INFLUENCE OF GAUSSIAN BEAM ANGLE ERROR ON EIGENMODE POLARIZATION LOSS IN A TOTAL REFLECTION PRISM RESONATOR

This paper guides students to combine the characteristics of Gaussian beams learned in the course of Laser Principles and Technology with the principle of Brewster's law. Taking the Total Reflection Prism (TRP) resonator as an example, the impact of incident angle error on the polarization loss of eigenmodes in the resonator during the total reflection process of Gaussian beams on the TRP surface is studied. The influence of incident angle error, beam waist position (distance from beam waist to prism) z₀ and focal parameter f on polarization loss are discussed. The results show that in a certain range, the polarization loss of s and p components increase with the increasing of angle error, and finally tends to be stable. At the same time, for the same angle error, the polarization loss of s and p components decreases with the increase of z₀ and f, and the identical increment of z₀ and f will cause smaller polarization loss of s and p components. The research results of this article can provide a theoretical basis for the reduction of eigenmodes polarization loss, resonator structure design and optimization in TRP resonators.