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27 February 2009 Polarization characteristics of a diode pumped Yb:GdCa4O(BO3)3 laser
Junhai Liu, Hongwei Yang, Huaijin Zhang, Jiyang Wang, Valentin Petrov
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Proceedings Volume 7193, Solid State Lasers XVIII: Technology and Devices; 71932K (2009) https://doi.org/10.1117/12.808490
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States
Abstract
GdCa4O(BO3)3 (GdCOB) is a promising host material for the trivalent Yb-ion with large splitting (>1000 cm-1) of the ground state (2F7/2) which facilitates efficient laser operation at room temperature. There have been a number of investigations in the continuous-wave (cw) regime, however, most of the previous studies ignored the issue of crystal orientation. GdCOB is a low symmetry biaxial crystal (point group m) and the absorption and emission spectra of Yb exhibit strong anisotropy. Here we report our experimental results with Yb:GdCOB crystals cut along the three principal optical axes under high-power unpolarized diode pumping in a simple plano-concave cavity. Our study reveals clearly significant anisotropy of the laser performance of Yb:GdCOB. For the y-cut crystal, polarized laser oscillation along the x- or z-axes is feasible, depending on the output coupling (T) utilized; with a specific T = 3% the two orthogonal polarization states exist simultaneously at different emission wavelengths. The laser oscillation obtained with the x- and z-cut crystals is polarized along the z- and x-axes, respectively, independent of T and the power level. Despite its complex output-coupling-dependent nature of laser oscillation, the y-cut crystal turns out to be the most promising for efficient high-power operation. A cw output power of 7.35 W at 1083-1085 nm polarized along the x-axis is obtained at room temperature, with an optical-to-optical efficiency of 63% and slope efficiency as high as 84%.
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Junhai Liu, Hongwei Yang, Huaijin Zhang, Jiyang Wang, and Valentin Petrov "Polarization characteristics of a diode pumped Yb:GdCa4O(BO3)3 laser", Proc. SPIE 7193, Solid State Lasers XVIII: Technology and Devices, 71932K (27 February 2009); https://doi.org/10.1117/12.808490
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KEYWORDS
Crystals
Laser crystals
Polarization
Continuous wave operation
Diodes
Ytterbium
Semiconductor lasers
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