Chirped photonic crystal for spatially filtered optical feedback to a broad-area laser. (28th August 2018)

• Record Type: Journal Article
• Authors: Brée, C; Gailevičius, D; Purlys, V; Werner, G G; Staliunas, K; Rathsfeld, A; Schmidt, G; Radziunas, M
• Is Part Of: Journal of optics. Volume 20:Number 9(2018:Sep.)
• Publication Date: 2018-08-28
• Subjects: optical feedback -- semiconductor laser diodes -- photonic crystals -- light-beam spatial filtering; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/aada98
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: We derive and analyze an efficient model for reinjection of spatially filtered optical feedback from an external resonator to a broad area, edge emitting semiconductor laser diode (DL). Spatial filtering is achieved by a chirped photonic crystal, with variable periodicity along the optical axis and negligible resonant backscattering. The optimal chirp is obtained from a genetic algorithm, which yields solutions that are robust against perturbations. Exemplary numerical simulations of the composite system with our optoelectronic solver indicate that spatially filtered reinjection can enhance lower-order transversal optical modes in the DL and, consequently, improve the spatial beam quality.