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We report on a solid-state laser structure being the organic counterpart ofthe Vertical External-Cavity Surface-Emitting Laser (VECSEL) design. The gainmedium is a poly (methyl methacrylate) film doped with Rhodamine 640,spin-casted onto the High-Reflectivity mirror of a plano-concave resonator.Upon pumping by 7-ns pulses at 532 nm, a diffraction-limited beam (M^2=1) wasobtained, with a conversion efficiency of 43%; higher peak powers (2kW) couldbe attained when resorting to shorter (0.5 ns) pump pulses. The spectrum wascontrolled by the thickness of the active layer playing the role of anintracavity etalon; tunability is demonstrated over up to 20 nm.

Highly-efficient, diffraction-limited laser emission from a Vertical External Cavity Surface-emitting Organic Laser