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Spectroscopic evidence for the excitonic lasing mechanism in ultraviolet ZnS/ZnCdS multiple quantum well lasers

Spectroscopic evidence for the excitonic lasing mechanism in ultraviolet ZnS/ZnCdS multiple quantum well lasers We demonstrate optically pumped lasing at room temperature from ZnS/ZnCdS quantum‐well structures grown on (100) GaP substrates by molecular beam epitaxy. In the structures with the lowest Cd composition, optically pumped lasing at wavelengths as low as 333 nm (at 8 K) is observed. We present spectroscopic evidence which suggests that the stimulated emission involves states in the low‐energy tail of an inhomogeneously broadened excitonic resonance. While lasing is excitonic at low thresholds, a transition to an electron‐hole plasma mechanism may occur if the pump power approaches 100 kW cm −2 . © 1996 American Institute of Physics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Physics Letters American Institute of Physics
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