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Proceedings Paper

Crystalline fiber Ho3+:YAG laser resonantly pumped by high-spectral-brightness laser diodes
Author(s): Antoine Berrou; Thierry Ibach; Martin Schellhorn; Wentao Hu; Robert Lammert; Laurent Vaissié; Jeff Ungar; Marc Eichhorn
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Paper Abstract

Recent advances of high power and narrow bandwidth laser diodes emitting at 1.9 μm open the path to direct diode pumping of Ho3+:YAG lasers. The usual method to pump such laser is to use thulium fiber laser which has an excellent beam quality with high power and narrow bandwidth emission. The draw back of this system is the low efficiency of this fiber laser and the increased overall complexity. In this paper we present first results of resonantly diode pumping of a Ho3+:YAG laser with fiberlike geometry. The fiber coupled diode modules used for pumping in this work (BrightLockTMUltra-500) produce each 25 W at 1.91 μm with 3 nm linewidth. The fiber has a core diameter of 600 μm with 0.22 numerical aperture. The Ho3+:YAG crystal has a diameter of 1.2 mm, a length of 60 mm, a doping concentration of 0.75 at.% and is symmetrically pumped by two diode modules from both ends. Total internal reflection on the polished rod barrel allows a high pump intensity along the rod length. The Ho3+:YAG laser cavity is composed of a high reflective flat mirror and a concave output coupler with a radius of curvature of 500 mm. With an output coupler of 50 % we measured a threshold of 11 W. The maximum output power was 11.87 W with a wavelength of 2.09 μm. The incident power to output power slope efficiency was 0.38 at currently 4 % of internal losses.

Paper Details

Date Published: 15 February 2012
PDF: 6 pages
Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 823518 (15 February 2012); doi: 10.1117/12.906657
Show Author Affiliations
Antoine Berrou, Institut Franco-Allemand de Recherches de Saint-Louis (France)
Thierry Ibach, Institut Franco-Allemand de Recherches de Saint-Louis (France)
Martin Schellhorn, Institut Franco-Allemand de Recherches de Saint-Louis (France)
Wentao Hu, Laser Operations LLC / QPC Lasers Division (United States)
Robert Lammert, Laser Operations LLC / QPC Lasers Division (United States)
Laurent Vaissié, Laser Operations LLC / QPC Lasers Division (United States)
Jeff Ungar, Laser Operations LLC / QPC Lasers Division (United States)
Marc Eichhorn, Institut Franco-Allemand de Recherches de Saint-Louis (France)


Published in SPIE Proceedings Vol. 8235:
Solid State Lasers XXI: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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