光学设计软件zemax源码：

This DLL models an nular aspheric

surface as described in:



\"Annular surfaces in annular field systems\"

By Jose M. Sasian

Opt. eng. 36 (12) P 3401-3401 December 1997



This surface is essentially an odd aspheric surface with an offset in the aspheric terms.

The sag is given by:



Z = (c*r*r) / (1+(1-((1+k)*c*c*r*r))^ 1/2 ) + a*(r-q)^2 + b*(r-q)^3 + c*(r-q)^4 + ...



Note the terms a, b, c, ... have units of length to the -1, -2, -3, ... power.-optical design software zemax source : This DLL models an annular aspheric surface as d escribed in : "Annular surfaces in annular field systems" By Jose M. Sasian Opt. eng. 36 (12) P 3401-3401 Dece This inflicted 1,997 surface is essentially an odd asp heric surface with an offset in the aspheric ter ms. The sag is given by : Z = (c * r * r) / (1 (1-((a k) * c * c * r * r)) ^ 1 / 2) a * (r - q) b ^ 2 * (r-q) * c ^ 3 (r-q) ^ 4 ... Note the terms a, b, c, ... have units of length to the -1, -2, -3, ... power.