Modal conversion of a phase-locked extended-cavity diode laser array into a single lobe

David Pabœuf (1) , Florian Emaury (1) , Sébastien de Rossi (2) , Arnaud Jérôme (2) , Michel Lamare (2) , Raymond Mercier (2) , Gaëlle Lucas-Leclin (1) , Patrick Georges (1)

1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
2 Laboratoire Charles Fabry de l'Institut d'Optique / Scop

Phase-locked operation of an array of ten diode lasers is demonstrated in an extended-cavity using the Talbot self-imaging effect. An output power up to 1.7 W has been obtained. The extracavity coherent conversion of the multilobed array supermode into a Gaussian mode is investigated theoretically based on a binary phase grating. The best configuration results in a conversion efficiency of 83%. Experimentally, the conversion efficiency reaches 50% and is limited by the imperfect coherence of the laser array. We conclude that the conversion setup provides an actual measurement of the power in the selected array supermode.

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

David Pabœuf, Florian Emaury, Sébastien de Rossi, Arnaud Jérôme, Michel Lamare, et al.. Modal conversion of a phase-locked extended-cavity diode laser array into a single lobe. Photonics Europe ; Semiconductor Lasers and Laser Dynamics IV, Apr 2010, Bruxelles, Belgium. pp.77200P 1 -77200P 7, ⟨10.1117/12.854464⟩. ⟨hal-00534755⟩