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arXiv · 2109.03864

Multi-frequency telecom fibered laser system for potassium laser cooling

Charbel Cherfan·Maxime Denis·Denis Bacquet·Michel Gamot·Samir Zemmouri·Isam Manai·Jean-François Clément·Jean-Claude Garreau·Pascal Szriftgiser·Radu Chicireanu
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Abstract

We describe a compact and versatile multi-frequency laser system for laser-cooling potassium atoms, by frequency doubling a fiber-optic telecom beam ($\simeq 1534$ or $1540$~nm). Low-power fiber-based telecom lasers and components generate a single beam containing the cooling and repumper half frequencies, subsequently amplified by high-power amplifier. A final free-space SHG stage generates a single beam with typically 2.5 W at quasi-resonant frequencies ($\simeq 767$ or $770$~nm) with high-quality mode and ready for laser cooling. This allowed to trap up to $4\times10^9$ $^{41}$K atoms with fast loading times (2.5 s) at sub-Doppler temperatures of 16~$\mu$K. This opens promising perspectives towards versatile and transportable ultracold atom setups.

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physics.atom-phcond-mat.quant-gasphysics.opticsquant-ph

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Charbel Cherfan, Maxime Denis, Denis Bacquet, Michel Gamot, Samir Zemmouri, Isam Manai, Jean-François Clément, Jean-Claude Garreau, Pascal Szriftgiser, Radu Chicireanu. 2021-09-08. Multi-frequency telecom fibered laser system for potassium laser cooling. https://doi.org/10.1063/5.0070646

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