Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows

• URL: http://arxiv.org/abs/2412.17633v1
• Date: Mon, 23 Dec 2024 15:11:30 GMT
• Title: Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows
• Authors: Mohammadreza Saemian, Livia Del Balzo, Djamal Gacemi, Yanko Todorov, Etienne Rodriguez, Olivier Lopez, Benoît Darquié, Lianhe Li, Alexander Giles Davies, Edmund Linfield, Angela Vasanelli, Carlo Sirtori,
• Abstract summary: We report room temperature heterodyne detection of a quantum cascade laser beaten with a local oscillator on a unipolar quantum photodetector.<n>The measured heterodyne noise equivalent power is six orders of magnitude lower than that obtained with direct detection.
• Score: 31.114245664719455
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report room temperature heterodyne detection of a quantum cascade laser beaten with a local oscillator on a unipolar quantum photodetector in two different atmospheric windows, at 4.8 $\mu$m and 9 $\mu$m. A noise equivalent power of few pW is measured by employing an active stabilization technique in which the local oscillator and the signal are locked in phase. The measured heterodyne noise equivalent power is six orders of magnitude lower than that obtained with direct detection.

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