Enhancement of terahertz waves from two-color laser-field induced air plasma excited using a third-color femtosecond laser

Optics Express
Danni MaCunlin Zhang

Abstract

This study experimentally demonstrates and theoretically analyzes the enhancement of terahertz (THz) waves from two-color laser-field (consisting of a near-infrared femtosecond laser and its second-harmonic wave) induced air plasma using an additional 800 nm femtosecond laser. The experiments revealed that the additional 800 nm laser increased the THz energy up to 22 times. To understand the enhancement mechanism and reveal the maximum enhancement conditions, the effects of the 800 nm beam's polarization and energy variations of both beams on the THz amplification were studied. With the increase in the 800 nm pulse energy, the THz yield initially increases, and then decreases after reaching an inflection point. The THz increase rate continues to increase with the decrease in energy of the near-infrared two-color fields. The 800 nm beam could efficiently modulate the THz spectral energy distribution by increasing the high-frequency components, while decreasing the low-frequency components.

References

Apr 12, 2006·Physical Review Letters·Xu XieX-C Zhang
Dec 11, 2007·Optics Letters·D J Cook, R M Hochstrasser
Apr 16, 2007·Optics Express·Ki-Yong KimGeorge Rodriguez
Jun 16, 2010·Optics Letters·Poul B Petersen, Andrei Tokmakoff
May 23, 2015·Physical Review Letters·P González de Alaiza MartínezJ Herrmann
Dec 30, 2017·Physical Review Letters·Liang-Liang ZhangXi-Cheng Zhang

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