Frequency doubling with laser beams transformed by conical refraction in a biaxial crystal

摘要

The second-harmonic generation with laser beams transformed by internal conical refraction in a biaxial crystal was studied in a cascaded two-crystal arrangement, where the biaxial crystal transformed the input Gaussian beam and another nonlinear crystal was used for frequency doubling of the produced conical refraction pattern. Several specific second-harmonic beam profiles obtained for various positions of the nonlinear crystal along the beam propagation direction are considered and discussed.