Superluminal ring laser for hypersensitive sensing

H. N. Yum, M. Salit, J. Yablon, K. Salit, Y. Wang, M. S. Shahriar

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


The group velocity of light becomes superluminal in a medium with a tuned negative dispersion, using two gain peaks, for example. Inside a laser, however, the gain is constant, equaling the loss. We show here that the effective dispersion experienced by the lasing frequency is still sensitive to the spectral profile of the unsaturated gain. In particular, a dip in the gain profile leads to a superluminal group velocity for the lasing mode. The displacement sensitivity of the lasing frequency is enhanced by nearly five orders of magnitude, leading to a versatile sensor of hyper sensitivity.

Original languageEnglish (US)
Pages (from-to)17658-17665
Number of pages8
JournalOptics Express
Issue number17
StatePublished - Aug 16 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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