Laser diodes (LDs) are widely used in optical wireless communication (OWC) and optical networks, and proper theoretical\nmodels are needed to precisely describe the complicated beam field of LDs. A novel mathematical model is proposed to describe\nthe vectorial field of nonparaxial LD beams. Laser beam propagation is studied using the vector Rayleigh diffraction integrals, and\nthe stationary phase method is used to find the asymptotic expansion of diffraction integral. The far-field distribution of the LD\nbeam in the plane parallel and perpendicular to the junction is considered in detail, and the computed intensity distributions of the\ntheory are compared with the corresponding measurements. This model is precise for single transverse model beam of LDs and\ncan be applied to describe the LD beams in OWC and optical networks.
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