ITERATIVE CALCULATION OF DIFFRACTIVE OPTICAL-ELEMENTS FOCUSING INTO A3-DIMENSIONAL DOMAIN AND ONTO THE SURFACE OF THE BODY OF ROTATION

The present paper deals with algorithms for calculating phase diffract ive elements aimed at focusing the laser light into three-dimensional domains or onto the surface of the body of rotation. The algorithms ar e based on the expansion of the desired transmission function of the o ptical element in terms of a suitable orthogonal basis. The moduli of the expansion coefficients are assumed to be pre-given, whereas the ar guments are free parameters of the task. Calculational results of focu sing onto the surface of a diverging and a converging cone and onto th e surface of a circular cylinder are presented.