Conversion and manipulation of radial quantum modes in second-harmonic-generation processes

Conversion and manipulation of radial quantum modes in second-harmonic-generation processes
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二次谐波产生过程中径向量子模式的转换和操纵

DOI:
10.1103/physreva.101.023834
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发表时间:
2020-02
期刊:
影响因子:
2.9
通讯作者:
Zhu Yong-Yuan
Zhu Yong-Yuan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhao Rui-Zhi;Lu Rong-Er;Hong Xu-Hao;Feng Xia;Xu Ya-Guang;Yuan Xu-Dong;Zhang Chao;Qin Yi-Qiang;Zhu Yong-Yuan

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从非线性傍轴方程组出发,推导了拉盖尔-高斯(LG)光束的二次谐波耦合方程组。在此耦合方程组的指导下,定量地研究了二次谐波(SH)产生过程中各个LG模的转换和传输特性。此外,我们表明,一个周期性准相位匹配晶体可以作为一个集成器件,以产生一个可控的多模SH源。通过控制晶体的长度或温度,可以单独操纵SH波的每个LG模式,而不是将SH波作为一个整体来处理。这种方法可以用于模分复用系统中,以扩大通信容量,从而在光通信中有潜在的应用。
The second-harmonic generation of Laguerre-Gaussian (LG) beams is investigated in this paper with a coupled equation set deduced from the nonlinear paraxial equations. Under the guidance of this coupled equation set, the conversion and propagation characteristics for individual LG modes in the second-harmonic (SH) generation process are studied quantitatively. Furthermore, we show that a periodic quasi-phase-matching crystal can be used as an integrated device to produce a controllable multimode SH source. By controlling the length or temperature of crystal each LG mode of the SH wave can be manipulated separately, instead of treating the SH wave as a whole. This method might be useful in mode division multiplexing system to expand the communication capacity, and thus has potential applications in optical communication.
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