Tapered Diode Pumped Continuous Wave Alexandrite Laser

E. Beyatli1, I. Baali2, B. Sumpf3, G. Erbert3, A. Leitenstorfer4, A. Sennaroglu1, and U. Demirbas2,4

Published in:

J. Opt. Soc. Am. B, vol. 30, no. 12, pp. 3184-3192 (2013).

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We describe a low-cost and efficient Alexandrite (Cr:BeAl2O4) laser that is pumped by a high-brightness tapered diode laser. The tapered diode provides up to 1.1 W of output power and its wavelength can be fine tuned to either 680.4 nm (R1 line) or 678.5 nm (R2 line) for efficient in-line pumping. Continuous wave (cw) output powers of 200 mW, slope efficiencies as high as 38% and a cw tuning range extending from 724 nm to 816 nm have been achieved. The cw power levels and slope efficiencies are the highest demonstrated so far from such a minimal complexity and low-cost system based on the Alexandrite gain medium. Consequently, tapered diodes operating in the red spectral region have the potential to become the standard pump sources for cw Alexandrite lasers in the near future.

1 Laser Research Laboratory, Departments of Physics and Electrical-Electronics Engineering, Koc University, Rumelifeneri, Sariyer, Istanbul 34450, Turkey
2 Laser Technology Laboratory, Department of Electrical and Electronics Engineering, Antalya International University, 07190 Dosemealti, Antalya, Turkey
3 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
4 Department of Physics and Center for Applied Photonics, University of Konstanz, 78464 Konstanz, Germany

OCIS codes:

140.3580: Lasers, solid state; 140.3480: Lasers, diode pumped; 160.3380: Laser materials; 140.3600 Lasers, tunable; 140.7300 Visible lasers.