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Proceedings Paper

Fundamental-mode fiber-to-fiber coupling at high-power
Author(s): Mats Blomqvist; Magnus Pålsson; Ola Blomster; Göran Manneberg
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Paper Abstract

Fiber-to-fiber coupling between two different fibers is a state of the art technology. Products are available on the market where multimode fibers can be coupled with very low power loss, at very high powers (multi-kilowatt). We have, however, always been forced to accept a certain loss in beam quality, manifesting as an increase in the Beam Parameter Product (BPP). In fundamental-mode fiber-to-fiber coupling no beam quality is lost. We instead expect to have a certain power loss in the coupling. This paper addresses the problems in free-space fundamental-mode fiber-to-fiber coupling, including theoretical estimations of expected power loss, estimated demands on the stability of the optics as well as measured values on a fundamental mode fiber-to-fiber coupler. The theoretical calculations of the sensitivity of the coupling efficiency due to radial misalignment and defocus (longitudinal displacement) have been confirmed experimentally. Experimental results at 100 W laser power include 88% coupling efficiency using a large mode area fiber with mode-field diameter (MFD) of 18 μm and 75 % coupling efficiency using a single-mode fiber with MFD of 6.4 μm.

Paper Details

Date Published: 27 February 2009
PDF: 10 pages
Proc. SPIE 7193, Solid State Lasers XVIII: Technology and Devices, 71930F (27 February 2009); doi: 10.1117/12.808192
Show Author Affiliations
Mats Blomqvist, Optoskand AB (Sweden)
Magnus Pålsson, Optoskand AB (Sweden)
Ola Blomster, Optoskand AB (Sweden)
Göran Manneberg, AlbaNova Univ. Ctr., Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 7193:
Solid State Lasers XVIII: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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