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For the first time, a digital-alloy active region (DAAR) consisting of submonolayer superlattices was used in a 1.55-/spl mu/m vertical-cavity surface-emitting laser. The device showed continuous-wave operation with a room-temperature threshold current (I/sub th/) of 1.2 mA, maximum output power (P/sub max/) of 0.26 mW, and a differential quantum efficiency (/spl eta//sub d/) of 21%. These results indicate that the DAAR is at least as efficient as the analog-alloy active region and provides much better control of alloy composition and strain.
Date of Publication: July 2003