Abstract
A tunable multimode unidirectional traveling-wave Ti:sapphire laser was developed to measure in situ the atmospheric absorption spectra using intracavity absorption spectroscopy. The effective absorption path length was 2100 km. and vapor lines in atmosphere with absorption coefficients of were measured with uncertainties , and the absorption coefficients were in agreement with those estimated from the HITRAN database. By tuning the wavelength, a weak absorption line with an absorption coefficient of was measured with a sensitivity of . The sensitivity was limited by the residual parasitic variation that appeared in the spectrum.
©2012 Optical Society of America
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