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Conference on Lasers and Electro-Optics

Inversionless gain in a microscale vapor cells

Eliran Talker, Yefim Barash, Noa Mazurski, Uriel Levy

Published Jan 1, 2021• 0 citations
Publisher

Abstract

We demonstrate gain without inversion towards lasing in a lossy medium, based on atomic interference in Rubidium vapor confined in microscale vapor cell. We also demonstrate the crucial role of miniaturization in achieving inversionless gain.
DOI
10.1364/cleo_at.2021.jw1a.169

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Journal of Physics B Atomic Molecular and Optical Physics•Nov 29, 2019•12 citations
We study gain without inversion due to coherence effects in a Doppler-broadened degenerate three-level system of a rubidium-hydrogen mixture in a miniaturized micron-scale custom vapor cell. The cell miniaturization gives rise to collisions of atoms with the walls of the cell. This, combined with the high collision rate with the hydrogen buffer gas, allows us to observe gain in the absorption spectra. Furthermore, we analyze the role of cell miniaturization in the evolution of the gain profile. In addition to fundamental interest, the observation of gain without inversion in our miniaturized cells paves the way for applications such as miniaturized lasers without inversion.
Abstract We demonstrate both numerically and experimentally the important role of buffer gas in achieving optical isolator based on efficient hyperfine-structure optical pumping of Rubidium (87Rb) atoms in miniaturized vapor cells. It is observed that the increase in the buffer gas pressure allows achieving highly efficient optical pumping. Specifically, at a buffer gas pressure of 40 Torr, it is possible to pump about 85% of the atoms out of the pumped state into the other ground state. While optical pumping has been reported for conventional centimeter-scale cells, we show that in miniaturized cells the role of buffer gas is crucial, as the higher collision rate with the walls diminishes the effect of optical pumping, posing a stringent limitation on the applicability of optical pumping in miniaturized systems. Following the results reported herein, we demonstrate an optical isolator with isolation ratio better than 20 dB at a relatively low temperature of about 80 °C, and with a low magnetic field (∼800 Gauss). The obtained results provide another step forward in the quest for miniaturizing quantum devices. The demonstrated device shows that such miniaturized vapor cells can be considered for applications such as all-optical switching, optical quantum memory, frequency references, and magnetometry to name a few.