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Proceedings Paper

High-power fiber-bulk hybrid lasers
Author(s): W. Andrew Clarkson; Deyuan Shen; Jayanta K. Sahu
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Paper Abstract

We report on recent progress in power scaling of cladding-pumped Er,Yb and Tm-doped silica fiber lasers in the ~1.5μm and ~2μm spectral regimes respectively, and also on some recent developments in fiber-bulk hybrid lasers based Er:YAG and Ho:YAG operating at ~1.6μm and ~2.1μm respectively. A cladding-pumped Tm-doped silica fiber laser pumped by a beam-shaped diode-stack at 790nm and with core composition optimized for efficient 'two-for-one' cross-relaxation yielded 66W of continuous-wave output at ~2μm for 117W of launched pump power. The corresponding slope efficiency with respect to launched pump power was 61%. An Er,Yb fibre laser, cladding-pumped by two spatially-multiplexed diode-stacks at 976nm and with core composition optimized for efficient energy-transfer from Yb3+ to Er3+, yielded up to 188W of continuous-wave output at 1570nm with an average slope efficiency with respect to launched pump power of 41%. The prospects for a further increase in output power from Tm and Er,Yb fiber lasers are considered. Efficient operation of hybrid Er:YAG and Ho:YAG lasers, pumped in-band by Er,Yb and Tm doped fibre lasers operating at 1532nm and 1907nm respectively has been demonstrated. Both lasers, when operated in continuous-wave mode, had slope efficiencies with respect to incident pump power of ~80%. The Er:YAG laser produced ~60W of continuous-wave output at 1645.3nm for 82 W of incident pump power, and, in Q-switched mode, produced pulses of energy, ~5.5mJ and duration, ~81ns (FWHM) corresponding to a peak power of ~67kW at a repetition rate of 500Hz for an incident pump power limited by the onset damage to 16.8W. The prospects for further improvement in continuous-wave and Q-switched performance are discussed.

Paper Details

Date Published: 28 February 2006
PDF: 13 pages
Proc. SPIE 6100, Solid State Lasers XV: Technology and Devices, 61000A (28 February 2006); doi: 10.1117/12.660930
Show Author Affiliations
W. Andrew Clarkson, Univ. of Southampton (United Kingdom)
Deyuan Shen, Univ. of Southampton (United Kingdom)
Jayanta K. Sahu, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 6100:
Solid State Lasers XV: Technology and Devices
Hanna J. Hoffman; Ramesh K. Shori, Editor(s)

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