Intraband carrier photoexcitation in quantum dot lasers.
We unveil the role of bound-to-continuum photoexcitation of carriers as a relevant process that affects the performance of quantum dot (QD) lasers. We present the response of an InAs/InGaAs QD laser to a sub-band gap pump, showing an unexpected depletion of the emitted photons. We relate this observation with carrier photoexcitation through additional transmission and photocurrent measurements. We provide a theoretical support to the experimental data and highlight the important role of this process in the laser characteristics.
Moreno
P
P
Ecole Polytechnique Fédérale de Lausanne, Institute of Quantum Electronics and Photonics, Switzerland. pablo.moreno@epfl.ch
Richard
M
M
Rossetti
M
M
Portella-Oberli
M
M
Li
L H
LH
Deveaud-Plédran
B
B
Fiore
A
A