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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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20.The threshold current of the VCSEL decreasing with increasing temperature, due to the sign of the detuning between the gain maximum and the cavity mode. This leads to an improved overlap of cavity mode and gain maximum above room-temperature. Upon optical excitation even in pulsed operation, heating of the device cannot be completely avoided. Therefore, the optical excitation does not only provide additional spin-polarized carriers but also slightly reduces the threshold for electrical excitation.
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