Simple method for high beam quality laser resonator design

Abstract

We present a simple method for designing a high beam quality laser resonator, in which the astigmatism in all of the arms is facilely compensated, for the first time, to the best of our knowledge. The analytical expressions for astigmatism compensation are also derived. A folded resonator is designed using these analytical expressions, in which the astigmatic aberration of all the arms is completely eliminated. The theoretical research results show that not only the spot intensity profile’s deformation but also the phase distortion in all the arms of the laser resonator can be simultaneously and completely compensated.