Heterodyne coherent detection of phase modulation in a mid-infrared unipolar device

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Abstract
Phase modulation is demonstrated in a quantum Stark effect modulator designed to operate in the mid-infrared at wavelength around 10 µm. Both phase and amplitude modulation are simultaneously resolved through the measurement of the heterodyne signal arising from the beating of a quantum cascade laser with a highly stabilized frequency comb. The highest measured phase shift is more than 5 degrees with an associated intensity modulation of 5 %. The experimental results are in full agreement with our model in which the complex susceptibility is precisely described considering the linear voltage dependent Stark shift of the optical resonance.
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Funding Information
  • ENS-THALES Chair
  • Agence Nationale de la Recherche (CORALI (ANR-20-CE04-0006), LIGNEDEMIR (ANR-18-CE09-0035))
  • H2020 Future and Emerging Technologies (cFLOW (828893), Qombs (820419))
  • CNRS Renatech network
  • Région Ile-de-France (DIM SIRTEQ)

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