Erlangen-Nuernberg, Stuttgart, Germany. The imaging quality of such optical elements usually is described in terms of III-order aberrations. The aberration coefficients depend on the radii of curvature of waves used for the lens recording and location of its input pupil. Those factors do not result from aberrations, but are dependent on the type of recording process. Several types of lenses including kinoform, linear, nonlinear, and binary amplitude, as well as linear and binary phase diffractive lenses of the same III-order aberrations, are investigated.
Point spread function and incoherent transfer function numerically calculated are compared.
The other factor influencing the imaging quality is modulation transfer function of the recording material. The different local spatial frequency of the diffractive lens microstructure corresponds to the different local diffraction efficiency. This effect is similar to apodising and also can change the imaging characteristics. Stuttgart, Stuttgart, Germany. We modified the Fourier transform algorithm, which also allows hologram calculation for reflective type kinoforms considering the tilted arrangement.