Abstract
Turn-on delay of laser diodes with quantum-sized active media is investigated both theoretically and experimentally. In this research we show the striking difference in turn-on delay of quantum dot and quantum well laser diodes: With quantum-well lasers turn on delay tends to zero in the limit of high pumping, while with quantum dot lasers turn-on delay has the non-vanishing component which is independent of pumping.
Highlights
Laser diodes (LDs) with quantum-sized active media such as quantum wells (QWs) and quantum dots (QDs) are widely used and intensively studied due to their efficiency, compactness and high flexibility of properties allowing for implementation of many extremely different application-oriented constructions
We first consider the turn on delay in QW LD
The turn-on delay was derived as the time difference between the rise-up of the pump current pulse measured at the laser diode and that of the signal from the photodetector
Summary
Laser diodes (LDs) with quantum-sized active media such as quantum wells (QWs) and quantum dots (QDs) are widely used and intensively studied due to their efficiency, compactness and high flexibility of properties allowing for implementation of many extremely different application-oriented constructions. Except the seminal work [6], little attention is paid to study of the turn-on behavior of LDs where the pump is quickly changed from below to above threshold that allows to deeply explore the dynamical response under various lasing conditions. In this work we study the difference between the turn-on of QW and QD LDs with special attention to the nonlinear and non-instantaneous capturing of the carriers into a quantum dot which is known to strongly affect the recovery of QD material [7], but remains unresolved except for recent publication [8,9]
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