Strong infrared optical signals at the wavelengths 0.991 and 1.149 μm were produced as a result of phase-matched four-photon mixing when Nd:YAG laser light was coupled into a <4-m-long piece of single-mode glass fiber. Stimulated gain was observed, and laser action was obtained with the fiber in an external cavity.
© 1987 Optical Society of America
Original Manuscript: January 29, 1987
Manuscript Accepted: April 6, 1987
Published: July 1, 1987
Walter Margulis and Ulf Österberg, "Four-photon fiber laser," Opt. Lett. 12, 519-521 (1987)