Continuous-wave mirrorless lasing at 2.21 {\mu}m in sodium vapors
Alexander M. Akulshin, Felipe Pedreros Bustos, and Dmitry Budker
TL;DR
This paper reports the first demonstration of continuous-wave mirrorless lasing at 2.21 μm in sodium vapors, with potential applications in remote magnetometry and atmospheric sensing.
Contribution
It introduces a novel cw mirrorless lasing technique at 2.21 μm in sodium vapors, highlighting its dependence on magnetic field and polarization.
Findings
Lasing occurs at sub-10 mW laser power.
Lasing divergence is mainly due to gain region aspect ratio.
Lasing is magnetic field and polarization dependent.
Abstract
We demonstrate backward-directed continuous-wave (cw) emission at 2.21 {\mu}m generated on the 4P3/2-4S1/2 population-inverted transition in Na vapors two-photon excited with resonant laser light at 589 and 569 nm. Our study of power and atom-number-density threshold characteristics shows that lasing occurs at sub-10 mW total power of the applied laser light. The observed 6 mrad divergence is defined mainly by the aspect ratio of the gain region. We find that mirrorless lasing at 2.21 {\mu}m is magnetic field and polarization dependent that may be useful for remote magnetometry. The presented results could help determine the requirements for obtaining directional return from sodium atoms in the mesosphere
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