Demonstration of Tunable Displacement-Measurement-Sensitivity using Variable Group Index in a Ring Resonator

Details Demonstration of Tunable Displacement-Measurement-Sensitivity using Variable Group Index in a Ring Resonator Demonstration of Tunable Displacement-Measurement-Sensitivity using Variable Group Index in a Ring Resonator

2006-10-04

arxiv.org/abs/quant-ph/0610023v4

Physics

Quantum Physics

14 Pages, 4 figures

Scientific paper

We show that an intra-cavity medium with normal dispersion reduces the sensitivity of the cavity resonance frequency to a change in its length by a factor inversely proportional to the group index. Since the group index in an atomic medium can be very large, this effect 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 enhanced sensitivity that can be realized for a negative dispersion corresponding to a group index close to a null value. This enhancement in turn can be employed to increase significantly the sensitivity of a ring laser gyroscope.

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