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High-power operation of coherently coupled tapered laser diodes in an external cavity

: Schimmel, G.; Doyen, I.; Janicot, S.; Hanna, M.; Georges, P.; Lucas-Leclin, G.; Decker, J.; Crump, P.; Erbert, G.; Kaunga-Nyirenda, S.; Moss, D.; Bull, S.; Larkins, E.C.; Witte, U.; Traub, M.

Postprint urn:nbn:de:0011-n-3829908 (3.5 MByte PDF)
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Created on: 26.4.2016

Zediker, M.S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High-Power Diode Laser Technology and Applications XIV : San Francisco, California, February 2016
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 9733)
Paper 97330I, 11 pp.
Conference "High-Power Diode Laser Technology and Applications" <14, 2016, San Francisco/Calif.>
Conference Paper, Electronic Publication
Fraunhofer ILT ()

We demonstrate a rear-side phase-locking architecture with two high-brightness diode lasers. This technique is based on the passive phase-locking of emitters in an external cavity on their rear facet, and their coherent combination on the front facet. Two high-brightness high-power tapered laser diodes are coherently combined using a Michelson-based cavity. The combining efficiency is above 80% and results in an output power of 6.7 W in a nearly diffraction-limited beam. The rear-side architecture is then used with a laser bar of 5 tapered emitters using an interferometric extended cavity, based on a diffractive optical element. We describe the experimental evaluation of the diffractive optical element, and the phase-locked operation of the laser bar.