Efficient generation of octave-separating orbital angular momentum beams via forked grating array in lithium niobite crystal

被引:1
作者
Liu, Xinyu [1 ]
Wei, Dan [2 ]
Chang, Chun [1 ]
Liu, Dingwei [1 ]
Li, Juntao [1 ]
Wei, Dunzhao [1 ]
机构
[1] Sun Yat Sen Univ, Sch Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China
[2] Dongguan Univ Technol, Sch Elect Engn & Intelligentizat, Dongguan 523808, Guangdong, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
orbital angular momentum of light; second harmonic waves; quasi-phase matching; Bragg diffraction; lithium niobate; FEMTOSECOND LASER; LIGHT; SPIN;
D O I
10.1515/nanoph-2024-0174
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The concept of orbital angular momentum (OAM) of light has not only advanced fundamental physics research but also yielded a plethora of practical applications, benefitting from the abundant methods for OAM generation based on linear, nonlinear and combined schemes. The combined scheme could generate octave-separating OAM beams, potentially increasing the channels for optical communication and data storage. However, this scheme faces a challenge in achieving high conversion efficiency. In this work, we have demonstrated the generation of multiple OAM beams at both fundamental frequency and second harmonic (SH) wavelengths using a three-dimensional forked grating array with both spatial chi(1) and chi(2) distributions in a lithium niobate nonlinear photonic crystal platform. The enhancements of the fundamental and SH OAM beams have been achieved by employing linear Bragg diffraction and nonlinear Bragg diffraction, respectively, i.e., quasi-phase matching. The experimental results show that OAM beams with variable topological charges can be enhanced at different diffraction orders via wavelength or angle tuning, achieving conversion efficiencies of 60.45 % for the linear OAM beams and 1.08 x 10-4 W-1 for the nonlinear ones. This work provides a promising approach for parallel detection of OAM states in optical communications, and extends beyond OAM towards the control of structured light via cascaded linear and nonlinear processes.
引用
收藏
页码:3465 / 3476
页数:12
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