Abstract

We have proved that compared to phase velocity and ray velocity surfaces, the group velocity surface of a monoclinic crystal has a reduced symmetry, due to the loss of the two mirror planes that contain the crystallographic $b$ axis. We have derived a formula for calculation of the group velocity of the extraordinary light traveling in a principal plane of a biaxial crystal, which takes into account the rotation of the dielectric frame due to frequency dispersion. The maximum asymmetry of the group velocity of light traveling in the $a - c$ plane is found to be 2.4% at 365 nm in ${{\rm BiB}_3}{{\rm O}_6}$ and 1.4% at 550 nm in ${{\rm Sn}_2}{{\rm P}_2}{{\rm S}_6}$.

© 2021 Optical Society of America

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