Fast switching between the ground- and excited-state lasing in a quantum-dot microdisk triggered by sub-ps pulses

Author:

Zhukov AlexeyORCID,Nadtochiy Alexey,Karaborchev Alexey,Fominykh Nikita,Makhov IvanORCID,Ivanov Konstantin,Guseva Yulia1,Kulagina Marina1,Blokhin Sergey1,Kryzhanovskaya Natalia

Affiliation:

1. Ioffe Institute

Abstract

A quantum-dot microdisk was optically pumped by continuous-wave excitation with a level sufficient for the ground-state lasing. The microdisk was additionally illuminated with sub-ps pulses of various powers. It was found that there is a critical level of pulse power that determines the subsequent transient process of the microlaser. Depending on the level of the pulsed excitation, the ground-state lasing intensity can be either enhanced (for weak pulses) or fully quenched (for strong pulses). In the latter case, the excited-state lasing is ignited for a short time. All dynamic phenomena occur on a time scale of the order of 100 ps, and the duration of the transient process as a whole (from the arrival of the excitation pulse to the restoration of steady-state intensities) lasts no more than 0.5 ns. Using this phenomenon, a microlaser can be rapidly switched between two states with the switching controlled by the level of the incoming optical pulse.

Funder

National Research University Higher School of Economics

Russian Science Foundation

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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