High-power optical enhancement cavity is widely used in precision optical experiments and metrology. The absorption of cavity mirrors leads to the distortions of the mirror surface. Thermal deformation in a high-power optical enhancement cavity leads to a decrease in cavity gain due to alterations in the Gouy phase. In this paper, we establish the analytical relationship between mirror deformation and cavity gain by using the Winkler deformation model. The deformation exhibits an inverse proportionality to the square of the finesse. This significant result confirms the great sensitivity of gain to deformation in a cavity with high finesse.
High-finesse optical enhancement cavities (OECs) are powerful and versatile tools for various scientific investigations and measurements. They offer superior optical performance and have been widely researched and utilized. Finesse is a crucial parameter for OECs. It is essential to measure finesse accurately for OEC applications. Here, we outline the current development and potential applications of high-finesse OECs and introduce several finesse measurement methods. An OEC system with a length of 3.78 m is built and stable locking is achieved. Finally, the finesse is measured experimentally to be approximately 15,000 by the free spectral region (FSR) modulation method.
We present a highly stable, high-power bow-tie optical enhancement cavity (OEC) for providing modulating electric fields in steady-state microbunching (SSMB) experiments. The goals include an intra-cavity circulating power of up to 1 MW; a laser beam waist with a radius of several hundred micrometers; high optical and mechanical stability; and the OEC will be coupled with an electronic storage ring. The design and simulation results of the setup are presented, including optical parameters, mechanical design, and thermal simulation. The planar four-mirror (4M) bow-tie cavity is selected to integrate with the electron storage ring, consisting of two concave focusing mirrors and two plane mirrors. The round-trip length of the cavity is 9.317 m, corresponding to an FSR of 32.177 MHz. The cavity round-trip loss is 226 ppm, with an ideal cavity gain of 14,096 and a finesse of 27,800. The mirror surface thermoelastic deformation and cavity parameters at high circulating power are described by Winkler model and thermal effect simulation tools. Although this design is oriented toward SSMB, such highly stable, high-power OECs are also desirable in various fields.
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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