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Modifications of filament spectra by shaped octave-spanning laser pulses

Abstract : In this paper we examine the spectral changes in a white light laser filament due to different pulse shapes generated by a pulse-shaping setup. We particularly explore how the properties of the filament spectra can be controlled by parametrically tailored white light pulses. The experiments are carried out in a gas cell with up to 9 bars of argon. Plasma generation and self-phase modulation strongly affect the pulse in the spectral and temporal domains. By exploiting these effects we show that the pulse spectrum can be modified in a desired way by either using second-order parametric chirp functions to shift the filament spectrum to higher or lower wavelengths, or by optimizing pulse shapes with a genetic algorithm to generate more complex filament spectra. This paper is an example of the application of complex, parametrically shaped white light pulses.
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Submitted on : Wednesday, February 10, 2021 - 8:38:39 AM
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A. Patas, M. Matthews, Sylvain Hermelin, J. Gateau, J. Kasparian, et al.. Modifications of filament spectra by shaped octave-spanning laser pulses. Physical Review A, American Physical Society 2018, 98 (3), pp.033804. ⟨10.1103/PhysRevA.98.033804⟩. ⟨hal-02290281⟩



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