SPECTROSCOPY OF A ZNCDSE ZNSSE QUANTUM-WELL DIODE-LASER IN HIGH MAGNETIC-FIELDS/

We have investigated the characteristics of green-blue II-VI semicondu ctor diode lasers at room temperature in high magnetic fields. Small s pectral shifts, less than 2 meV during the sweep of a field up to 29 T , were measured in ZnCdSe/ZnSSe single quantum well index guided diode devices. This behavior is in contrast with expectations for a. nonint eracting electron-holt gas in a quantum well system at comparable pair densities (similar to 10(12) cm(-2)), implying that the optical gain spectrum shifts diamagnetically. The measured diamagnetic shifts are i n close agreement with the low injection electroluminescence and absor ption spectra at the n = 1 heavy-hole excitonic transition of the ZnCd Se QW. (C) 1997 American lnstitute of Physics.