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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 4038–4049

Experimental evidence of a nonlinear loss mechanism in highly doped Yb:LuAG crystal

Angela Pirri, Guido Toci, Martin Nikl, Vladimir Babin, and Matteo Vannini  »View Author Affiliations


Optics Express, Vol. 22, Issue 4, pp. 4038-4049 (2014)
http://dx.doi.org/10.1364/OE.22.004038


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Abstract

We report a rigorous study of the spectroscopic, laser and thermal properties of a 10at.% and a 15at.% Yb:LuAG crystals. A loss mechanism is observed in the medium with the highest doping, pumped at 936 nm and 968 nm, as a sharp and dramatic decrease of the laser output power is measured at higher excitation densities. The nonlinearity of the loss mechanism is confirmed by the fluorescence data and by the thermal lens. In particular, the dioptric power of the thermal lens acquired at different pumping levels shows a strong deviation of the expected linear trend. Here we report the influence of both the concentration and the ion excitation density of Yb3+ on the output powers, the slope efficiencies and the thresholds. Conversely excellent results are achieved with the 10at.%, which does not show any loss mechanism as at 1046 nm it delivers 11.8 W with a slope efficiency of ηs = 82%, which is, to the best of our knowledge, the highest value reported in literature for this material.

© 2014 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
(160.3380) Materials : Laser materials

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 15, 2013
Revised Manuscript: December 13, 2013
Manuscript Accepted: December 13, 2013
Published: February 13, 2014

Citation
Angela Pirri, Guido Toci, Martin Nikl, Vladimir Babin, and Matteo Vannini, "Experimental evidence of a nonlinear loss mechanism in highly doped Yb:LuAG crystal," Opt. Express 22, 4038-4049 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-4-4038


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