A method of approximating the homogeneous second derivatives of a merit function with respect to a set of design variables is presented. If these derivatives are used in an automatic lens design program, the familiar problem of stagnation may usually be avoided.
© 1978 Optical Society of America
Donald C. Dilworth, "Pseudo-second-derivative matrix and its application to automatic lens design," Appl. Opt. 17, 3372-3375 (1978)