8 February 2007 Demonstration of interferometer sensitivity varying as the inverse of the group index
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Abstract
We have shown experimentally that dispersion due to an intra-cavity electromagnetically induced transparency or gain medium reduces the sensitivity of the cavity resonance frequency to a change in its length by a factor which is inversely proportional to the group index. Since the group index under atomic coherence can be made extremely large, the sensitivity of a long path length optical cavity can be reduced significantly. This can help in constructing highly frequency-stable cavities for various potential applications without taking additional measures for mechanical stability. The results also establish indirectly the opposite effect of increased sensitivity that can be realized for a negative dispersion corresponding to a group index close to a null value. These effects are discussed in the context of potential sensitivity enhancement of a rotation sensor.
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M. S. Shahriar, G. S. Pati, M. Messal, "Demonstration of interferometer sensitivity varying as the inverse of the group index", Proc. SPIE 6482, Advanced Optical and Quantum Memories and Computing IV, 64820L (8 February 2007); doi: 10.1117/12.716399; https://doi.org/10.1117/12.716399
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