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A coherent dual-comb spectrometer at 3.4 µm for accurate line center measurement of methane

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Abstract

Doppler-broadened methane lines around 3.4 μm are measured with a coherent dual-comb spectrometer with an absolute-frequency axis. The obtained accuracy of the line-center frequency is 300 kHz, about 1 part per thousand of the linewidth.

© 2011 Optical Society of America

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