Effect of two-color laser pulse duration on intense terahertz generation at different laser intensities

Lu, Chenhui; He, Tao; Zhang, Liqiang; Zhang, Hui; Yao, Yunhua; Li, Shufen; Zhang, Shian

doi:10.1103/physreva.92.063850

Cited by 19 publications

(10 citation statements)

References 34 publications

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“…Certainly, as a theoretical description via equations, the UPPE is also used to describe the THz generation from laser-induced liquid plasma 149 , which was utilized in the scenario of THz generation from air plasma. A unified model from the principle of electrodynamics was induced to explain both single/two color excitation of THz waves from a liquid 150 . In this model, both the ponderomotive force along the laser propagation axis and the drift current perpendicular to the laser propagation axis have been considered.…”

Section: ∂E ∂Zmentioning

confidence: 99%

Terahertz generation from laser-induced plasma

Wang¹,

Zhang²

2022

OES

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Interest of the research in terahertz (THz) wave has been strongly motivated by its wide applications in the fields of physics, chemistry, biology, and engineering. Developing efficient and reliable THz source is of uttermost priority in these researches. Numerous attempts have been made in fulfilling the THz generation. Greatly benefited from the progress of the ultrafast pulses, the laser-induced-plasma is one of the auspicious tools to provide desirable THz waves, owing to its superiorities in high power threshold, intense THz signal, and ultrawide THz spectrum. This paper reviews the physics and progress of the THz generation from the laser-induced plasmas, which are produced by gas, liquid, and solid. The characteristics of the emitted THz waves are also included. There are many complicated physical processes involved in the interactions of laser-plasma, making various laser-plasma scenarios in the THz generations. In view of this, we will only focus on the THz generation classified by physical mechanisms. Finally, we discuss a perspective on the future of THz generation from the laser-induced plasma, as well as its involved challenges.

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Section: ∂E ∂Zmentioning

confidence: 99%

Terahertz generation from laser-induced plasma

Wang¹,

Zhang²

2022

OES

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“…In our simulation, the amplitude of the fundamental laser pulse E 0 is so set so that a moderate ionization degree W fi = 0.4 is produced at the standard five-color pulse, since the effects of the laser parameters will be different at higher laser intensities. [33,34] Once freed from the parent molecule, the electron will oscillate with the laser field, and the electron velocity at a subsequent time can be written as…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Finally, the THz radiation spectrum is obtained by the Fourier transform of E THz (t), i.e., E THz (ω) = FFT [E THz (t)]. Throughout this paper, we consider a Gaussian pulse envelope with τ = 80 fs, thus the THz spectrum with a narrow band in the low-frequency spectral component can be obtained, [30,34] and we also consider the THz yield…”

Section: Theoretical Modelmentioning

confidence: 99%

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Pei

Wang

et al. 2018

Chinese Phys. B

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We study theoretically intense terahertz radiation from multi-color laser pulse with uncommon frequency ratios. Comparing the two-color laser scheme, of which the uncommon frequency ratio should be set to be a specific value, we show that by using multi-color harmonic laser pulses as the first pump component, the lasers as the second pump component can be adjusted in a continuous frequency range. Moreover, these multi-color laser pulses can effectively modulate and enhance the terahertz radiation, and the terahertz yield increases with the increase of the wavelength of the uncommon pump component and is stable to the laser relative phase. Finally, we utilize the electron densities and velocities of ionization events to illustrate the physical mechanism of the intense terahertz generation.

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“…Such pulses can be used as a powerfully driven pulse for probing and controlling material properties [ 16 , 17 ] , biological macromolecules [ 4 ] , electron beam detection [ 18 ] and charged particle acceleration [ 19 , 20 ] . For instance, the mechanisms of four-wave mixing and photoionization become saturated in under-dense plasma just around the power of [ 21 – 23 ] . As laser intensity continues to improve and nanotechnology develops, terahertz sources based on ultra-intense laser irradiation of dense plasma have started to emerge [ 24 , 25 ] .…”

Section: Introductionmentioning

confidence: 99%

Extremely powerful and frequency-tunable terahertz pulses from a table-top laser–plasma wiggler

Cai,

Shou,

Geng

et al. 2023

High Pow Laser Sci Eng

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The production of broadband, terawatt terahertz (THz) pulses has been demonstrated by irradiating relativistic lasers on solid targets. However, the generation of extremely powerful, narrow-band and frequency-tunable THz pulses remains a challenge. Here, we present a novel approach for such THz pulses, in which a plasma wiggler is elaborated by a tabletop laser and a near-critical density plasma. In such a wiggler, the laser-accelerated electrons emit THz radiations with a period closely related to the plasma thickness. The theoretical model and numerical simulations predict that a THz pulse with a laser-THz energy conversion of over 2.0%, an ultra-strong field exceeding 80 GV/m, a divergence angle of approximately 20 • and a center frequency tunable from 4.4 to 1.5 THz can be generated from a laser of 430 mJ. Furthermore, we demonstrate that this method can work across a wide range of laser and plasma parameters, offering potential for future applications with extremely powerful THz pulses.

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Effect of two-color laser pulse duration on intense terahertz generation at different laser intensities

Cited by 19 publications

References 34 publications

Terahertz generation from laser-induced plasma

Terahertz generation from laser-induced plasma

Enhancement and modulation of terahertz radiation by multi-color laser pulses

Extremely powerful and frequency-tunable terahertz pulses from a table-top laser–plasma wiggler

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