Ultrahigh enhancement in absolute and relative rotation sensing using fast and slow light

Abstract

We describe a resonator-based optical gyroscope whose sensitivity for measuring absolute rotation is enhanced via use of the anomalous dispersion characteristic of superluminal light propagation. The enhancement is given by the inverse of the group index, saturating to a bound determined by the group velocity dispersion. We also show how the offsetting effect of the concomitant broadening of the resonator linewidth may be circumvented by using an active cavity. For realistic conditions, the enhancement factor is as high as 10 6 . We also show how normal dispersion used for slow light can enhance relative rotation sensing in a specially designed Sagnac interferometer, with the enhancement given by the slowing factor.

Large Sagnac frequency splitting in a ring resonator operating at an exceptional point

“…Meanwhile, in conventional ring resonators without any periodic structures but with the same index and same radius, the magnitude of SFS is given by ω NS = (Re ω 0 /n 0 ) D [19,52]. The enhancement factor η defined by the ratio of ω EP to ω NS is…”

“…Thus far, many proposals for enhancing the sensitivity of SFS have been made [17,[19][20][21][22][23][24]. Most of them are based on enhancement using the effect of anomalous dispersion [19][20][21][22][23][24].…”

“…Most of them are based on enhancement using the effect of anomalous dispersion [19][20][21][22][23][24]. The SFS can be made larger by the effect of anomalous dispersion of superluminal light propagation in a resonator [19]. Although the enhancement using anomalous dispersion seems to be promising, it has been pointed out that strong dispersion systems are essentially accompanied by intense loss or significant linewidth broadening [25,26].…”

“…Most of them are based on enhancement using the effect of anomalous dispersion [19][20][21][22][23][24]. The SFS can be made larger by the effect of anomalous dispersion of superluminal light propagation in a resonator [19].…”

Suppression of coherent scattering by coherent population trapping on molecular vibrational levels

“…The bending of light has been also demonstrated using transverse dragging effect [17]. The corresponding steep dispersion results in the ultra-slow or fast propagation of light pulses, [18][19][20][21][22] which can produce huge optical delays [22] and can be used for drastic modification of the phasematching conditions for Brillouin scattering [23], fourwave mixing [24], controllable switching between bunching and anti-bunching [25], storage and retrieval of pulses [27], freezing of a light pulse [28], and ultrahigh enhancement in absolute and relative rotation sensing using fast and slow light [29].…”