Barium atoms in a three-level lambda configuration convert 1500 nm photons to 553 nm photons at room temperature with an internal efficiency of 1.49, exceeding unity.
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Room-temperature amplified transduction of infrared to visible photons
Barium atoms in a three-level lambda configuration convert 1500 nm photons to 553 nm photons at room temperature with an internal efficiency of 1.49, exceeding unity.