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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 17 — Aug. 13, 2012
  • pp: 19264–19270

Theoretical research on terahertz air-breakdown coherent detection with the transient photocurrent model

Hu Wang, Kejia Wang, Jinsong Liu, Houmei Dai, and Zhengang Yang  »View Author Affiliations


Optics Express, Vol. 20, Issue 17, pp. 19264-19270 (2012)
http://dx.doi.org/10.1364/OE.20.019264


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Abstract

The physical mechanism for sensing broadband terahertz (THz) wave via using femtosecond (fs) laser induced gas plasma without any local accessory near the plasma, i.e. THz air breakdown coherent detection, is systemically investigated by utilizing the transient photocurrent model. Previous observed results, such as conversion from incoherent to coherent detection, can be numerically obtained. Further calculations and analysis show that it is through modification of the gas ionization process, and not acceleration of freed electrons or through a four-wave-mixing (FWM) process, that the THz waveforms can be encoded into the detected second harmonic (SH) signals.

© 2012 OSA

OCIS Codes
(260.5210) Physical optics : Photoionization
(350.5400) Other areas of optics : Plasmas
(040.2235) Detectors : Far infrared or terahertz
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Ultrafast Optics

History
Original Manuscript: May 25, 2012
Revised Manuscript: August 1, 2012
Manuscript Accepted: August 3, 2012
Published: August 8, 2012

Citation
Hu Wang, Kejia Wang, Jinsong Liu, Houmei Dai, and Zhengang Yang, "Theoretical research on terahertz air-breakdown coherent detection with the transient photocurrent model," Opt. Express 20, 19264-19270 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-17-19264


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