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

Paboeuf, David; Lucas-Leclin, Gaëlle; Georges, Patrick; Michel, Nicolas; Krakowski, Michel; Lim, Jun; Sujecki, Slawomir; Larkins, Eric
November 2008
Applied Physics Letters;11/24/2008, Vol. 93 Issue 21, p211102
Academic Journal
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 two-dimensional wide-angle finite difference beam propagation method.


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