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A white light continuum was generated by focusing the terawatt 800 nm femtosecond laser pulse in Kr gas. The white light spectrum spanned in a broad wavelength range from 300 to more than 2200 nm. The white light continuum was used for the first time to perform direct absorption spectroscopy of CO 2 at around 2000 nm in a laboratory absorption cell. The present system can be used for measuring the CO 2 concentrations with an accuracy of 1–2 ppm ( ca. 0.5%) in atmosphere for around 5.5 km propagation lengths through the air.
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Somekawa et al. (2010) studied this question.
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