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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CB_5_3

Coherent combining of two high-brightness laser diodes phase-locked by a Michelson-type external cavity

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Abstract

Coherent beam combining (CBC) is a powerful technique to scale up the brightness of arrays of laser diodes [1]. As compared to spectral beam combining, it maintains a narrow spectral bandwidth. We investigate a new CBC architecture using a common external cavity on the back side of the lasers for phase locking, while coherent beam superposition of the phase-locked beams is realized on the front side. This technique leads to a separation of the phase-locking stage – which takes place in the common external cavity - and the beam combining stage – which is achieved outside the cavity. As a consequence, the electrical-to-optical efficiency of the phase-locked laser array is increased as compared to standard external cavity configurations.

© 2015 IEEE

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