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28 January 2005 Observation of ultraslow light propagation in a ruby crystal at room temperature
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We have observed slow light propagation with a group velocity as slow as 27.52±0.05m/s in a ruby crystal at room temperature. The Gaussian-like pulse signal, which was gained by modulating beam at 514.5nm, was injected into a ruby crystal. The spectral hole effect, attributed to high laser power density, leads to the induced refractive index steep rising. According as this rising, the group velocity of pulse propagation in the ruby becomes very slowly. The experiment result shows that the velocity of pulse propagation depends on the modulation frequency, laser power, the position of crystal and the profile of signal waveform. At the same condition the Gaussian-like pulse obtains much slower velocity than sinusoidal signal.
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Bao-Hua Fan, Yun-Dong Zhang, and Ping Yuan "Observation of ultraslow light propagation in a ruby crystal at room temperature", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005);

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