We describe the polarization properties of a long Nd3+-doped optical fiber laser. An intracavity prism acts as a dichroic element and fixes the polarization of the laser beam essentially in its plane of incidence. The slight birefringence of the fiber makes a wavelength-dependent phase plate that modifies the state of the polarization. In the laser output spectrum, the azimuth for the elliptically polarized field can thus rotate by several times π/2 if the fiber is long enough. This gives a channeled spectrum when observed through a polarizer.
© 1993 Optical Society of America
Original Manuscript: September 15, 1992
Published: March 1, 1993
Patrice Le Boudec, Thierry Chartier, François Sanchez, Eric Delevaque, Roland Leners, Guy Stéphan, and Pierre-Luc François, "Channeled spectrum of a fiber laser," Opt. Lett. 18, 355-357 (1993)