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Applied Optics

Applied Optics


  • Vol. 29, Iss. 9 — Mar. 20, 1990
  • pp: 1268–1276

Output saturation in fiber lasers

Richard S. Quimby  »View Author Affiliations

Applied Optics, Vol. 29, Issue 9, pp. 1268-1276 (1990)

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An analytical theory is developed for a four-level cw fiber laser which accounts for saturation of the output due to bleaching of the pump transition. A simple closed form expression is obtained which relates the pump power and output power. Output saturation is most important for systems having at least one long lived excited state other than the upper laser level. The model is used to optimize the fiber length, core radius, and mirror reflectivities for an Er3+ doped fluorozirconate fiber laser operating at 2.7 μm. The optimized efficiency is found to be independent of pump power. Maximum efficiencies of 9.8 and 12.9% are calculated for fibers with attenuation coefficients of 100 and 10 dB/km, respectively.

© 1990 Optical Society of America

Original Manuscript: June 8, 1989
Published: March 20, 1990

Richard S. Quimby, "Output saturation in fiber lasers," Appl. Opt. 29, 1268-1276 (1990)

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