Open AccessTwo-dimensional symmetrical radial sub-aperture coherence and the local precision defect elimination method for high-precision beam steering
Author(s) -
C. Wang,
Zenghui Peng,
Y. Liu,
S. Li,
Zhao Zhang,
W. Chen,
Q. Wang,
Quanquan Mu
Publication year - 2019
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.27.018751
Subject(s) - optics , coherence (philosophical gambling strategy) , beam steering , aperture (computer memory) , phased array optics , beam (structure) , grating , tilt (camera) , physics , phased array , materials science , computer science , mathematics , acoustics , telecommunications , quantum mechanics , antenna (radio) , geometry
Sub-aperture coherence (SAC) is a classical phase control method for high-precision beam steering using liquid crystal optical phased arrays (LCOPA). On this basis, radial sub-aperture coherence (RSAC) and symmetrical radial sub-aperture coherence (SRSAC) were proposed, which guarantee the stability of steering angles when the beam aperture and incident position fluctuate. In this article, the pre-existing one-dimensional SRSAC was firstly extended to a more universal 2D phase generation algorithm. Meanwhile, for the intractable problem of local precision defects caused by the basic two-dimensional variable period grating (2D-VPG) algorithm, we tracked their locations accurately and designed a targeted elimination method carefully. So these remarkable error peaks could be thoroughly removed by using 2D-SRSAC optimized by the local precision defect elimination method. Since then, all the excellent performance of 1D-SRSAC can be perfectly transplanted to 2D, which makes the non-mechanical beam steering technology using LCOPA more mature and competitive in the applications required ultra-high precision.