Strong, tunable terahertz emission by two-color picosecond laser irradiation

W.-M. Wang, P. Gibbon, Z.-M. Sheng, Y.-T. Li

Research output: Contribution to journalArticle

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Abstract

It is shown by particle-in-cell simulations that powerful terahertz (THz) radiation can be generated by picosecond (ps) laser pulses below 1014W/cm2 via a two-color laser scheme. At such laser intensities, increasing the laser duration can result in significant enhancement in THz intensities. From 0.03 ps to 0.9 ps the enhancement climbs to nearly 40× before saturating until 2 ps. This demonstrates that low intensity, readily available ps laser technology could be utilized for driving powerful THz sources. By contrast, for laser intensities high enough to completely ionize the gas medium, it is found that the THz emission decreases with increasing pulse duration: optimal conversion is found for few-femtosecond drivers.
Original languageEnglish
Article number023808
Number of pages5
JournalPhysical Review A
Volume90
DOIs
Publication statusPublished - 7 Aug 2014

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color
irradiation
lasers
augmentation
high power lasers
pulse duration
radiation
pulses
cells
gases
simulation

Keywords

  • tunable terahertz emission
  • laser intensities
  • pulse duration

Cite this

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abstract = "It is shown by particle-in-cell simulations that powerful terahertz (THz) radiation can be generated by picosecond (ps) laser pulses below 1014W/cm2 via a two-color laser scheme. At such laser intensities, increasing the laser duration can result in significant enhancement in THz intensities. From 0.03 ps to 0.9 ps the enhancement climbs to nearly 40× before saturating until 2 ps. This demonstrates that low intensity, readily available ps laser technology could be utilized for driving powerful THz sources. By contrast, for laser intensities high enough to completely ionize the gas medium, it is found that the THz emission decreases with increasing pulse duration: optimal conversion is found for few-femtosecond drivers.",
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Strong, tunable terahertz emission by two-color picosecond laser irradiation. / Wang, W.-M.; Gibbon, P. ; Sheng, Z.-M.; Li, Y.-T.

In: Physical Review A, Vol. 90, 023808 , 07.08.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Strong, tunable terahertz emission by two-color picosecond laser irradiation

AU - Wang, W.-M.

AU - Gibbon, P.

AU - Sheng, Z.-M.

AU - Li, Y.-T.

PY - 2014/8/7

Y1 - 2014/8/7

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AB - It is shown by particle-in-cell simulations that powerful terahertz (THz) radiation can be generated by picosecond (ps) laser pulses below 1014W/cm2 via a two-color laser scheme. At such laser intensities, increasing the laser duration can result in significant enhancement in THz intensities. From 0.03 ps to 0.9 ps the enhancement climbs to nearly 40× before saturating until 2 ps. This demonstrates that low intensity, readily available ps laser technology could be utilized for driving powerful THz sources. By contrast, for laser intensities high enough to completely ionize the gas medium, it is found that the THz emission decreases with increasing pulse duration: optimal conversion is found for few-femtosecond drivers.

KW - tunable terahertz emission

KW - laser intensities

KW - pulse duration

U2 - 10.1103/PhysRevA.90.023808

DO - 10.1103/PhysRevA.90.023808

M3 - Article

VL - 90

JO - Physical Review A - Atomic, Molecular, and Optical Physics

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SN - 1050-2947

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