@inproceedings{8b42edcd454b47349d2cba38b0e7e0b0,
title = "Heterodyne-enhanced Faraday rotation spectrometer",
abstract = "A novel heterodyne-enhanced Faraday rotation spectroscopic (H-FRS) system for trace gas detection of nitric oxide (NO) is demonstrated. The system is based on a quantum cascade laser emitting at ∼5.2 μm and a mercury cadmium telluride photodetector (both thermoelectrically cooled). The heterodyne detection is performed at 30MHz, where the laser relative intensity noise is significantly smaller than at low frequencies. With an implementation of active interferometer stabilization technique, the current system shows total noise level that is only 5.4 times above the fundamental shot-noise limit and the Faraday rotation angle sensitivity of 2.6 × 10 -8 rad/√Hz. The NO detection limit of 30.7 ppb-v/√Hz was achieved for the R(8.5)e NO transition using 100 Gauss magnetic field and 0.15 m optical path length.",
keywords = "Faraday rotation spectroscopy, laser spectroscopy, optical heterodyne detection, quantum cascade laser, trace gas detection",
author = "Yin Wang and Michal Nikodem and Jake Hoyne and Gerard Wysocki",
year = "2012",
doi = "10.1117/12.908593",
language = "English (US)",
isbn = "9780819489111",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Quantum Sensing and Nanophotonic Devices IX",
note = "Quantum Sensing and Nanophotonic Devices IX ; Conference date: 22-01-2012 Through 26-01-2012",
}