Design and investigation of a low-threshold organic laser diode using mixed-order DFB cavitiesYara El Droubi, Quentin Gaimard, Jeanne Solard, Mahmoud Chakaroun and Azzedine BoudriouaEPJ Web Conf., 266 (2022) 06005DOI: https://doi.org/10.1051/epjconf/202226606005