Acta Photonica Sinica, Volume. 52, Issue 12, 1201003(2023)
Metric Function Construction for Coherent Synthetic Vortex Beam Based on Angular Invariance of the Light Field Distribution and Its Application
In the atmospheric transmission, due to the effect of atmospheric turbulence, the Coherent Synthetic Vortex (CSV) beam will undergo wavefront distortion and lead to intensity profile aberration and Orbital Angular Momentum (OAM) mode expansion, making the CSV beam quality unable to meet the practical application requirements. In order to mitigate the wavefront phase distortion brought by turbulence, the phase correction technology based on adaptive optics is particularly important. The SPGD algorithm is widely used in adaptive optical systems without wavefront sensing because of its fast convergence speed and high convergence accuracy. However, the performance of the Stochastic Parallel Gradient Descent (SPGD) algorithm depends on the accuracy of metric function.Given the uniqueness of the CSV beam, it is necessary to develop a new metric function by evaluating the light field features of the CSV beam. By theoretical analysis, it is known that the intensity of the CSV beam is distributed periodically in the angular direction. Since the periodic variation feature is independent of transmission distance and array structure parameters, the angular fringe contrast, which evaluates energy concentration in the bright fringe and prevents energy accumulation in the dark fringe, is an appropriate metric function.When
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Guangwei QIN, Wenke XIE, Xingjian ZOU, Tao YU, Qiao XIE. Metric Function Construction for Coherent Synthetic Vortex Beam Based on Angular Invariance of the Light Field Distribution and Its Application[J]. Acta Photonica Sinica, 2023, 52(12): 1201003
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Received: Apr. 23, 2023
Accepted: Jun. 25, 2023
Published Online: Feb. 19, 2024
The Author Email: XIE Wenke (wenkexiedan@163.com)