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

Clémence Jollivet; Bryce N. Samson; Lasse Leick; Lawrence Shah; Martin C. Richardson; Axel Schulzgen

doi:10.1117/1.OE.54.1.011006

25 August 2014 Comparative study of light propagation and single-mode operation in large-mode area fibers designed for 2-μm laser applications

Clémence Jollivet, Bryce N. Samson, Lasse Leick, Lawrence Shah, Martin C. Richardson, Axel Schulzgen

Author Affiliations +

Optical Engineering, Vol. 54, Issue 1, 011006 (August 2014). https://doi.org/10.1117/1.OE.54.1.011006

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.

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Clémence Jollivet, Bryce N. Samson, Lasse Leick, Lawrence Shah, Martin C. Richardson, and Axel Schulzgen "Comparative study of light propagation and single-mode operation in large-mode area fibers designed for 2-μm laser applications," Optical Engineering 54(1), 011006 (25 August 2014). https://doi.org/10.1117/1.OE.54.1.011006

Published: 25 August 2014

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