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Proceedings Paper

120W, NA_0.15 fiber coupled LD module with 125-µm clad/NA 0.22 fiber by spatial coupling method
Author(s): Yuta Ishige; Eisaku Kaji; Etsuji Katayama; Yutaka Ohki; Gábor Gajdátsy; András Cserteg
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Paper Abstract

We have fabricated a fiber coupled semiconductor laser diode module by means of spatial beam combining of single emitter broad area semiconductor laser diode chips in the 9xx nm band. In the spatial beam multiplexing method, the numerical aperture of the output light from the optical fiber increases by increasing the number of laser diodes coupled into the fiber. To reduce it, we have tried the approach to improving assembly process technology. As a result, we could fabricate laser diode modules having a light output power of 120W or more and 95% power within NA of 0.15 or less from a single optical fiber with 125-μm cladding diameter. Furthermore, we have obtained that the laser diode module maintaining high coupling efficiency can be realized even around the fill factor of 0.95. This has been achieved by improving the optical alignment method regarding the fast axis stack pitch of the laser diodes in the laser diode module. Therefore, without using techniques such as polarization combining and wavelength combining, high output power was realized while keeping small numerical aperture. This contributes to a reduction in unit price per light output power of the pumping laser diode module.

Paper Details

Date Published: 19 February 2018
PDF: 6 pages
Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140M (19 February 2018);
Show Author Affiliations
Yuta Ishige, Furukawa Electric Co., Ltd. (Japan)
Eisaku Kaji, Furukawa Electric Co., Ltd. (Japan)
Etsuji Katayama, Furukawa Electric Co., Ltd. (Japan)
Yutaka Ohki, Furukawa Electric Co., Ltd. (Japan)
Gábor Gajdátsy, Furukawa Electric Institute of Technology, Ltd. (Hungary)
András Cserteg, Furukawa Electric Institute of Technology, Ltd. (Hungary)

Published in SPIE Proceedings Vol. 10514:
High-Power Diode Laser Technology XVI
Mark S. Zediker, Editor(s)

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