26 January 2005 Highly efficient CW Tm,Ho:GdVO4 laser pumped by a diode
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Abstract
In this paper, we report a high efficient and high power continuous wave diode-pumped cryogenic Tm(5% at.), Ho(0.5% at.):GdVO4 laser. One pumping source of Tm,Ho:GdVO4 laser is a fiber-coupled laser diode with fiber core diameter of 0.4 mm and numerical aperture (N. A.) of 0.3, supplying 14.8 W power at 793.6 nm. Another fiber-coupled LD radiation wavelength is centered at 805 nm with 0.22 N.A. and the same core diameter delivering power of greater than 30 W. For input pump power of 13.6 W at 794.2nm, the maximum output power of 4.2W, optical-to-optical conversion efficiency of 31% and slope efficiency 38% have been attained at 2.048 μm. The maximum cw power of 7.9-W is achieved by 805 nm LD under power of 26 W, corresponding to 40% optical-optical conversion efficiency relative to absorbed pumping power, which is close to quantum limited efficiency of 2 μm laser.
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Baoquan Yao, Baoquan Yao, Wanjun He, Wanjun He, Xingbao Zhang, Xingbao Zhang, Yuezhu Wang, Yuezhu Wang, "Highly efficient CW Tm,Ho:GdVO4 laser pumped by a diode", Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); doi: 10.1117/12.574793; https://doi.org/10.1117/12.574793
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