Stimulated emission from a Cd1−xMnxTe-CdTe multilayer structure

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Abstract
In this letter we report the first observation of stimulated emission from an optically pumped Cd1−xMnxTe‐CdTe multilayer structure. This new laser structure was grown by molecular beam epitaxy and consists of an active superlattice (SL) region containing 25 CdTe quantum wells (Lz∼150 Å) alternating with 24 Cd1−xMnxTe (x∼0.45) barriers (LB∼50 Å). The SL is sandwiched between thicker Cd1−xMnxTe cladding layers. The substrate consists of a 2‐μm‐thick buffer layer of CdTe on GaAs. The Cd1−xMnxTe‐CdTe SL lasers operate at 763–766 nm when optically pumped at ∼25 K with a cavity‐dumped argon ion laser which emits 4‐ns light pulses (514.5 nm) at a repetition rate of 3.8 MHz. The onset of laser action occurs at a peak pump power density of about 1.35×104 W/cm2. The mode spacing of the emitted laser radiation is in reasonable agreement with the spacing expected from measured cavity dimensions of the Cd1−xMnxTe‐CdTe multilayer.