Stripe-array diode-laser in an off-axis external cavity: Theory and experiment
- Jechow, Andreas
- Lichtner, Mark
- Menzel, Ralf
- Radziunas, Mindaugas
- Skoczowsky, Danilo
- Vladimirov, Andrei G.
2010 Mathematics Subject Classification
- 78A60 37M05 78A45
2008 Physics and Astronomy Classification Scheme
- 42.55.Px 42.60.Mi 42.60.Da 42.65.Sf
- semiconductor laser array, broad area laser, synchronization, supermode
Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles $pm alpha$ 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.
- Optics Express, 17 (2009) pp. 19599-19604.