Journal
OPTICS EXPRESS
Volume 17, Issue 22, Pages 19599-19604Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.019599
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- DFG Research Center MATHEON
- DFG [SFB 787]
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Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles +/-alpha depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle 2 alpha a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration. (C) 2009 Optical Society of America
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