A continuous-wave dye laser having a self-pumped phase conjugator in place of its usual output mirror will slowly change its own output wavelength with time. The laser has a bandwidth of 1.5 GHz and can self-scan to either longer or shorter wavelengths over a 37-nm range. The phase conjugator uses self-pumped four-wave mixing in a BaTiO3 crystal. A ring laser that uses two-wave mixing in the same crystal is also observed to have a frequency offset of a few hertz compared with the frequency of the pumping beam. These two effects are related; both are caused by a spontaneously moving photorefractive-index grating in the BaTiO3 crystal.
© 1984 Optical Society of America
Original Manuscript: April 27, 1984
Manuscript Accepted: June 15, 1984
Published: September 1, 1984
Jack Feinberg and G. D. Bacher, "Self-scanning of a continuous-wave dye laser having a phase-conjugating resonator cavity," Opt. Lett. 9, 420-422 (1984)