Rear-side resonator architecture for the passive coherent combining of high-brightness laser diodes

Abstract : We describe a new coherent beam combining architecture based on passive phase-locking of emitters in an extended cavity on their rear facet, and their coherent combination on the front facet. This rear-side technique provides strong optical feedback for phase-locking while maintaining a high electrical-to-optical efficiency. Two high-brightness high-power tapered laser diodes are coherently combined using a Michelson-based cavity – the combining efficiency is above 82% and results in an output power of 6.7 W in a nearly diffraction-limited beam with an M²4σ ≤ 1.2. A semi-active automatic adjustment of the current enhances the long-term stability of the combination, while the short-term stability is passively ensured by the extended cavity. This new laser configuration exhibits the simplicity of passive self-organizing architectures, while providing a power conversion efficiency of 27% that is comparable to master-oscillator power amplifier architectures.
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Optics Letters, Optical Society of America, 2016, 41 (5), pp.950-953. 〈10.1364/OL.41.000950〉
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Guillaume Schimmel, Ioana Doyen-Moldovan, Sylvie Janicot, Marc Hanna, Jonathan Decker, et al.. Rear-side resonator architecture for the passive coherent combining of high-brightness laser diodes. Optics Letters, Optical Society of America, 2016, 41 (5), pp.950-953. 〈10.1364/OL.41.000950〉. 〈hal-01282939〉

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