Narrow-line coherently-combined tapered laser diodes in a Talbot external cavity with a volume Bragg grating

David Pabœuf (1) , Gaëlle Lucas-Leclin (1) , Patrick Georges (1) , Nicolas Michel (2) , Michel Krakowski (2) , Jun Lim (3) , Slawomir Sujecki (3) , Eric Larkins (3)

1 Laboratoire Charles Fabry de l'Institut d'Optique / Elsa
2 III-V Lab - Alcatel-Thalès III-V lab
3 The School of Electronic and Electrical Engineering

We present the phase locking of an array of index-guided tapered laser diodes. An external cavity based on the self-imaging Talbot effect has been built. A volume Bragg grating is used as the output coupler to stabilize and narrow the spectrum at 976 nm. A power of 1.7 W is achieved in the in-phase single main lobe mode with a high visibility. We have checked that each emitter is locked to the Bragg wavelength with a 100-pm spectrum linewidth. The experimental results compare well with numerical simulations performed with 2D wide angle finite difference beam propagation method.

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

David Pabœuf, Gaëlle Lucas-Leclin, Patrick Georges, Nicolas Michel, Michel Krakowski, et al.. Narrow-line coherently-combined tapered laser diodes in a Talbot external cavity with a volume Bragg grating. Applied Physics Letters, 2008, 93 (21), pp.211102. ⟨10.1063/1.3036896⟩. ⟨hal-00523602⟩