Influence of the nonparallelism in Fabry-Perot interferometer mirrors alignment on the transmission of a Gaussian beam

Based on the multi-beam interference principle, it was derived that the expression of the intensity of the transmitted beam for a Gaussian beam passing through a nonparallel F-P interferometer. As a result, the influence of the nonparallelism in Fabry-Perot interferometer mirrors alignment on the transmission of a Gaussian beam was investigated theoretically. Numerical simulations show that with the increase of the nonparallelism in Fabry-Perot interferometer mirrors alignment, the peak intensity of the transmitted beam decreases accompanied by an oscillation; the position of the peak intensity of the transmitted beam is shifted; and the root-mean-square width of the transmitted beam is changed.