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The effects of energy transfer upconversion on the performance of Tm/sup 3+/, Ho/sup 3+/-doped silica fiber lasers

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1 Author(s)
Jackson, S.D. ; Australian Photonics CRC, Sydney Univ., NSW

We report the performance characteristics of a diode-pumped Tm3+, Ho3+-doped silica fiber laser as a function of the dopant concentrations. We show, albeit indirectly, that the rates of energy transfer upconversion (ETU) are significantly increased when the Tm3+ concentration and hence rates of cross relaxation (CR) are increased. The net result of ETU is a reduction in the 3 F4 population of Tm3+ and heating of the fiber as a result of the large rates of multiphonon emission from the higher lying energy levels of Ho3+. Fibers with low Tm3+ concentrations display the highest slope efficiencies and lowest thresholds, with 95% of the Stokes efficiency limit being achieved. CR, therefore, cannot be completely harnessed as a mechanism to enhance the rate of upper laser level excitation in Tm3+, Ho3+-doped silica fiber lasers

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 17 )