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Motivated by the need to increase the second harmonic generation (SHG) efficiency of nonlinear optics with large apertures, a novel mounting configuration with active adjusting function on the SHG efficiency is proposed and mechanically and optically studied. The adjusting effects of the mounting force on the distortion and stress are analyzed by the finite element methods (FEM), as well as the contribution of the distortion and stress to the change in phase mismatch, and the SHG efficiency are theoretically stated. Further on, the SHG efficiency is calculated as a function of the mounting force. The changing trends of the distortion, stress, and the SHG efficiency with the varying mounting force are obtained, and the optimal ones are figured out. Moreover, the mechanism of the occurrence of the optimal values is studied and the adjusting strategy is put forward. Numerical results show the robust adjustment of the mounting force, as well as the effectiveness of the mounting configuration, in increasing the SHG efficiency.

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Large-aperture optical element is widely used in optical engineering and reasonable mounting results in higher performance. In order to reduce the gravitational sag induced by its own weight, three types of mounting configurations were proposed and simulated by finite element method, and the effects of axial loads and non-uniformity and asymmetry were analyzed in the same time. The results showed that full periphery mounting configuration was the optimal mounting configuration and the optimal axial load was 0.085MPa with the corresponding maximum distortion was 2.32µm, and the effects of non-uniformity and asymmetry on distortion were small.