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

Abstract : 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.
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https://hal-ensta-paris.archives-ouvertes.fr//hal-03380749
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Submitted on : Friday, October 15, 2021 - 5:41:31 PM
Last modification on : Saturday, October 16, 2021 - 3:51:09 AM

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

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