No abstract

A stimulated Brillouin fiber ring laser with a spectral width of 2 kHz and an intrinsic linewidth of less than 30 Hz has been demonstrated. Applications of such a laser include laser linewidth narrowing, microwave frequency generation, high-rate amplitude modulation, and optical inertial rotation sensing.

No abstract

We report the observation of Ramsey fringes using a stimulated, resonance Raman transition between two long-lived hyperfine ground sublevels, separated by 1772 MHz, in a sodium atomic beam. The observed fringes have a width of 650 Hz [half width at half maximum (HWHM)] for an interaction-region separation of 30 cm which is consistent with transit-time effects in a thermal sodium atomic beam. To our knowledge, these are the narrowest features recorded using optical lasers and have applications in high-re solution spectroscopy and in the development of new time and frequency standards in the microwave to submillimeter regions and possibly also in the far-ir region of the spectrum. 1 Figure 1(a) shows schematically a stimulated,

No abstract