title: Phase-sensitive amplification via coherent population oscillations in metastable helium at room temperature.
abstract: In this Letter, we report our experimental results on phase-sensitive amplification (PSA) in a nondegenerate signal-idler configuration using ultranarrow coherent population oscillations in metastable helium at room temperature. We achieved a high PSA gain of nearly 7 with a bandwidth of 200 kHz by using the system at resonance in a single-pass scheme. Further, the measured minimum gain is close to the ideal value, showing that we have a nearly pure PSA. This is also confirmed from our phase-to-phase transfer curves measurements, illustrating that we have a nearly perfect squeezer, which is interesting for a variety of applications.
authors.forename: J
authors.initials: J
authors.lastname: Lugani
authors.forename: C
authors.initials: C
authors.lastname: Banerjee
authors.forename: M-A
authors.initials: MA
authors.lastname: Maynard
authors.forename: P
authors.initials: P
authors.lastname: Neveu
authors.forename: W
authors.initials: W
authors.lastname: Xie
authors.forename: R
authors.initials: R
authors.lastname: Ghosh
authors.forename: F
authors.initials: F
authors.lastname: Bretenaker
authors.forename: F
authors.initials: F
authors.lastname: Goldfarb