Conservation laws of generalized angular momentum by second-harmonic generation in underdense plasmas harmonic generationAlexis Voisine, Pierre Béjot, Franck Billard, Hugo Marroux, Olivier Faucher and Edouard HertzEPJ Web Conf., 335 (2025) 10004DOI: https://doi.org/10.1051/epjconf/202533510004