Two-mirror cavity graphic analysis in resonant cavity design

Abstract

In order to more conveniently and clearly analyze the optical model property of the resonator, the logic relationship between the propagation circle and transformation circle of the dual-wavelength laser resonator and the focal length and dynamic stability of the thermal lens of the gain medium is established with propagation circle analysis method. A quasithree-level thermal stable cavity containing a single thermal disturbance center is established. According σ circle and π circle tangent requirements, the relationship between the fundamental mode spot size and the curvature radius of M1 mirror in the gain medium of quasi-three-level laser is analyzed. By analyzing the thermal stability cavity of the quasi-three-level laser cavity with single thermal disturbance center, the position and ft2 value of the plane mirror M2 (the focal length value of the Ft2 lens) are determined.