Terahertz necklace beams generated from two-color vortex-laser-induced air plasma

被引：24

作者：

Wang, Honggeng ^{[1
,2
,3
]}

Bai, Ya ^{[1
]}

Wu, Erheng ^{[1
,2
,3
]}

Wang, Zhanshan ^{[2
]}

Liu, Peng ^{[1
]}

Liu, Chengpu ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[2] Tongji Univ, Sch Phys Sci & Engn, Inst Precis Opt Engn, China MOE,Key Lab Adv Microstruct Mat, Shanghai 200092, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

PHYSICAL REVIEW A | 2018年 / 98卷 / 01期

基金：

中国国家自然科学基金;

关键词：

CARRIER-ENVELOPE PHASE; GAS PLASMAS; PULSES; EMISSION; MODES; LIGHT; FILAMENTATION; PROPAGATION; MEDIA;

D O I：

10.1103/PhysRevA.98.013857

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A method for generating terahertz (THz) necklace beams from two-color vortex-laser-induced air plasma is proposed and theoretically investigated based on the frequency down-conversion process. The numerical demonstrations based on both the four-wave mixing and the photocurrent schemes confirm that the generated THz pulse is a shear necklace beam without orbital angular momentum (OAM), whose phase is manifested as the stepwise jump versus azimuthal angle. The origin of OAM vanishing is attributed to the fact that the phase difference between two-color field components does not contribute to the phase but only to the amplitude of the THz pulse.

引用

页数：6

共 51 条

[1] ORBITAL ANGULAR-MOMENTUM OF LIGHT AND THE TRANSFORMATION OF LAGUERRE-GAUSSIAN LASER MODES [J].