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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 11,
  • Issue 12,
  • pp. 123002-123002
  • (2013)

Terahertz emission by balanced nonlinear effects in air plasma

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Abstract

The evolution of terahertz (THz) waveform in air plasma driven by low-energy few-cycle laser pulses is investigated to improve the accuracy of the carrier envelope phase (CEP) determination. Based on the transient photocurrent model, a balanced spatial distribution of the Kerr and free-electron effects in the plasma is found at 109 \mu J input energy. THz inversion occurs only once at the initial CEP of 0.5\pi, in which high-precision measurement of the CEP of few-cycle laser pulses is achieved.

© 2013 Chinese Optics Letters

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