Abstract
Ultraviolet (UV) lasers have been constructed for the first time from multiple quantum well (MQW) heterostructures of Cd x Zn 1− x S/ZnS ( x=0.11−0.31) strained-layer superlattices. Stimulated emission can be observed either under optical pumping at RT or under pulsed injection at 30 K in the spectral range of 357–390 nm. Structures of the laser were fabricated by the gaseous low-pressure MOCVD method. A spectral narrowing in the emission spectrum with increasing current in the UV injection diode was clearly observed in the vicinity of 375 nm at 30 K. An UV photodetector has been successfully prepared from this MQW system, in which a spectral responsivity at 366 nm exhibits a high efficiency of about 60 mA/W.
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