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Optical Engineering

Comparative study of light propagation and single-mode operation in large-mode area fibers designed for 2-μm laser applications
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Paper Abstract

Output performances of fiber-based optical systems, in particular fiber lasers and amplifiers, can be controlled using tailored fiber designs, gain profiles, and pump light overlap with the gain medium. Here, the performances of 2-μm light, propagating in three large-mode area fibers, a step-index fiber, a photonic crystal fiber (PCF), and a leakage channel fiber (LCF), designed to deliver a single-mode (SM) beam at this wavelength, were compared. Using the S2 imaging technique, the transverse mode content has been decomposed, and propagation losses, SM purity, and mode-field area (MFA) were measured for various input mode overlap and coiling diameters. It was experimentally demonstrated that coiling the PCF and LCF to 40 and 20 cm in diameter, respectively, resulted in efficient higher-order mode suppression, pure SM beam delivery, moderate (∼1  dB ) coil-induced losses in the fundamental mode, and nondistorted, large MFA (∼1600  μm2 ) beam delivery.

Paper Details

Date Published: 25 August 2014
PDF: 7 pages
Opt. Eng. 54(1) 011006 doi: 10.1117/1.OE.54.1.011006
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Clémence Jollivet, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Bryce N. Samson, Nufern (United States)
Lasse Leick, NKT Photonics A/S (Denmark)
Lawrence Shah, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Martin C. Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Axel Schulzgen, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


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