Nonlinear Talbot self-healing in periodically poled LiNbO3 crystal

• 作者: Bingxia Wang Shan Liu Tianxiang Xu Ruwei Zhao Peixiang Lu Wieslaw Krolikowski Yan Sheng
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: Special Issue on Lithium Niobate Based Photonic Devices
• 页码范围: 50-53
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL202119.060011

摘要

The nonlinear Talbot effect is a near-field nonlinear diffraction phenomenon in which the self-imaging of periodic objects is formed by the second harmonics of the incident laser beam.We demonstrate the first,to the best of our knowledge,exam-ple of nonlinear Talbot self-healing,i.e.,the capability of creating defect-free images from faulty nonlinear optical struc-tures.In particular,we employ the tightly focused femtosecond infrared optical pulses to fabricate LiNb03 nonlinear photonic crystals and show that the defects in the form of the missing points of two-dimensional square and hexagonal periodic structures are restored in the second harmonic images at the first nonlinear Talbot plane.The observed nonlinear Talbot self-healing opens up new possibilities for defect-tolerant optical lithography and printing.