Optical free induction decay emission carrying orbit angular momentum from ionic nitrogen enabled by multiple-photon resonance

作     者：Kailu Wang Haicheng Mei Jingsong Gao Liang Xu Hongbing Jiang Yi Liu 王凯璐;梅海城;高靖松;许亮;蒋红兵;刘一

作者机构：Shanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory for Mesoscopic PhysicsSchool of PhysicsPeking UniversityBeijing 100871China CAS Center for Excellence in Ultra-intense Laser ScienceShanghai 201800China 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2024年第22卷第6期

页      面：177-181页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported in part by the National Natural Science Foundation of China (Nos.12034013 and 12204308) the Shanghai Science and Technology Commission (No.22ZR1444100) 

主　　题：air lasing orbital angular momentum free induction decay femtosecond pulses photoionization 

摘      要：Coherent optical emission of free induction decay (FID) excited by the multiple-photon resonance has been recently observed in nitrogen ions produced by intense femtosecond laser *** we report that orbit angular momentum (OAM) of the pump laser pulses can be transferred to the much longer pulsed free induction decay emission with the OAM *** was found that when the pump laser frequency approaches the fraction of the 391.4 nm emission (ν_(0)/5),an FID emission is emitted whereas its topological charge was identified to be 5 times of the pump *** to the reduced laser intensity with a vortex pump compared to the conventional Gaussian beam,the resonant pump laser wavelength presents a redshift,and the FID signal is significantly weaker.