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Proceedings Paper

Resonantly pumped amplification in a Tm-doped large mode-area photonic crystal fiber
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Paper Abstract

Ultra-large mode area thulium-doped photonic crystal fibers (Tm:PCF) have enabled the highest peak powers in 2 micron fiber laser systems to date. However, Tm:PCFs are limited by slope efficiencies of <50% when pumped with 790 nm laser diodes. A well-known alternative is pumping at 1550 nm with erbium/ytterbium-doped fiber (Er/Yb:fiber) lasers for efficiencies approaching ~70%. However, these 1550 nm pump lasers are also relatively inefficient themselves. A recently demonstrated and more attractive approach to enable slope efficiencies over 90% in thuliumdoped step-index fibers is resonant pumping (or in-band pumping). This utilizes a high power thulium fiber laser operating at a shorter wavelength as the pump. In this manuscript, we describe an initial demonstration of resonant pumping in Tm:PCF. While the extracted power was still in the exponential regime due to pump power limitations, slope efficiencies in excess of ~64 have been observed, and there is still room for improvement. These initial results show promise for applying resonant pumping in Tm:PCF to improve efficiencies and facilitate high power scaling in ultralarge mode area systems.

Paper Details

Date Published: 4 March 2015
PDF: 6 pages
Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441R (4 March 2015); doi: 10.1117/12.2080679
Show Author Affiliations
Alex Sincore, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Lawrence Shah, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Mateusz Wysmolek, Laser Zentrum Hannover e.V. (Germany)
Robert Ryan, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Ali Abdulfattah, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Martin Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 9344:
Fiber Lasers XII: Technology, Systems, and Applications
L. Brandon Shaw, Editor(s)

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