Threshold of a random laser based on Raman gain in cold atoms.
We address the problem of achieving a random laser with a cloud of cold atoms, in which gain and scattering are provided by the same atoms. In this system, the elastic scattering cross-section is related to the complex atomic polarizability. As a consequence, the random laser threshold is expressed as a function of this polarizability, which can be fully determined by spectroscopic measurements. We apply this idea to experimentally evaluate the threshold of a random laser based on Raman gain between non-degenerate Zeeman states and find a critical optical thickness on the order of 200, which is within reach of state-of-the-art cold-atom experiments.
Guerin
William
W
Institut Non Linéaire de Nice, CNRS and Université de Nice Sophia-Antipolis, 06560 Valbonne, France. william.guerin@inln.cnrs.fr
Mercadier
Nicolas
N
Brivio
Davide
D
Kaiser
Robin
R
D000465:Algorithms; D003080:Cold Temperature; D004058:Diffusion; D007834:Lasers; D000077239:Meloxicam; D055095:Optics and Photonics; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013843:Thiazines; D013844:Thiazoles
D013843:Thiazines; D013844:Thiazoles; D000077239:Meloxicam