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arXiv · 2501.13206

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

Hamza Dely·Baptiste Chomet·Thomas Bonazzi·Djamal Gacemi·Aangela Vasanelli·Axel Evirgen·Olivier Lopez·Benoît Darquié·Filippos Kapsalidis·Jérôme Faist·Carlo Sirtori
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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 $\mu$m. 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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Hamza Dely, Baptiste Chomet, Thomas Bonazzi, Djamal Gacemi, Aangela Vasanelli, Axel Evirgen, Olivier Lopez, Benoît Darquié, Filippos Kapsalidis, Jérôme Faist, Carlo Sirtori. 2025-01-22. Heterodyne coherent detection of phase modulation in a mid-infrared unipolar device. https://doi.org/10.1364/oe.493162

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