Open AccessTwo-state semiconductor laser self-mixing velocimetry exploiting coupled quantum-dot emission-states: experiment, simulation and theory
Author(s) -
Mariangela Gioannini,
Marius Dommermuth,
Lukas Drzewietzki,
I. L. Krestnikov,
D.A. Livshits,
M. Krakowski,
Stefan Breuer
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.023402
Subject(s) - physics , optics , quantum dot , quantum dot laser , excited state , semiconductor laser theory , laser , photon , velocimetry , four wave mixing , quantum optics , wavelength , optoelectronics , atomic physics , nonlinear optics
We exploit the coupled emission-states of a single-chip semiconductor InAs/GaAs quantum-dot laser emitting simultaneously on ground-state (λ(GS) = 1245 nm) and excited-state (λ(ES) = 1175 nm) to demonstrate coupled-two-state self-mixing velocimetry for a moving diffuse reflector. A 13 Hz-narrow Doppler beat frequency signal at 317 Hz is obtained for a reflector velocity of 3 mm/s, which exemplifies a 66-fold improvement in width as compared to single-wavelength self-mixing velocimetry. Simulation results reveal the physical origin of this signal, the coupling of excited-state and ground-state photons via the carriers, which is unique for quantum-dot lasers and reproduce the experimental results with excellent agreement.