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Red microchip VECSEL array

Hastie, J.E. and Morton, L.G. and Calvez, S. and Dawson, M.D. and Leinonen, T. and Pessa, M. and Gibson, G. and Padgett, M.J. (2005) Red microchip VECSEL array. Optics Express, 13 (18). pp. 7209-7214. ISSN 1094-4087

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We report an InGaP/AlInGaP/GaAs microchip vertical-external-cavity surface emitting laser operating directly at red wavelengths and demonstrate its potential for array-format operation. Optical pumping with up to 3.3W at 532nm produced a maximum output power of 330mW at 675nm, in a single circularly-symmetric beam with M2<2. Simultaneous pumping with three separate input beams, generated using a diffractive optical element, achieved lasing from three discrete areas of the same chip. Output power of ~95mW per beam was obtained from this 3×1 array, each beam having a Gaussian intensity profile with M2<1.2. In a further development, a spatial light modulator allowed computer control over the orientation and separation of the pump beams, and hence dynamic control over the configuration of the VECSEL array.