Passive coherent combining of two tapered laser diodes in an interferometric external cavity

Guillaume Schimmel (1) , Ioana Doyen (1) , S Janicot (1) , Marc Hanna (1) , Patrick Georges (1) , Gaëlle Lucas-Leclin (1) , J Decker (2) , Paul Crump (2) , Götz Erbert (2)

1 Laboratoire Charles Fabry / Lasers
2 FBH - Ferdinand-Braun-Institut für Höchtstfrequenztechnik

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 6.5 W in a nearly diffraction-limited beam.

Keywords: phase-locking; Coherent beam combining; tapered diode laser; external cavity

Domains: Optics [physics.optics]; Optics / Photonic

Guillaume Schimmel, Ioana Doyen, S Janicot, Marc Hanna, Patrick Georges, et al.. Passive coherent combining of two tapered laser diodes in an interferometric external cavity. High Power Laser Diode Conference, Oct 2015, Coventry, United Kingdom. ⟨10.1109/HPD.2015.7439670⟩. ⟨hal-01257023⟩