Abstract

Subject of study. A low-noise suppression algorithm based on a single shot is proposed for laser complex amplitude measurements. The purpose of the work is the improvement of the well-known algorithm for measuring the complex amplitude of the field based on the determination of the phase difference. Method. The approach relies on a synchronization image acquisition system containing two charge coupled devices (CCDs), while optimizing the objective function, combining the angular spectrum method and a nonlinear optimization algorithm. Main results. The synchronization image acquisition system captures the laser synchronously along the optical axis, obtaining two laser intensity images at different cross-sectional positions. The effect of low noise is suppressed by optimizing the objective function using iterative parameters consisting of a, b, and c. In combination with the angular spectrum method and using the nonlinear optimization algorithm, the complex amplitude of the laser is retrieved from the intensity image. Additionally, extensive simulative experiments have been carried out to verify the efficiency and high accuracy of this algorithm. Practical significance. The proposed single-shot-based low-noise suppression algorithm for laser complex amplitude measurements can achieve comparable measurement accuracy both simply and quickly under low-noise conditions.

© 2024 Optica Publishing Group