[1] [1] Downs M J, et al. Optical system for measuring the profiles of super smooth surfaces. Precis Eng, 1985,7(4) :211～215

[2] [2] Kinnstatler K,et al. Amplitude detection for focus error in optical disks using a birefrigent lens. Appl Opt, 1990,29:4408～4413

[3] [3] Ghosh J A, Chakraborty A K. High frequency enhancement using a birefringent lens. Opt Commun,1982,40:329～331

[4] [4] Zhang W Q. Ray tracing for crystal components. Acta Photonica Sinica , 1996,25(1) :79～84

[5] [5] Zhang W Q. Photon tunneling in a biaxial crystal. Acta Photonica Sinica , 1999,28(4): 360～363

[6] [6] Zhang W Q. The design principle of crystal components.Opt Commun, 2001,197:15 ～ 21

[7] [7] Zhang W Z. Design and application of a bifocus lens.Appl Opt, 1993,32(22): 4204～4208

[8] [8] Paul J,et al. Aberrations introduced by a lens made from a birefringent material. Appl Opt, 2000,39: 592～ 598