  A two-dimensional (2D) mathematical model of quadratically distorted (QD)
grating is established with the principles of Fraunhofer diffraction and
Fourier optics. Discrete sampling and bisection algorithm are applied for
finding numerical solution of the diffraction pattern of QD grating. This 2D
mathematical model allows the precise design of QD grating and improves the
optical performance of simultaneous multiplane imaging system.
