Efficient fiber-laser pumped Ho:LuLiF4 laser

J. W. Kim; J. I. Mackenzie; Daniela Parisi; Stefano Veronesi; Mauro Tonelli; W. A. Clarkson

doi:10.1117/12.853806

19 May 2010 Efficient fiber-laser pumped Ho:LuLiF₄ laser

J. W. Kim, J. I. Mackenzie, Daniela Parisi, Stefano Veronesi, Mauro Tonelli, W. A. Clarkson

Proceedings Volume 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers; 77210V (2010) https://doi.org/10.1117/12.853806
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

We present results for an efficient Ho:LuLiF₄ laser in-band pumped by a cladding-pumped Tm-doped silica fiber laser. The polarized, tunable Tm-doped silica fiber-laser operates at 1938 nm, ideally suited for in-band pumping the 40 mm long weakly-doped (0.25 at.%) Ho:LuLiF₄ crystal. Using a simple laser resonator a maximum output power of 5.1 W was achieved at a wavelength of 2066 nm for 8.0 W of absorbed pump power, when using an output coupling mirror with 20% transmission, corresponding to a slope efficiency of 70%. At a higher cavity output coupling of 37%, the lasing wavelength shifted to a higher gain peak at 2053 nm, where a maximum output power of 5.4 W was obtained with a slope efficiency of 76%. Beam quality was measured to be M²~1.1 at the maximum output power for each resonator configuration. The spectroscopy, lifetime of the upper laser level, and the laser performance will be discussed in terms of future prospects for power scaling and further improvements in the laser efficiency.

Citation Download Citation

J. W. Kim, J. I. Mackenzie, Daniela Parisi, Stefano Veronesi, Mauro Tonelli, and W. A. Clarkson "Efficient fiber-laser pumped Ho:LuLiF₄ laser", Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77210V (19 May 2010); https://doi.org/10.1117/12.853806

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