23 January 2002 First observation of ultraslow group velocity of light in a solid
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We report ultraslow group velocities of light in a solid. Light speeds as slow as 45 m/s were observed, corresponding to a group delay of 66 microsecond(s) in a 3-mm thick, optically dense crystal of Pr doped Y2SiO5. Reduction of the group velocity is accomplished by using a sharp spectral feature in absorption and dispersion that is produced by resonance Raman excitation of a ground-state spin coherence. Potential applications of slow and stopped light for the highly efficient storage and recall of optical data are discussed.
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Alexey V. Turukhin, Alexey V. Turukhin, Venkatapura S. Sudarshanam, Venkatapura S. Sudarshanam, J. A. Musser, J. A. Musser, M. Selim Shahriar, M. Selim Shahriar, Philip L. Hemmer, Philip L. Hemmer, } "First observation of ultraslow group velocity of light in a solid", Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); doi: 10.1117/12.454041; https://doi.org/10.1117/12.454041

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