Diffractive optical elements improve vertical-cavity surface-emitting laser beam quality

摘要

We research the probability of integrating a phase-only diffractive optical element (PDOE) with Vertical-Cavity Surface-Emitting laser. The slight variation of three parameters, i.e., beam waist width, wavelength and input Gaussian distribution are taken into consideration when we design the PDOE. Basing on the projected-onto-constraint- sets algorithm, a PDOE, which splits the image Gaussian beam into two equal intensity spots with the interval 30 $mu@m between them at a certain plane, is designed. The simulation results show that the positions of two peaks keep stable and the width of them shifts slightly when the form of the incident wave shifts. The intensity distribution of wave field at the output plane can keep stable when the incident wavelength shifts between 0.66 $mu@m and 0.68 $mu@m, too. In addition, the corresponding results after the phase of PDOE being quantumlized is also shown.