Fundamental-mode fiber-to-fiber coupling at high-power

Mats Blomqvist; Magnus Pålsson; Ola Blomster; Göran Manneberg

doi:10.1117/12.808192

27 February 2009 Fundamental-mode fiber-to-fiber coupling at high-power

Mats Blomqvist, Magnus Pålsson, Ola Blomster, Göran Manneberg

Proceedings Volume 7193, Solid State Lasers XVIII: Technology and Devices; 71930F (2009) https://doi.org/10.1117/12.808192
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

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.

Citation Download Citation

Mats Blomqvist, Magnus Pålsson, Ola Blomster, and Göran Manneberg "Fundamental-mode fiber-to-fiber coupling at high-power", Proc. SPIE 7193, Solid State Lasers XVIII: Technology and Devices, 71930F (27 February 2009); https://doi.org/10.1117/12.808192

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