AN ALTERNATIVE METHOD FOR THE COMPENSATION OF LASER BEAM SPATIAL DISTORTIONS BASED ON COMPUTER GENERATED HOLOGRAMS

作者：Ionel L^*

来源：Romanian Reports in Physics, 2013, 65(3): 984-996.

• spatial light modulator
• computer generated holograms
• spatial distortions correction

A fast and accurate method for the compensation of spatial distortions of the laser beam intensity profiles based on computer generated holograms (CGHs) is presented. Considering the optical beam path from a CW laser source, we simulated the aberrated intensity distribution in case of user-induced misalignments in the optical setup using a numerical ray-tracing model. To correct this aberrated intensity profile, an iterative code based on the Gerchberg-Saxton algorithm (GSA) was used to design CGHs which will be addressed on a spatial light modulator. In order to experimentally verify our numerical intensity profile correction method, two cases were investigated: the correction of the distorted intensity distribution with the aim to improve the laser beam spot profile and the achievement of a desired diffraction intensity pattern in a logo. For both cases, a specific optical setup based on two spatial light modulators was built. The results are relevant for different applications with needs of high quality laser beam profile.

• 出版日期2013