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Proceedings Paper

Extremely low NA Yb doped preforms (<0.03) fabricated by MCVD
Author(s): Vincent Petit; Richard P. Tumminelli; John D. Minelly; Victor Khitrov
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Paper Abstract

We report the fabrication of extremely low NA preforms (<0.03), highly doped with Yb using a conventional Modified Chemical Vapor Deposition (MCVD) system. Our lowest NA preform (0.025 NA) was drawn to a 52um core step-index double-clad fiber operating in a single mode regime (M2=1.04). The fiber had a mode field diameter (MFD) and an effective area (Aeff) greater than 35um and 1000um2 respectively. In a fiber laser configuration, the efficiency was greater than 85% without any sign of photodarkening. To the best of our knowledge, by using our extremely low NA preforms we have demonstrated the largest MFD and Aeff to date for a single-mode step index double–clad Yb doped fiber without involving any micro-structuration.

Paper Details

Date Published: 11 March 2016
PDF: 7 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97282R (11 March 2016); doi: 10.1117/12.2214546
Show Author Affiliations
Vincent Petit, Coherent, Inc. (United States)
Richard P. Tumminelli, Coherent, Inc. (United States)
John D. Minelly, Coherent, Inc. (United States)
Victor Khitrov, Coherent, Inc. (United States)

Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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