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Faraday rotation measurement is used in conjunction with dual comb spectroscopy with Fabry-Perot quantum cascade lasers at 8 μm. The lasers have a spectral resolution on the order of 10 kHz while the measurement spectrum covers over 80 wavenumbers.
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Quantum cascade laser frequency combs covering up to 80 cm-1 for dual-comb spectroscopy at 8μm.
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