Diffraction of Gaussian vortex beam in uniaxial crystals orthogonal to the optical axisJia Li, Yu Xin, Yanru Chen, Shixue Xu, Yongqing Wang, Muchun Zhou, Qi Zhao and Feinan ChenEur. Phys. J. Appl. Phys., 53 2 (2011) 20701DOI: https://doi.org/10.1051/epjap/2010100346