Journal
OPTICS EXPRESS
Volume 21, Issue 25, Pages 30707-30715Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.030707
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Two frequency-doubled combs are generated by nonlinear frequency conversion to realize spectroscopic measurements around 775 nm. Frequency-doubled interferograms are corrected in real-time by monitoring the relative instabilities between the combs at their fundamental frequency. Rubidium absorption lines are used to demonstrate the technique's accuracy and serve as absolute references to calibrate the frequency grid of computed spectra. The method allows frequency-doubled interferograms to be averaged without distortion during long periods of time. The calibrated frequency grid is validated by the measurement of the oxygen A-band. Moreover, the measurement analysis of the acetylene nu(1) + 3 nu(3) overtone band has revealed some discrepancies with previous publications. (C) 2013 Optical Society of America
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