4 March 2016 High-power operation of coherently coupled tapered laser diodes in an external cavity
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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.
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G. Schimmel, I. Doyen, S. Janicot, M. Hanna, P. Georges, G. Lucas-Leclin, J. Decker, P. Crump, G. Erbert, S. Kaunga-Nyirenda, D. Moss, S. Bull, E. C. Larkins, U. Witte, M. Traub, "High-power operation of coherently coupled tapered laser diodes in an external cavity", Proc. SPIE 9733, High-Power Diode Laser Technology and Applications XIV, 97330I (4 March 2016); doi: 10.1117/12.2211613; https://doi.org/10.1117/12.2211613

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