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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 16, Iss. 12 — Dec. 1, 1999
  • pp: 2178–2188

Dynamics of the output of heavily Tm-doped double-clad silica fiber lasers

Stuart D. Jackson and Terence A. King  »View Author Affiliations


JOSA B, Vol. 16, Issue 12, pp. 2178-2188 (1999)
http://dx.doi.org/10.1364/JOSAB.16.002178


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Abstract

The relaxation oscillations that are present in the output of a high-power free-running diode-pumped Tm-doped silica fiber laser are characterized and modeled. The laser operates on the  3H43H6 quasi-three-level transition and operates efficiently from ∼1.9 to ∼2.0 µm. From the measurements of the  3F43H4 fluorescence after 1.98-µm pumping of a separate, heavily Tm-doped silica fiber, it is established that the  3H4, 3H43H6, 3F4 upconversion process is significant in heavily Tm-doped silica fibers. This process causes the saturable absorption that is indicated by the presence of the relaxation oscillations. A detailed theoretical model that describes the ion-pair dynamics relevant to the Tm-doped silica system is presented. Equations for the steady-state intracavity photon density and for the steady-state population densities of the isolated and paired ions are derived. A linear stability analysis and numerical analysis are also carried out. It is established that, for large emission-to-absorption cross-section ratios that are relevant to Tm-doped silica and for pump rates for which stable output is predicted, the oscillations are weakly damped before the steady state is reached. Best agreement between the experimental and model results is achieved when all the Tm3+ ions within the present fiber are considered paired.

© 1999 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3450) Lasers and laser optics : Laser-induced chemistry
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3510) Lasers and laser optics : Lasers, fiber

Citation
Stuart D. Jackson and Terence A. King, "Dynamics of the output of heavily Tm-doped double-clad silica fiber lasers," J. Opt. Soc. Am. B 16, 2178-2188 (1999)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-16-12-2178


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