| Citation: | XING Cheng-wen, XU Tian-yao, MA Chao-qun, LUAN Su-qi, LI Yue, MENG Fan-chao, MENG Ling-qiang, LV Gang, YIN Xiong-fei, JIA Jian-jun. Cavity alignment method based on gradient ascent[J]. Chinese Optics. doi: 10.37188/CO.2025-0053
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Addressing the issue of beam alignment with Fabry-Pérot cavities, this paper employs an adaptive step adjustment method of dual mirrors based on the gradient ascent of resonant mode energy, achieving mode coupling of the cavity and incident beam. By cavity mode image recognition and incident beam pointing adjustment, fundamental and higher-order modes can be excited. By utilizing the relationship between the angles of the dual mirrors and the beam pointing, it enables separate adjustment of the incident position and angle of the beam entering the cavity. Classification of different mode images using the EfficientNet neural network facilitates the recognition of fundamental and higher-order modes. Based on the energy gradient of the cavity mode, this approach adaptively adjusts the step values of the dual mirrors, enabling low-cost and efficient coupling of both fundamental and higher-order modes into the cavity. The beam pointing adjustment method proposed will offer a novel option for coupling lasers with Fabry-Pérot cavities.
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