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

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.

arXiv comment8 pages, 5 figures

References in corpus (4)

• Experimental Demonstration of >230° Phase Modulation in Gate-Tunable Graphene-Gold Reconfigurable Mid-Infrared Metasurfaces
• Ultra-fast amplitude modulation of mid-IR free-space beams at room-temperature
• A widely tunable 10-$\mu$m quantum cascade laser phase-locked to a state-of-the-art mid-infrared reference for precision molecular spectroscopy
• Highly coherent phase-lock of an 8.1 $\mu$m quantum cascade laser to a turn-key mid-IR frequency comb

Cited by in corpus (2)

• Integrated thin film lithium niobate mid-infrared modulator
• Heterodyne coherent detection of the electric field temporal trace emitted by frequency-modulated comb lasers