Open AccessBeam alignment based on two-dimensional power spectral density of a near-field image
Author(s) -
Shenzhen Wang,
Qiang Yuan,
Fanzi Zeng,
Xin Zhang,
Jun Zhao,
Kehong Li,
Xiaolu Zhang,
Qiao Xue,
Ying Yang,
Weizhong Dai,
Wei Zhou,
Yuanchen Wang,
Kaiyuan Zheng,
Jingqin Su,
Hu D,
Qi Zhu
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.026591
Subject(s) - optics , pinhole (optics) , beam (structure) , laser , spatial filter , spectral density , filter (signal processing) , fiducial marker , image processing , near and far field , power (physics) , physics , computer science , image (mathematics) , artificial intelligence , computer vision , telecommunications , quantum mechanics
Beam alignment is crucial to high-power laser facilities and is used to adjust the laser beams quickly and accurately to meet stringent requirements of pointing and centering. In this paper, a novel alignment method is presented, which employs data processing of the two-dimensional power spectral density (2D-PSD) for a near-field image and resolves the beam pointing error relative to the spatial filter pinhole directly. Combining this with a near-field fiducial mark, the operation of beam alignment is achieved. It is experimentally demonstrated that this scheme realizes a far-field alignment precision of approximately 3% of the pinhole size. This scheme adopts only one near-field camera to construct the alignment system, which provides a simple, efficient, and low-cost way to align lasers.