Two-color laser wavelength effect on intense terahertz generation in air

doi:10.1088/1674-1056/26/11/114206

中国物理B ›› 2017, Vol. 26 ›› Issue (11): 114206-114206.doi: 10.1088/1674-1056/26/11/114206

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Two-color laser wavelength effect on intense terahertz generation in air

Shufen Li(李淑芬), Chenhui Lu(卢晨晖), Chengshuai Yang(杨承帅), Yanzhong Yu(余燕忠), Zhenrong Sun(孙真荣), Shian Zhang(张诗按)

1. College of Physics and Information Engineering and Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Quanzhou 362000, China;
2. State Key Laboratory of Precision Spectroscopy, and School of Physics and Materials Science, East China Normal University, Shanghai 200062, China;
3. College of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
4. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

收稿日期:2017-02-26 修回日期:2017-05-30 出版日期:2017-11-05 发布日期:2017-11-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51132004, 11604205, and 11474096), Science and Technology Commission of Shanghai Municipality, China (Grant No. 14JC1401500), Shanghai Municipal Education Commission, China (Grant No. ZZGCD15066), and Foundation of Fujian Educational Committee, China (Grant No. JAT160412).

Two-color laser wavelength effect on intense terahertz generation in air

Shufen Li(李淑芬)^1,2, Chenhui Lu(卢晨晖)³, Chengshuai Yang(杨承帅)², Yanzhong Yu(余燕忠)¹, Zhenrong Sun(孙真荣)², Shian Zhang(张诗按)^2,4

1. College of Physics and Information Engineering and Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Quanzhou 362000, China;
2. State Key Laboratory of Precision Spectroscopy, and School of Physics and Materials Science, East China Normal University, Shanghai 200062, China;
3. College of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
4. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Received:2017-02-26 Revised:2017-05-30 Online:2017-11-05 Published:2017-11-05
Contact: Chenhui Lu, Shian Zhang E-mail:lchhuiz@163.com;sazhang@phy.ecnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51132004, 11604205, and 11474096), Science and Technology Commission of Shanghai Municipality, China (Grant No. 14JC1401500), Shanghai Municipal Education Commission, China (Grant No. ZZGCD15066), and Foundation of Fujian Educational Committee, China (Grant No. JAT160412).

摘要/Abstract

摘要： Near-IR femtosecond lasers have been proposed to produce high-field terahertz radiation in the air via the laser-plasma interaction, but the physical mechanism still needs to be further explored. In this work, we theoretically investigate the effect of the two-color laser wavelength on the terahertz generation in the air based on a transient photocurrent model. We show that the long wavelength laser excitation can greatly enhance the terahertz amplitude for a given total laser intensity. Furthermore, we utilize a local current model to illustrate the enhancement mechanism. Our analysis shows that the terahertz amplitude is determined by the superposition of contributions from individual ionization events, and for the long wavelength laser excitation, the electron production concentrates in a few ionization events and acquires the larger drift velocities, which results in the stronger terahertz radiation generation. These results will be very helpful for understanding the terahertz generation process and optimizing the terahertz output.

关键词: THz generation, two-color scheme, laser-plasma interaction, near-IR laser simulation

Abstract: Near-IR femtosecond lasers have been proposed to produce high-field terahertz radiation in the air via the laser-plasma interaction, but the physical mechanism still needs to be further explored. In this work, we theoretically investigate the effect of the two-color laser wavelength on the terahertz generation in the air based on a transient photocurrent model. We show that the long wavelength laser excitation can greatly enhance the terahertz amplitude for a given total laser intensity. Furthermore, we utilize a local current model to illustrate the enhancement mechanism. Our analysis shows that the terahertz amplitude is determined by the superposition of contributions from individual ionization events, and for the long wavelength laser excitation, the electron production concentrates in a few ionization events and acquires the larger drift velocities, which results in the stronger terahertz radiation generation. These results will be very helpful for understanding the terahertz generation process and optimizing the terahertz output.

Key words: THz generation, two-color scheme, laser-plasma interaction, near-IR laser simulation

中图分类号: (Ultrafast processes; optical pulse generation and pulse compression)

42.65.Re

32.80.Fb (Photoionization of atoms and ions) 52.50.Jm (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))

李淑芬, 卢晨晖, 杨承帅, 余燕忠, 孙真荣, 张诗按. Two-color laser wavelength effect on intense terahertz generation in air[J]. 中国物理B, 2017, 26(11): 114206-114206.

Shufen Li(李淑芬), Chenhui Lu(卢晨晖), Chengshuai Yang(杨承帅), Yanzhong Yu(余燕忠), Zhenrong Sun(孙真荣), Shian Zhang(张诗按). Two-color laser wavelength effect on intense terahertz generation in air[J]. Chin. Phys. B, 2017, 26(11): 114206-114206.

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Two-color laser wavelength effect on intense terahertz generation in air

Two-color laser wavelength effect on intense terahertz generation in air

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