Narrow-band optical filter through phase conjugation by nondegenerate four-wave mixing in sodium vapor.
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.
Nilsen
J
J
California Institute of Technology, Pasadena, California 91125, USA.
Gluck
N S
NS
Yariv
A
A