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Mahmoud Fallahi

Mahmoud Fallahi

University of Arizona, USA

Title: High-power, high-brightness, tunable two color VECSELs

Biography

Biography: Mahmoud Fallahi

Abstract

High power, tunable two color semiconductor lasers are highly suitable for the new wavelengths generation thanks to various nonlinear conversions. Vertical external cavity surface emitting lasers (VECSELs) are of special interest due to the access to the high intracavity circulating power and wavelength control. In this talk, we will present our recently developed and patented T-cavity VECSEL capable of delivering high power, tunable two color emission will be presented. The T-cavity two-chip VECSEL allows emission of orthogonally polarized high-power collinear outputs of the two wavelengths. By composition and thickness engineering of strain-compensated multi-quantum well InGaAs active layers, a wide range of wavelengths is achieved. Intracavity birefringent filters are then used to facilitate tunability and wavelength separation between two colors. The tunability of the individual VECSEL chips in the collinear two-color T-cavity configuration enables the control of the spectral separation of the lasing peaks. A folded-cavity configuration of such laser is used for high power intracavity second harmonic and sum frequency generation of multi-watt blue and green emissions. Latest results will be reported.