Role of resonance absorption in terahertz radiation generation from solid targets

Li, Chun; Cui, Yun-Qian; Zhou, Mu-Lin; Du, Fei; Li, Yutong; Wang, Weimin; Chen, Liming; Sheng, Zheng-Ming; Ma, Jing; Lü, Xingqiang; Zhang, Jie

doi:10.1364/oe.22.011797

Cited by 21 publications

(17 citation statements)

References 30 publications

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“…All these properties agree with CTR depicted above. By using lasers with different polarizations and contrast ratios, Li et al 6,32,33 revealed the significance of hot electrons, especially the role of resonance absorption, to the generation of THz radiation.…”

Section: E Comparison With Some Experimental Observationsmentioning

confidence: 99%

Sub GV/cm terahertz radiation from relativistic laser-solid interactions via coherent transition radiation

Ding

Sheng

2016

Phys. Rev. E

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Broadband terahertz (THz) radiation with extremely high peak power, generated by the interaction of a femtosecond laser with a thin solid target, has been investigated via particle-in-cell simulations. The spatial (angular) and temporal profiles of the THz radiation reveal that it is caused by the coherent transition radiation emitted when laser-produced hot electrons pass through the front or rear surface of the target. Dependence of the THz radiation on laser and target parameters is studied; it is shown to have a strong correlation with hot electron production. The THz radiation conversion efficiency can be as high as a few times 10^{-3}. This radiation is not only a potentially high power THz source, but may also be used as a unique diagnostic of hot electron generation and transport in relativistic laser-solid interactions.

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Section: E Comparison With Some Experimental Observationsmentioning

confidence: 99%

Sub GV/cm terahertz radiation from relativistic laser-solid interactions via coherent transition radiation

Ding

Sheng

2016

Phys. Rev. E

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“…Unlike terahertz emission from the target front surface where the NIR laser pulse interacts with the solid foil, the generation of coherent terahertz radiation from the rear surface is different. In the case of emission from the target front surface, there are a multitude of physical processes responsible for terahertz generation from the laser-plasma interaction region [23][24][25][26][27][28] which are directly dependent on the incident laser parameters (polarization, ASE contrast, pulse duration, intensity) and target material etc. However, in the case of emission from the rear surface [7,8,[29][30][31][32][33][34] the THz dynamics has to depend on the hot electrons which are generated at the front surface during the interaction of laser pulse with the foil and gain energy and accelerated back to the target ballistically, travel through the target and exit the rear surface.…”

Section: Thz Generation At the Target Rear Surfacementioning

confidence: 99%

An investigation on THz yield from laser-produced solid density plasmas at relativistic laser intensities

et al. 2018

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We experimentally characterize the generation of high-power terahertz radiation (THz) at the rear surface of a target irradiated by multiple laser pulses. A detailed dependence of the THz yield as a function of laser pulse duration, energy, target material and thickness is presented. We studied the THz radiation emitted mainly in two directions from the target rear surface, namely target normal (acceptance angle 0.87 sr) and non-collinear direction (perpendicular to the target normal directionacceptance angle 4.12 sr). Independent measurements based on electro-optic diagnostics and pyroelectric detector were employed to estimate the THz yield. Most of the energy is emitted at large angles relative to the target normal direction. THz yield increases with incident laser intensity and thinner targets are better emitters of THz radiation compared to thicker ones.

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“…In experiments we have also measured the spectra of scattered laser light. The THz radiation near the target surface is found to be correlated with the second harmonics of the laser pulse [40,42], while the radiation near the target normal shows positive correlation with three-halves harmonics [38].…”

Section: Target Surface Transient Currentmentioning

confidence: 99%

Intense terahertz radiation from relativistic laser–plasma interactions

Liao¹,

Li²,

Li³

et al. 2016

Plasma Phys. Control. Fusion

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The development of tabletop intense terahertz (THz) radiation sources is significantly important for THz science and applications. This paper presents our measurements of intense THz radiation from relativistic laser-plasma interactions under different experimental conditions. Several THz generation mechanisms have been proposed and investigated, including coherent transition radiation emitted by fast electrons from the target rear surface, transient current radiation at the front of the target, and mode conversion from electron plasma waves to THz waves. The results indicate that relativistic laser plasma is a promising driver of intense THz radiation sources.

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Role of resonance absorption in terahertz radiation generation from solid targets

Cited by 21 publications

References 30 publications

Sub GV/cm terahertz radiation from relativistic laser-solid interactions via coherent transition radiation

Sub GV/cm terahertz radiation from relativistic laser-solid interactions via coherent transition radiation

An investigation on THz yield from laser-produced solid density plasmas at relativistic laser intensities

Intense terahertz radiation from relativistic laser–plasma interactions

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