Amplitude stabilization and active control of a terahertz quantum cascade laser with a graphene loaded split-ring-resonator array
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Peer-reviewed
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Abstract
jats:pWe demonstrate the amplitude stabilization of a 2.85 THz quantum cascade laser with a graphene loaded split-ring-resonator array acting as an external amplitude modulator. The transmittance of the modulator can be actively changed by modifying the graphene conductivity via electrostatic back-gating. The modulator operates at room temperature and is capable of actively modulating the quantum cascade laser power level and thus stabilizing the power output via a proportional-integral-derivative feedback control loop. The stability was enhanced by more than 10 times through actively tuning the modulation. Furthermore, this approach can be used to externally control the laser power with a high level of stability.</jats:p>
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40 Engineering, 4009 Electronics, Sensors and Digital Hardware, 51 Physical Sciences
Journal Title
Applied Physics Letters
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Journal ISSN
0003-6951
1077-3118
1077-3118
Volume Title
112
Publisher
AIP Publishing
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Sponsorship
Engineering and Physical Sciences Research Council (EP/P021859/1)
Engineering and Physical Sciences Research Council (EP/K016636/1)
EPSRC (1635658)
Engineering and Physical Sciences Research Council (EP/K016636/1)
EPSRC (1635658)
This work is supported by funding from the Engineering and Physical Sciences Research Council (Grant No. EP/P021859/1, HyperTerahertz–High precision terahertz spectroscopy and microscopy).