time interval. Another optical memory technique (photon echo optical memory)2 based on time-domain has developed since 1980's and made big progress for the area of real time image processing and dynamic random access memory. In this technique, data pulses interfere with timely separated write pulse (reference), and their interference pattern is written as population gratings. A read pulse (reference) retrieves each data pulse information as a four-wave mixing process. The write and read pulse separations are restricted by phase and population decay times of the material, respectively, and storage density is determined by the ratio of inhomogeneous to homogeneous linewidths. Even though photon echo technique has advantages of fast access time (≥ ns) and high-density (≥ Mbits/laser spot), its operating temperature is kept extremely low around liquid helium temperature. This is because that homogeneous decay time rapidly shortens as temperature increases due to phonon interactions, i.e., the ratio of inhomogeneous to homogeneous decay rates is ~ 1 at liquid nitrogen temperature (77 K) in a rare-earth doped solid, so that restricts its applications.
Summary form only given.Optical spectral hole-burning has demonstrated the ability to achieve high-capacity, high-speed data storage. Unfortunately, widespread application of this technique has been limited by the requirement for low temperature operation. To circumvent this problem, we have been investigating the possibility of using Raman-excited spin coherences to store and recall optical data. The motivation is that optical Raman excitation allows storage densities and response times characteristic of optical hole-burning memories, but because it is based on long-lived spin coherences, it can maintain these characteristics at much higher operating temperatures. For the initial experiments we chose to use N-V color centers in diamond as the Raman hole-burning material because it is comparatively well studied.