Optical cavity always acts as a valuable tool for basic research and diagnostics. By using a steady-state microbunching (SSMB) technique, a cavity for a new light source is created. We present a continuous-wave optical cavity relying on a steady-state microbunching (SSMB) mechanism for a new light source. A beam evolution model is established to calculate the final beam size under different power with the help of ABCD matrics and Winkler model. A planar four-mirror cavity has been developed using a continuous-wave laser injection system with minimum phase noise. The modal instability effect is found as a result of the surface thermoelastic deformation of cavity mirrors. To eliminate the high-order modes, a pair of D-shaped mirrors are used and 30 kW intra-cavity power is obtained.
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