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Femtosecond laser source for real-time atmospheric gas sensing in the UV–visible |
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| Authors: | M. Ere-Tassou C. Przygodzki E. Fertein H. Delbarre |
| Affiliation: | Laboratoire de Physico-Chimie de l’Atmosphère, UMR CNRS 8101, Université du Littoral-Côte d’Opale, MREID, 145 Avenue Maurice Schumann, Dunkerque 59140, France |
| Abstract: | We propose an experimental method for detecting molecules in the UV–visible range using ultrashort laser pulses. Two types of sources are used: a continuum generated by 200 kHz Ti:sapphire regenerative amplifier system extending from 320 to 1100 nm, and a near-gaussian femtosecond pulse (100 fs) generated by an optical parametric amplifier. Both broadband sources allow the real-time detection of the oxygen, the nitrogen dioxide NO2 and the water vapor bands. Moreover, the concentration of NO2 can be determined within the 10 ppb sensitivity range by using a specific nonlinear fit technique. |
| Keywords: | Non-linear optical UV–visible continuum OPA Femtosecond pulses Absorption spectroscopy |
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