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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.5: Poster

Friday, March 4, 2005, 16:30–19:00, Poster TU E

Room temperature threshold reduction in vertical-cavity surface-emitting lasers by injection of spin-polarized electrons — •T. Paprotta¹, J. Rudolph¹, S. Döhrmann¹, D. Hägele¹, W. Stolz², and M. Oestreich¹ — ¹Institut für Festkörperphysik, Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany — ²Department of Physics and Material Sciences Center, Philipps University Marburg, Renthof 5, D-35023 Marburg, Germany

We experimentally demonstrate the reduction of the laser threshold of a commercial GaAs/(AlGa)As vertical-cavity surface-emitting laser (VCSEL) by optical injection of spin-polarized electrons at room temperature. A rate-equation model reproduces the measured reduction of 2.5% for injected electrons with 50% spin polarization. The model predicts a threshold reduction of more than 23% for 100% spin polarization in a VCSEL-structure with codoped 7.5 nm quantum wells and a reduction of 50% in otherwise identical VCSEL-structures grown on (110) substrate.