An analytical model for self phase modulation in Yb-doped fiber laser (YDFL) describing output spectrum and its broadening with increasing power has been developed. Spectral measurements in continuous wave (CW) cladding-pumped YDFL have proved the validity of the model demonstrating hyperbolic secant shape of the spectrum and linear increase of the line width with power in 1–12 W range. At lower powers, spatial hole burning and line self-sweeping effects become important and define the lower limit for the line width.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: March 15, 2012
Revised Manuscript: May 2, 2012
Manuscript Accepted: May 6, 2012
Published: June 20, 2012
S. I. Kablukov, E. A. Zlobina, E. V. Podivilov, and S. A. Babin, "Output spectrum of Yb-doped fiber lasers," Opt. Lett. 37, 2508-2510 (2012)