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Observation of Raman Resonance of a Probe in a Rb Cell Added to an Ethane-Rb Laser for Realizing a Superluminal Laser

Joshua Yablon, Shih Tseng, Zifan Zhou, M. S. Shahriar

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We report sub-natural linewidth Raman resonance for a probe applied to an auxiliary Rb cell added to an Ethane-Rb laser as a key step towards realizing a superluminal ring laser for ultrasensitive gyroscopy and accelerometry.
DOI
10.1364/cleo_at.2013.jw2a.86

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We show that group velocity of light far exceeding the vacuum speed can be realized when a medium that produces a narrow band dip in the gain profile is placed inside a ring laser. The dip leads to an effective negative dispersion, which can be tuned to produce a very small group index. The rotational sensitivity of the ring laser is enhanced by a factor equaling the inverse of the group index. For a realistic system, the enhancement factor can be as high as 1.8*105. In order to realize such a device, the background gain can be produced by using, for example, an optically pumped Ti:Sapphire crystal, a semiconductor optical amplifier, or a diode pumped alkali laser. The narrow dip can be produced, for example, by a Rb cell configured for Raman depletion. Here, we present the theoretical model behind such a superluminal laser, and describe a preliminary experiment for realizing such a device.