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Proceedings Paper

Low-NA single-mode LMA photonic crystal rod fiber amplifier
Author(s): Thomas Tanggaard Alkeskjold; Marko Laurila; Lara Scolari; Jes Broeng
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Paper Abstract

Enabling Single-Mode (SM) operation in Large-Mode-Area (LMA) fiber amplifiers and lasers is critical, since a SM output ensures high beam quality and excellent pointing stability. In this paper, we demonstrate and test a new design approach for achieving ultra-low NA SM rod fibers by using a spatially Distributed Mode Filter (DMF). This approach achieves SM performance in a short and straight rod fiber and allows preform tolerances to be compensated during draw. A low-NA SM rod fiber amplifier having a mode field diameter of ~60μm at 1064nm and a pump absorption of 27dB/m at 976nm is demonstrated.

Paper Details

Date Published: 11 February 2011
PDF: 9 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141S (11 February 2011); doi: 10.1117/12.874545
Show Author Affiliations
Thomas Tanggaard Alkeskjold, NKT Photonics A/S (Denmark)
Marko Laurila, Technical Univ. of Denmark (Denmark)
Lara Scolari, NKT Photonics A/S (Denmark)
Jes Broeng, NKT Photonics A/S (Denmark)


Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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