Author Affiliations
Abstract
1 Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
2 School of Physical Science and Technology, Soochow University, Suzhou 215006, China
We investigated the Talbot effect in an anti-parity-time (PT) symmetric synthetic photonic lattice composed of two coupled fiber loops. We calculated the band structures and found that with an increase in the gain-loss parameter, the band transitions from a real spectrum to a complex spectrum. We study the influence of phase in the Hermitian operator on the Talbot effect, and the Talbot effect disappears when the period of the input field is N > 8. Further study shows that the variation of Talbot distance can also be modulated by non-Hermitian coefficients of gain and loss. This work may find significant applications in pulse repetition-rate multiplication, temporal invisibility, and tunable intensity amplifiers.
Talbot effect synthetic dimensions anti-PT symmetry photonic lattices Chinese Optics Letters
2024, 22(3): 031901
1 山东师范大学物理与电子科学学院，光场调控及应用中心，山东省光学与光子器件技术重点实验室，山东 济南 250358
2 华东师范大学与山东师范大学光调控科学与光子集成芯片联合研究中心，上海 200241
采用溶液法合成了二维硫铟锌纳米花，并测量了其可饱和吸收参数，其中，饱和强度为675 MW/cm2，调制深度为7.8%。通过搭建1 μm 全固态激光器，获得最大输出功率为240 mW、最大重复频率为629.08 kHz、最小脉冲宽度为388 ns、相应的单脉冲能量为0.38 μJ、峰值功率为0.98 W的脉冲激光。结果表明，由于硫空位的存在，硫铟锌纳米花能够吸收能量低于其带宽的光子，在近红外区域，表现出良好的可饱和吸收特性，且在激光器中，能够获得高重复频率和短脉冲宽度的激光输出。因此，基于硫铟锌纳米材料的可饱和吸收体在调Q脉冲激光器中具有广阔的应用前景。
非线性光学 脉冲激光 可饱和吸收体 二维材料 硫空位 硫铟锌
