We report room-temperature measurements of the spontaneous emission factor β in high-quality gain-guided GaAs/AlGaAs vertical cavity surface emitting lasers. In devices with 6-μm diameter we obtain β=2.8×10−3. The measured scaling of β with the cavity volume agrees well with classical electromagnetic model of dipole radiation. The magnitude of β exceeds that predicted by classical theory by approximately a factor of 2.
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Shtengel et al. (1994) studied this question.
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