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Fourth-harmonic generation of orbital angular momentum light with cascaded quasi-phase matching crystals

机译：具有级联准相位晶体的轨道角动量光的第四次谐波产生

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摘要

Orbital angular momentum (OAM) light, combined with the nonlinear process to expand the frequency range, has drawn increasing research interest in recent years. Here, we implement the first, to the best of our knowledge, experimental fourth-harmonic generation of OAM light with two cascaded quasi-phase-matching crystals. A Laguerre-Gaussian beam was transmitted through a duplet crystals system and frequency-doubled twice by two separate second-harmonic generation processes, which transduced the frequency of the OAM beam from telecom band to visible band and then to ultraviolet (UV) band. The topological charge of the OAM beam was increased substantially in the cascaded frequency conversion processes. In this experiment, we verify the OAM conservation by utilizing a specially designed interferometer, and the results correspond well with the numerical simulation. This work provides an effective method for the generation of UV OAM beams with high topological charges. (C) 2021 Optical Society of America
机译：轨道角动量（OAM）光与非线性过程相结合以扩大频率范围，近年来引起了越来越多的研究兴趣。在这里，我们实现了第一个，据我们所知，实验四次谐波产生的OAM光与两个级联准相位匹配晶体。拉盖尔-高斯光束通过duplet晶体系统传输，并通过两个独立的二次谐波产生过程倍频，将OAM光束的频率从电信波段转换到可见光波段，然后再转换到紫外线（UV）波段。在级联变频过程中，OAM光束的拓扑电荷显著增加。在本实验中，我们利用一个专门设计的干涉仪验证了OAM守恒性，结果与数值模拟吻合良好。这项工作为产生具有高拓扑电荷的UV-OAM光束提供了一种有效的方法。（2021）美国光学学会

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  • 来源
    《Optics Letters》 |2021年第2期|共4页
  • 作者

    Ge Zheng; Zhou Zhi-Yuan; Li Yan; Yang Chen; Liu Shi-Kai; Shi Bao-Sen;

  • 作者单位

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China CAS Key Lab Quantum Informat Hefei 230026 Anhui Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
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