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

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

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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 pulses.Here 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 conserved.It was found that when the pump laser frequency approaches the fraction of the 391.4 nm emission[p0/5],an FID emission is emitted whereas its topological charge was identified to be 5 times of the pump laser.Due 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.

air lasingorbital angular momentumfree induction decayfemtosecond pulsesphotoionization

王凯璐、梅海城、高靖松、许亮、蒋红兵、刘一

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Shanghai Key Laboratory of Modern Optical System,University of Shanghai for Science and Technology,Shanghai 200093,China

State Key Laboratory for Mesoscopic Physics,School of Physics,Peking University,Beijing 100871,China

CAS Center for Excellence in Ultra-intense Laser Science,Shanghai 201800,China

2024

10.3788/COL202422.063201

中国光学快报(英文版)
中国光学学会 中国科学院上海光学精密机械研究所

中国光学快报(英文版)

CSTPCD
影响因子：1.305
ISSN：1671-7694
年,卷(期)：2024.22(6)