GERCHBERG-SAXTON ALGORITHM FOR MULTI-MODE BEAMRESHAPING

摘要

In this paper we present the results of the given intensity distribution formation in far-field by meansof liquid crystal modulator (LCM) and semipassive bimorph deformable mirror (SBDM) bothplaced in near-field. Phase delay of LCM or SBDM is calculated by means of Gerchberg-Saxtonalgorithm. It is known that Gerchberg-Saxton algorithm fails in the case of multimode beamtransformation. In this paper we suggest the modificationofsuch algorithm that allows making notonly single-mode beam transformation, but also multimode one. The phase delay of LCM or SBDMis calculated as the sum of each mode phase multiplied by its relative intensity. We discuss somepractical examples of several given intensity distributions formation from different combination oflaser transversal modes.