Open AccessSecond-harmonic generation of single-mode Laguerre-Gaussian beams with an improved quasi-phase-matching method
Author(s) -
Ruizhi Zhao,
Yaguang Xu,
Ronger Lu,
Yongchuang Chen,
Jincheng Zou,
Xuhao Hong,
Xudong Yuan,
Yibing Ma,
Feng Xia,
Chao Zhang,
Yiqiang Qin,
Yanyan Zhu
Publication year - 2020
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.412145
Subject(s) - optics , superlattice , physics , phase matching , phase (matter) , gaussian , harmonic , laguerre polynomials , multiplexing , mode (computer interface) , single mode optical fiber , second harmonic generation , quantum mechanics , telecommunications , computer science , optical fiber , laser , operating system
In the second-harmonic generation processes involving Laguerre-Gaussian (LG) beams, the generated second-harmonic wave is generally composed of multiple modes with different radial quantum numbers. To generate single-mode second-harmonic LG beams, a type of improved quasi-phase-matching method is proposed. The Gouy phase shift has been considered in the optical superlattice designing and an adjustment phase item is introduced. By changing the structure parameters, each target mode can be phase-matched selectively, whose purity can reach up to 95%. The single LG mode generated from the optical superlattice can be modulated separately and used as the input signals in the mode division multiplexing system.