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Description
The standard bow-tie (SBT) planar four-mirror optical enhancement cavity can amplify laser power, circulate laser pulses, and adjust the laser beam waist. It is widely applied in fields such as steady-state micro-bunching light sources, inverse Compton scattering light sources and fusion energy. However, the different effective radii of curvature in the sagittal and tangential directions vary with the incidence angle, which in turn leads to an elliptical cavity mode. Conventional approaches suppress this effect by restricting the transverse dimensions of the cavity, but this sacrifices the transverse design freedom of the optical enhancement cavity.
This paper proposes an elliptical cavity mode correction method using a cylindrical lens, enabling the fundamental mode at the beam waist to recover a circular shape. The method utilizes a cylindrical lens to differentially compensate the wavefront curvatures in sagittal and tangential directions, eliminating elliptical spot distortion without compressing the transverse dimensions of the cavity. Consequently, it overcomes the design constraints on the transverse size of the optical enhancement cavity and provides a new approach for designing large-volume, high-power optical enhancement cavities.
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