计算机辅助光学设计codeVS10.ppt

May 1998 CODE V Introductory Seminar: Day 4Non-Spherical Surfaces Special Surface PropertiesAfocal SystemsZoom Systems Section 10 Non-Spherical Surfaces Special Surface Properties Non-Spherical Surface Types CODE?V has many types of non-spherical surfaces CON pure Conic section (parabola, ellipse, hyperbola) ASP 20th order polynomial Asphere CYL X or Y oriented Cylinder XTO X toroid (10th order asphere rotated about x-axis) YTO Y toroid (10th order asphere rotated about y-axis) AAS Anamorphic Asphere (different asphere in  XZ vs. YZ planes) SPL Spline surface (4 points) THG Thermal Gradient (usually computed in ENV option) MOD Lens Module (perfect lens simulation) SPS XXX family of additional Special surfaces UDS/UD2 User-Defined surface (via FORTRAN or C subroutine) Entry of Non-Spherical Surface Data Double click on surface type cell of the surface to choose its type Choose the type from dropdown list Properties are set on the Surface Type page of Surface Properties Entry of Non-Spherical Data (cont.) Non-spherical data are entered on surface type page of Surface Properties window Optimization variables are set by right clicking and choosing Vary CON - Conic Surface Equation used: r2 = x2 + y2 c is vertex curvature k is conic constant Conic constant kk = 0 sphere-1 k 0 ellipsek = -1 parabolak -1 hyperbolak 0 oblate sphere (not a true conic section) ASP - Polynomial Asphere Equation used:  r2 = x2 + y2 c is vertex curvature k is conic constant A, B, C, D, E, F, G, H, J are aspheric deformation coefficients Intersect Code (IC) tells intersection point to use Default IC Yes (intersection closest to vertex) Called Intersection Direction in GUI If CUF (Fresnel curvature) is non-zero, asphere is defined as a Fresnel surface on the specified base curvature (called Thin Fresnel type in GUI) Fresnel zones are infinitesimally small For finite zone Fresnel, use SPS FRS (Fresnel Planar Substrate in GUI) Asphere Example - Command I