Pulsed optical pumping experiments have been performed at room temperature on vertical-cavity multiple-quantum-well structures with picosecond light sources. Lasing is found to occur at various wavelengths corresponding to the longitudinal modes of the Fabry-Perot cavity. Time-resolved study of laser emission is crucial close to threshold, since it can discriminate between real laser emission and under-threshold luminescence. Because of the different net gains for the modes and because of nonlinear gain, the different lines are emitted successively under specific pumping conditions; this phenomenon could affect the operation of recently proposed multiple-wavelength vertical-cavity lasers.

© 1994 Optical Society of America

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