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Lasing of N+2 induced by filamentation in air as a probe for femtosecond coherent anti-Stokes Raman scattering

: Zhao, X.; Nolte, S.; Ackermann, R.


Optics Letters 45 (2020), No.13, pp.3661-3664
ISSN: 0146-9592
ISSN: 1539-4794
Journal Article
Fraunhofer IOF ()
optical pumping; probes; raman scattering; remote sensing; supercontinuum generation

We investigated ultrashort pulse filamentation and lasing action of N+2 for pump-probe experiments in gases. Using femtosecond coherent anti-Stokes Raman scattering, the white-light supercontinuum generated in the filament was used to excite ro-vibrational Raman transitions in air, CO2 and CH4. We show that the lasing pulse acts as a probe for the excited levels by detecting the corresponding anti-Stokes Raman spectroscopy signals. This feature may be applied to remote sensing applications, as the temporal and spatial alignment of the probe beam and the filament is intrinsically provided.