[1] J. S. Thomas, C. O. Donald. Gray-scale masks for diffractive-optics fabrication: Ⅰ. Commercial slide imagers [J]. Appl. Opt., 1995, 34(32):7507~7517
[2] V. P. Korolkov, A. I. Malyshev, V. G. Nikitin et al.. Application of gray-scale LDW-glass masks for fabrication of high-efficiency DOEs [C]. SPIE, 1999, 3633:129~138
[5] R. W. Michael, Heng Su. Laser direct-write gray-level mask and one-step etching for diffractive microlens fabrication [J]. Appl. Opt., 1998, 37(32):7568~7576
[6] K. Reimer, H. J. Quenzer, M. Jürss et al.. Micro-optic fabrication using one-level gray-tone lithography [C]. SPIE, 1997, 3008:279~288
[7] C. O. Donald, S. R. Willie. Gray-scale masks for diffractive-optics fabrication: Ⅱ. Spatially filtered halftone screens [J]. Appl. Opt., 1995, 34(32):7518~7526