Open AccessA novel design method for continuous-phase plate
Author(s) -
Chunlin Yang,
Hao Yan,
Jian Wang,
Rongzhu Zhang
Publication year - 2013
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.21.011171
Subject(s) - smoothing , optics , histogram , beam (structure) , phase (matter) , transmission (telecommunications) , field (mathematics) , surface (topology) , power (physics) , computer science , physics , telecommunications , image (mathematics) , mathematics , geometry , artificial intelligence , computer vision , quantum mechanics , pure mathematics
A continuous-phase plate (CPP) is a key element for beam smoothing in a high-power laser system. For the beam-smoothing effect, the surface shape of a CPP is one of the most important facts. In this paper, the change law of the transmission direction of light rays has been analyzed according to the geometrical optical principle. It is discovered that the 2-dimensional histogram of a surface gradient can be used to show the far-field distribution of a CPP. Drawing on the experience of histogram modification technology in digital image processing, a novel method is proposed to design a CPP. The design steps of a 1-dimensional CPP are introduced in detail. The far-field distribution and spatial frequency spectrum of this CPP are calculated. The results show that this method is efficient and can reflect the relationship between the surface figure and the far-field distribution of a CPP directly.