8 February 2007 Demonstration of interferometer sensitivity varying as the inverse of the group index
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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