Measurement of beam offset using wavefront distribution of vortex beam

In the field of underwater wireless optical communication, optical transmitters and optical receivers need to track and align in real time, which poses challenges to the real-time and accuracy of the measurement method for beam offset. To address this issue, a two-dimensional signal cross-correlation method based on Fourier transform is proposed to measure the beam shift using the unique spatial distribution of vortex beams, and an experimental setup is established to verify the effectiveness of the proposed method.