Second-harmonic generation of single-mode Laguerre-Gaussian beams with an improved quasi-phase-matching method.
Second-harmonic generation of single-mode Laguerre-Gaussian beams with an improved quasi-phase-matching method.
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DOI：
10.1364/oe.412145
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发表时间：
2020-12
期刊：
影响因子：
3.8
通讯作者：
Ruizhi Zhao;Yaguang Xu;Ronger Lu;Yongchuang Chen;Ji Zou;Xuhao Hong;Xudong Yuan;Yibin Ma;Xia Feng;Chao Zhang;Yiqiang Qin;Yongyuan Zhu
中科院分区：
文献类型：
--
作者：
Ruizhi Zhao;Yaguang Xu;Ronger Lu;Yongchuang Chen;Ji Zou;Xuhao Hong;Xudong Yuan;Yibin Ma;Xia Feng;Chao Zhang;Yiqiang Qin;Yongyuan Zhu
在拉盖尔-高斯（LG）光束的二次谐波产生过程中，产生的二次谐波通常由多个径向量子数不同的模组成。为了产生单模二次谐波LG光束，提出了一种改进的准相位匹配方法。在光学超晶格的设计中考虑了古伊相移的影响，并引入了相位调节项。通过改变结构参数，可以选择性地对各目标模式进行相位匹配，其纯度可达95%以上。由光学超晶格产生的单个LG模可以单独调制，并用作模分复用系统的输入信号。
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.