title: Threshold of a random laser based on Raman gain in cold atoms.
abstract: 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.
authors: Institut Non Linéaire de Nice, CNRS and Université de Nice Sophia-Antipolis, 06560 Valbonne, France. william.guerin@inln.cnrs.fr
authors: William
authors: W
authors: Guerin
authors: Nicolas
authors: N
authors: Mercadier
authors: Davide
authors: D
authors: Brivio
authors: Robin
authors: R
authors: Kaiser
mesh_terms: 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
chemical_list: D013843:Thiazines; D013844:Thiazoles; D000077239:Meloxicam