Tracing Evolution of Angle-Wavelength Spectrum along the 40-m Postfilament in Corridor Air

Daria V Mokrouso (1, 2) , Dmitrii V Pushkarev (1, 2) , Nikolay A Panov (1, 2, 3) , Irina A Nikolaeva (1, 3) , Daniil E Shipilo (1) , Nikita A Zhidovtsev (3) , Georgy E Rizaev (1, 2) , Daria S Uryupina (2, 3) , Arnaud Couairon (4) , Aurélien Houard (5) , Dmitry V Skryabin (6) , Andrey B Savel'Ev (1, 3) , Olga G Kosareva (1, 3) , Leonid V Seleznev (1, 2) , Andrey A Ionin (1)

1 LPI RAS - P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow]
2 IAO - V.E. Zuev Institute of Atmospheric Optics
3 Faculty of Physics, Lomonosov Moscow State University
4 CPHT - Centre de Physique Théorique [Palaiseau]
5 ILM - Interaction Laser-Matière
6 Department of Physics

Postfilamentation channel resulting from filamentation of freely propagating 744-nm, 5-mJ, 110-fs pulse in the corridor air is examined experimentally and in simulations. The longitudinal extension of postfilament was determined to be 55–95 m from the compressor output. Using single-shot angle-wavelength spectra measurements, we observed a series of red-shifted maxima in the spectrum, localized on the beam axis with the divergence below 0.5 mrad. In the range 55–70 m, the number of maxima and their red-shift increase with the distance reaching 1 μm, while the pulse duration measured by the autocorrelation technique is approximately constant. Further on, for distances larger than 70 m and up to 95 m, the propagation is characterized by the suppressed beam divergence and unchanged pulse spectrum. The pulse duration increases due to the normal air dispersion.

Mots clés: Laser femtosecond; Laser filamenation; Nonlinear optics

Domaines: Optique [physics.optics]

Daria V Mokrouso, Dmitrii V Pushkarev, Nikolay A Panov, Irina A Nikolaeva, Daniil E Shipilo, et al.. Tracing Evolution of Angle-Wavelength Spectrum along the 40-m Postfilament in Corridor Air. Photonics, 2021, 8 (10), pp.446. ⟨10.3390/photonics8100446⟩. ⟨hal-03380749⟩