Power dependence of terahertz carrier frequency in a plasma-based two-color generation process

Zhao, Jinhua; Zhang, Liangliang; Luo, Yi-man; Wu, Tong; Zhang, Cunlin; Zhao, Yuejin

doi:10.1088/1674-1056/23/12/127201

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Optical interference systems are real-time, quantitative, and cost-effective; and they have been used to measure broadband pulsed terahertz waves. [15] In the present paper, we discuss an optical interference measurement system that can detect the full frequency range and energy density of continuous terahertz waves. Previous research on pulsed terahertz waves, [16] suggests that this method has the potential for covering the entire terahertz band; however, the BWO source that we used is limited to relatively low output frequencies ranging from 160 GHz to 260 GHz.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry

Yuan

Kong

et al. 2016

Chinese Phys. B

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A system for measuring terahertz spectrum is proposed based on optical interferometer theory, and is experimentally demonstrated by using a backward-wave oscillator as the terahertz source. A high-resolution, high-precision interferometer is constructed by using a pyroelectric detector and a chopper. The results show that the spectral resolution is better than 1 GHz and the relative error of frequency is less than 3%. The terahertz energy density distribution is calculated by an inverse Fourier transform and tested to verify the feasibility of the interferometric approach. Two kinds of carbon-fiber composites are imaged. The results confirm that the interferometer is useful for transmission imaging of materials with different thickness values.

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Section: Introductionmentioning

confidence: 99%

Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry

Yuan

Kong

et al. 2016

Chinese Phys. B

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“…Consequently, many scientists and engineers have made efforts to solve these two issues in past decades. [1][2][3][4][5][6][7] For THz generation, thanks to the advent of ultrashort laser pulse with millijoule energy, single-cycle electromagnetic radiation covering THz gap (0.1 THz-10 THz) with MV/cm electric field amplitude can be generated from laser-induced gas plasma. [8][9][10][11] Generation of THz radiation from gas plasma scheme was first demonstrated by Hamster et al [12,13] One single frequency femtosecond (fs) laser beam is focused in the air to ionize the gas, and conical THz emission can be detected at an angle with respect to the direction of propagation.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation on generating terahertz radiation from gas plasma induced by three-color ultrashort lasers

et al. 2015

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Generation of intense broadband terahertz (THz) waves from gas plasma induced by tri-color ultrashort (fundamental (ω), second harmonic (2ω), and third harmonic (3ω)) laser pulses is theoretically investigated. Simulation results show that the 3ω laser pulse can greatly enhance or suppress the generation of THz wave at different values of relative phase (θ 3) between the 3ω and ω fields. Moreover, the polarities of the generated THz waves can be controlled by changing θ 3, with the relative phase θ 2 (between the 2ω and ω fields) fixed to be a certain value. All of our results show that θ 3 plays a key role in the generation process, which promises to control the intensity as well as the polarity of gas plasma-induced THz radiation.

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Study on the generation of terahertz waves in collision plasma

Bao,

He,

et al. 2024

Physics of Plasmas

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Terahertz communication technology holds promise for solving the challenging “blackout” problem. Research has revealed that the spectrum exhibits new peaks when terahertz waves propagate through plasma. In the realm of communications, elucidating the underlying physical mechanisms responsible for these novel peaks is of paramount importance. In this paper, a combination of theoretical analysis and simulation is utilized to investigate the causes of these spectral changes. Theoretically, the expression for the relative dielectric constant of plasma has been refined by incorporating collision terms. Drawing on radiation theory, a particle whose motion is interrupted by collisions can be considered equivalent to a damped harmonic oscillator. Thus, the frequency expression of the new peak was derived. Furthermore, the simulation involved the interaction of a terahertz wave, which had a frequency of 1 THz and lasted for 2 ps, and plasma characterized by a central electron density of 1021 m−3 and a collision frequency of 0.114 THz. The simulation results are consistent with the frequency expression of the new peak. In sum, this study found that collisions between electrons and neutral particles within plasma cause a shift in the frequency of terahertz waves, and has derived the frequency expression. This plasma model can be used to estimate the frequency range of terahertz waves that are generated as they propagate through collisional plasmas.

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Power dependence of terahertz carrier frequency in a plasma-based two-color generation process

Cited by 4 publications

References 18 publications

Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry

Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry

Theoretical investigation on generating terahertz radiation from gas plasma induced by three-color ultrashort lasers

Study on the generation of terahertz waves in collision plasma

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