Observation of terahertz radiation via the two-color laser scheme with uncommon frequency ratios

Liang-Liang Zhang, Wei-M. Wang, Tong Wu, Rui Zhang, Shi-J. Zhang, Cun-Lin Zhang, Yan Zhang, Zheng-Ming Sheng, Xi-Cheng Zhang

Research output: Contribution to journalLetter

24 Citations (Scopus)

Abstract

In the widely-studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at w2/w1=1:2. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios of w2/w1=1:4 and 2:3. We observe that the THz polarization can be adjusted by rotating the longer-wavelength laser polarization and the polarization adjustment becomes inefficient by rotating the other laser polarization; the THz energy shows similar scaling laws with different frequency ratios. These observations are inconsistent with multi-wave mixing theory, but support the gas-ionization model. This study pushes the development of the two-color scheme and provides a new dimension to explore the long-standing problem of the THz generation mechanism.
LanguageEnglish
Article number235001
Number of pages6
JournalPhysical Review Letters
Volume119
Issue number23
DOIs
Publication statusPublished - 8 Dec 2017

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color
polarization
radiation
lasers
gas ionization
scaling laws
adjusting
gases
wavelengths
energy

Keywords

  • THZ radiation
  • lasers
  • polarization

Cite this

Zhang, L-L., Wang, W-M., Wu, T., Zhang, R., Zhang, S-J., Zhang, C-L., ... Zhang, X-C. (2017). Observation of terahertz radiation via the two-color laser scheme with uncommon frequency ratios. Physical Review Letters, 119(23), [235001]. https://doi.org/10.1103/PhysRevLett.119.235001
Zhang, Liang-Liang ; Wang, Wei-M. ; Wu, Tong ; Zhang, Rui ; Zhang, Shi-J. ; Zhang, Cun-Lin ; Zhang, Yan ; Sheng, Zheng-Ming ; Zhang, Xi-Cheng. / Observation of terahertz radiation via the two-color laser scheme with uncommon frequency ratios. In: Physical Review Letters. 2017 ; Vol. 119, No. 23.
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abstract = "In the widely-studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at w2/w1=1:2. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios of w2/w1=1:4 and 2:3. We observe that the THz polarization can be adjusted by rotating the longer-wavelength laser polarization and the polarization adjustment becomes inefficient by rotating the other laser polarization; the THz energy shows similar scaling laws with different frequency ratios. These observations are inconsistent with multi-wave mixing theory, but support the gas-ionization model. This study pushes the development of the two-color scheme and provides a new dimension to explore the long-standing problem of the THz generation mechanism.",
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Zhang, L-L, Wang, W-M, Wu, T, Zhang, R, Zhang, S-J, Zhang, C-L, Zhang, Y, Sheng, Z-M & Zhang, X-C 2017, 'Observation of terahertz radiation via the two-color laser scheme with uncommon frequency ratios' Physical Review Letters, vol. 119, no. 23, 235001. https://doi.org/10.1103/PhysRevLett.119.235001

Observation of terahertz radiation via the two-color laser scheme with uncommon frequency ratios. / Zhang, Liang-Liang; Wang, Wei-M.; Wu, Tong; Zhang, Rui; Zhang, Shi-J.; Zhang, Cun-Lin; Zhang, Yan; Sheng, Zheng-Ming; Zhang, Xi-Cheng.

In: Physical Review Letters, Vol. 119, No. 23, 235001, 08.12.2017.

Research output: Contribution to journalLetter

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AU - Zhang, Liang-Liang

AU - Wang, Wei-M.

AU - Wu, Tong

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AU - Zhang, Shi-J.

AU - Zhang, Cun-Lin

AU - Zhang, Yan

AU - Sheng, Zheng-Ming

AU - Zhang, Xi-Cheng

PY - 2017/12/8

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AB - In the widely-studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at w2/w1=1:2. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios of w2/w1=1:4 and 2:3. We observe that the THz polarization can be adjusted by rotating the longer-wavelength laser polarization and the polarization adjustment becomes inefficient by rotating the other laser polarization; the THz energy shows similar scaling laws with different frequency ratios. These observations are inconsistent with multi-wave mixing theory, but support the gas-ionization model. This study pushes the development of the two-color scheme and provides a new dimension to explore the long-standing problem of the THz generation mechanism.

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