title: Parametric oscillation in sodium vapor by using an external cavity.
abstract: We report on parametric oscillation in sodium atomic vapor by using an external cavity. Output powers of approximately 56 mW are obtained for both the signal and idler waves with the input coupling power of 290 mW, resulting in a conversion efficiency of 39%. The signal and idler frequencies are either upshifted or downshifted from the coupling frequency by the amount of the Na hyperfine splitting frequency, and the two waves are found to be strongly temporally correlated.
authors.affiliation: Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan.
authors.forename: Junji
authors.initials: J
authors.lastname: Okuma
authors.forename: Nobuhito
authors.initials: N
authors.lastname: Hayashi
authors.forename: Akihiko
authors.initials: A
authors.lastname: Fujisawa
authors.forename: Masaharu
authors.initials: M
authors.lastname: Mitsunaga
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Harada