We have measured the dispersion for a 632.8nm probe beam in helium neon vapor in the presence of a strong pump. Our
measurements show an average index of refraction variation of 1.27 * 10<sup>-6</sup> per GHz. This degree of dispersion could
provide up to a 33% scale factor enhancement if implemented in a Ring Laser Gyroscope (RLG), and our measurements
indicate enhancements of >100% are possible. With some modifications in this approach, the same dispersion should be
achievable in a compact system which can be integrated with existing RLGs at a reasonable cost and without drastic
increases in size, weight, or power. Further theoretical modeling is required in order to determine the maximum
achievable scale factor enhancement, and the effects on rotational measurement noise and bias stability.
This paper presents an experiment to realize both slow and fast light effects simultaneously using the Raman gain and
pump depletion in an atomic vapor. Heterodyne phase measurement shows the opposite dispersion characteristics at
pump and probe frequencies. Optical pulse propagations in the vapor medium also confirm the slow and fast light effects
due to these dispersions. The method being experimentally simple, and allowing the use of intense pulses experiencing
anomalous dispersion via the fast light, can be applied in rotation sensing and broadband detection schemes proposed
We report observation of high contrast Raman-Ramsey fringes using time delayed optical pulse pairs in a rubidium
vapor cell. The width of these fringes are not limited by saturation and provides a simpler means to produce narrow
atomic linewidths using a thermal vapor medium for compact atomic clock applications. We also demonstrate phasescanned
Raman-Ramsey fringes, with potential application to sensitive detection of trace vapors.