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Proceedings Paper

Fundamental mode evolution in long, large-core (>100 μm) adiabatic tapers
Author(s): Juho Kerttula; Valery Filippov; Yuri Chamorovskii; Vasily Ustimchik; Oleg G. Okhotnikov
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Paper Abstract

We have experimentally investigated fundamental mode propagation in few-meter-long adiabatic step-index tapers with high numerical aperture, core diameter up to 117μm (V=38), and tapering ratio up to 18. We confirmed single fundamental mode guiding in tapers with uniform core index profile by several experiments. We observed an annular near field distribution and degraded beam quality for large output core diameters, found to occur due to intrinsic mechanical stress in the fibers. We expect that eliminating the stress would prevent the mode deformation and allow constructing single-mode, diffraction-limited tapered large-mode-area amplifiers with a good beam shape.

Paper Details

Date Published: 22 March 2013
PDF: 9 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860121 (22 March 2013); doi: 10.1117/12.2001249
Show Author Affiliations
Juho Kerttula, Tampere Univ. of Technology (Finland)
Valery Filippov, Tampere Univ. of Technology (Finland)
Yuri Chamorovskii, Institute of Radio Engineering and Electronics (Russian Federation)
Vasily Ustimchik, Institute of Radio Engineering and Electronics (Russian Federation)
Oleg G. Okhotnikov, Tampere Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 8601:
Fiber Lasers X: Technology, Systems, and Applications
Sami T. Hendow, Editor(s)

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