Non-reciprocal Raman gain in suspended-core and nanowire silica optical fibers

Michael M. Krause, Hagen Renner, E. Brinkmeyer

The Raman gain in suspended-core and nanowire silica optical fibers significantly depends on the relative propagation directions of the pump and Stokes waves, enabling applications for nonreciprocal components.

Rogers H. Stolen

ANDREW R. CHRAPLYVY, J. Stone, CHARLES A. BURRUS

A stimulated-Raman-gain medium at 1.56-microm wavelength, consisting of molecular deuterium dissolved in low-loss silica optical fiber and pumped by 1.06-microm Nd:YAG laser light, is described. In a 100-m-long fiber with pump power of 130 W, InGaAsP injection-laser probe light at 1.56 microm was amplified by a factor of 4000 to an output power of 150 mW. The measured stimulated-Raman-gain coefficient at 1.56 microm is 7 x 10(-12) cm/W, about equal to the Raman gain of SiO(2) at the same wavelength.

柴宏宇 Chai Hongyu, 贾维国 Jia Weiguo, 韩凤 Han Feng +3 more

Sebastian Pucher, Christian Liedl, Shu‐Wei Jin +2 more

Optical nanofibers realized as the waist of tapered silica fibers can be used to trap and optically interface laser-cooled atoms. Building on this system, we experimentally show a novel scheme for the nonreciprocal Raman amplification of light. While typically either the magneto-optical effect, a temporal modulation or an optical nonlinearity is employed to break reciprocity, in our approach, this results from the spin of the atoms forming the gain medium. By taking advantage of the inherent spin-momentum locking present in optical nanofibers, we perform an experiment in which we set the amplification direction by a suitable preparation of the atomic spin state. Our approach is general and, suitable quantum emitters provided, could also be implemented beyond the optical domain of the electromagnetic spectrum.

Yinchieh Lai, S.-S. Yu