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Four-Wave Mixing in Potassium Vapor

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Abstract

In this paper we demonstrate the generation of bright, squeezed twin beams via a four-wave mixing process in warm atomic potassium vapor. The atomic transitions surrounding the probe beam frequency are completely overlapped at room temperature and above, due to Doppler broadening. This results in strong asymmetric absorption of the probe beam relative to the generated conjugate. Despite this significant absorption, quantum squeezing is shown to survive.

© 2017 Optical Society of America

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