title: Narrow-band optical filter through phase conjugation by nondegenerate four-wave mixing in sodium vapor.
abstract: An ultrahigh-Q, tunable optical filter with a FWHM bandwidth of 41 MHz is demonstrated. The filtering is produced by nondegenerate phase conjugation through four-wave mixing in atomic-sodium vapor. The filter is observed to have a maximum quantum efficiency of 4 x 10(-3). However, degenerate phase-conjugation experiments in sodium suggest that a quantum efficiency of greater than unity can be attained on a cw basis.
authors.affiliation: California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: J
authors.initials: J
authors.lastname: Nilsen
authors.forename: N S
authors.initials: NS
authors.lastname: Gluck
authors.forename: A
authors.initials: A
authors.lastname: Yariv