Special Section on Fiber Lasers and Applications

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

[+] Author Affiliations
Clémence Jollivet, Lawrence Shah, Martin Richardson, Axel Schülzgen

CREOL, College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, United States

Bryce Samson

Nufern, East Granby, 7 Airport Park Road, Connecticut 06026, United States

Lasse Leick

NKT Photonics, Blokken 84, Birkerød 3460, Denmark

Opt. Eng. 54(1), 011006 (Aug 25, 2014). doi:10.1117/1.OE.54.1.011006
History: Received April 30, 2014; Revised July 28, 2014; Accepted August 6, 2014
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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 (1dB) coil-induced losses in the fundamental mode, and nondistorted, large MFA (1600μm2) beam delivery.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Clémence Jollivet ; Bryce Samson ; Lasse Leick ; Lawrence Shah ; Martin Richardson, et al.
"Comparative study of light propagation and single-mode operation in large-mode area fibers designed for 2-μm laser applications", Opt. Eng. 54(1), 011006 (Aug 25, 2014). ; http://dx.doi.org/10.1117/1.OE.54.1.011006


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