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Gain suppression phenomena observed in InxGa1−xN quantum well laser diodes emitting at 470nm

Kojima, K. ; Funato, M. ; Kawakami, Y. ; Nagahama, S. ; Mukai, T. ; Braun, H. ; Schwarz, U. T.



Zusammenfassung

Optical gain spectra were measured for InGaN-based laser diodes (LDs) emitting at 406 nm (LD406) and 470 nm (LD470) by employing the Hakki-Paoli method. The internal loss coefficient was as large as 35 cm(-1) for the LD470 compared to 25 cm(-1) for LD406. Moreover, gain saturation was observed at about 490 nm just below the lasing threshold, and a gain band appears at higher photon energies for ...

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