Reverse ground-state excited-state transition dynamics in two-section quantum dot semiconductor lasers: mode-locking and state-switching

Stefan Breuer; Mattia Rossetti; Wolfgang Elsässer; Lukas Drzewietzki; Paolo Bardella; Ivo Montrosset; Michel Krakowski; Mark Hopkinson

doi:10.1117/12.854418

27 April 2010 Reverse ground-state excited-state transition dynamics in two-section quantum dot semiconductor lasers: mode-locking and state-switching

Stefan Breuer, Mattia Rossetti, Wolfgang Elsässer, Lukas Drzewietzki, Paolo Bardella, Ivo Montrosset, Michel Krakowski, Mark Hopkinson

Author Affiliations +

Proceedings Volume 7720, Semiconductor Lasers and Laser Dynamics IV; 772011 (2010) https://doi.org/10.1117/12.854418
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

In this contribution reverse emission state transition of a two-section quantum dot laser at a saturable absorber bias of zero volt (short circuit) is presented where lasing and mode-locking starts first on the energetically higher first excited-state (ES) and then, with increasing gain current, additional lasing and mode-locking on the energetically lower ground-state (GS) takes place. A huge coexistence regime as well as temporal simultaneity of both GS and ES mode-locking is experimentally confirmed. At the onset of two-state mode-locking shorter pulse widths are found for the GS as compared to the ES at the same gain current. A considerable shortening of the ES pulse widths is observed when GS mode-locking starts. These state-resolved emission dynamics are confirmed by time-domain travelling-wave equation modeling. Finally, by electrically shortening the saturable absorber via an external variable resistor, a resistor Self-Electro-Optical Devices (SEED) configuration is exploited and tailored emission state control is achieved.

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Stefan Breuer, Mattia Rossetti, Wolfgang Elsässer, Lukas Drzewietzki, Paolo Bardella, Ivo Montrosset, Michel Krakowski, and Mark Hopkinson "Reverse ground-state excited-state transition dynamics in two-section quantum dot semiconductor lasers: mode-locking and state-switching", Proc. SPIE 7720, Semiconductor Lasers and Laser Dynamics IV, 772011 (27 April 2010); https://doi.org/10.1117/12.854418

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