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High Power Laser and Particle Beams

High sensitivity slow light interferometer

Yundong Zhang, Cai Yuan-Xue, yang chaobo, Boshi Dang, Wang Jinfang, Ping Yuan

Published Jul 12, 2010• 0 citations
OpenAlex

Abstract

A novel interferometer is designed based on the dispersive property of slow light media. The numerical simulation on its physical process proves that the spectral sensitivity of interferometer can be enhanced effectively using the slow light medium. And the sensitivity is proportional to the group refractive index of the slow light medium. A further investigation gives the general method of designing slow light interferometers taking into account the dispersive property of GaAs. It is theoretically demonstrated that the spectral sensitivity of an interferometer can be greatly enhanced by dispersive property of semiconductor GaAs in nearinfrared region.

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A novel interferometer is designed based on the dispersive property of slow light media. The numerical simulation on its physical process proves that the spectral sensitivity of interferometer can be enhanced effectively using the slow light medium. And the sensitivity is proportional to the group refractive index of the slow light medium. A further investigation gives the general method of designing slow light interferometers taking into account the dispersive property of GaAs. It is theoretically demonstrated that the spectral sensitivity of an interferometer can be greatly enhanced by dispersive property of semiconductor GaAs in nearinfrared region.
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We investigate how the use of slow-light methods can enhance the performance of various types of spectroscopic interferometers under practical conditions. We show that, while in ideal cases the enhancement of the spectral resolution is equal to the magnitude of the group index of the slow-light medium, the ratio between the associated gain or loss and the group index of the slow-light medium actually determines the spectral resolution under more-general conditions. Moreover, the dispersion of this ratio leads to frequency-dependent spectral resolution, which limits the useful working bandwidth of the interferometer. We also evaluate the performance of interferometers using three specific slow-light processes in terms of the achievable spectral resolution and the effective working finesse. We show that the spectral resolution is typically limited by the characteristic linewidth of each slow-light process and that there is no fundamental upper limit for the effective working finesse.