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Internal Q-switching in semiconductor lasers: high intensity pulses of the picosecond range and the spectral peculiarities

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6 Author(s)
Vainshtein, Sergey ; A.F. Ioffe Inst., Acad. of Sci., St. Petersburg, Russia ; Rossin, V.V. ; Kilpela, Ari ; Kostamovaara, J.
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Optical pulses of ~100 ps duration, and ~102 W power were obtained from the industrial single heterostructure lasers with a standard pulse generation power of ~10 W in the internal Q-switching mode. Temporal and spectral analyses allow three components to be distinguished in the laser optical pulses: ordinary delayed pulses of large duration at energies considerably lower than the energy gap, short optical pulses caused by the gain-switching effect at higher energies, and short optical pulses at the end of the current pulse (Q-switching mode) at the highest energies. A model is proposed involving band tail states as a saturable absorber causing large delays

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Quantum Electronics, IEEE Journal of  (Volume:31 ,  Issue: 6 )