Efficient nearly-circularly-polarized terahertz generation from an air plasma pumped by collinear and circularly polarized two-color laser fields

Qiying Song, Qinggang Lin, Honggeng Wang, Haizhe Zhong, Yi Cai, Shuiqin Zheng, Zhenkuan Chen, Xiaowei Lu, Xuanke Zeng, Huangcheng Shangguan, Hongyu Wang, and Shixiang Xu

Phys. Rev. A 102, 023506 – Published 4 August 2020

Abstract

Efficient circularly polarized terahertz (THz) emission is important for THz imaging technology and basic scientific research. In order to achieve this, we have made a simple, all-passive design to achieve collinear and corotating circularly polarized two-color laser fields. The collinearity allows us to manipulate accurately the relative phase between two-color lasers. For a given relative phase, our experiments show that efficient nearly-circularly-polarized THz emission can be generated from an air plasma pumped by the two-color fields. The emitted THz power is ∼2.5 times that pumped by linear-polarized two-color laser fields. Our results also indicate that nearly circularly polarization is stable against different pump power and plasma distance.

Received 24 April 2020
Accepted 10 July 2020

DOI:https://doi.org/10.1103/PhysRevA.102.023506

Physics Subject Headings (PhySH)

Electronic excitation & ionization Multiphoton or tunneling ionization & excitation Terahertz generation in plasmas

Nonlinear DynamicsPlasma PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Qiying Song^1,2, Qinggang Lin¹, Honggeng Wang^1,2, Haizhe Zhong^3,*, Yi Cai ¹, Shuiqin Zheng¹, Zhenkuan Chen¹, Xiaowei Lu¹, Xuanke Zeng¹, Huangcheng Shangguan¹, Hongyu Wang¹, and Shixiang Xu^1,†

¹Shenzhen Key Lab of Micro-Nano Photonic Information Technology, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
²Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
³International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Shenzhen University, Shenzhen, Guangdong 518060, China

^*haizhe.zhong@szu.edu.cn
^†shxxu@szu.edu.cn

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Issue

Vol. 102, Iss. 2 — August 2020

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