Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

S. A. McLaren; K. McCandless; S. Schrauth; J. Penner; R. Aden; J. M. Di Nicola

doi:10.1117/12.2647575

14 March 2023 Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air

S. A. McLaren, K. McCandless, S. Schrauth, J. Penner, R. Aden, J. M. Di Nicola

Proceedings Volume 12401, High Power Lasers for Fusion Research VII; 1240108 (2023) https://doi.org/10.1117/12.2647575
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Stimulated rotational Raman scattering in air is a powerful parasitic process that degrades high intensity pulses propagated over significant distances. Through this inelastic scattering process, laser photons are converted to higher (Anti-Stokes) or lower (Stokes) energies, according to rotational mode transitions in the nitrogen and oxygen molecules. The full wave-mixing problem involves numerous frequencies including both Stokes and Anti- Stokes processes, multiple rotational line transitions, and multi-harmonic generation, with each generated field acting as a seed for subsequent scattering processes. Multiple numerical models of these processes were integrated into Lawrence Livermore National Laboratory’s in-house nonlinear optical chain propagation software, Virtual Beamline++. The complex spatio-temporal dynamics of single, and multi-frequency stimulated rotational Raman scattering are highlighted and discussed. General limitations of steady-state, dynamic two-level, multi-harmonic, and multi-rotational models are demonstrated and compared.

Conference Presentation

Citation Download Citation

S. A. McLaren, K. McCandless, S. Schrauth, J. Penner, R. Aden, and J. M. Di Nicola "Four-dimensional multi-level stimulated rotational Raman scattering dynamics in air", Proc. SPIE 12401, High Power Lasers for Fusion Research VII, 1240108 (14 March 2023); https://doi.org/10.1117/12.2647575

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