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Birefringence controlled room-temperature picosecond spin dynamics close to the threshold of vertical-cavity surface-emitting laser devices

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6 Author(s)
Li, M.Y. ; Photonics and Terahertz Technology, Ruhr-University Bochum, Bochum D-44780, Germany ; Jahme, H. ; Soldat, H. ; Gerhardt, N.C.
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We analyze the spin-induced circular polarization dynamics at the threshold of vertical-cavity surface-emitting lasers at room-temperature using a hybrid excitation combining electrically pumping without spin preference and spin-polarized optical injection. After a short pulse of spin-polarized excitation, fast oscillations of the circular polarization degree (CPD) are observed within the relaxation oscillations. A theoretical investigation of this behavior on the basis of a rate equation model shows that these fast oscillations of CPD could be suppressed by means of a reduction of the birefringence of the laser cavity.

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Applied Physics Letters  (Volume:97 ,  Issue: 19 )