14 March 2013 Air-breakdown coherent detection of terahertz using controlled optical bias
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Detection of the electric field induced second harmonic (EFISH) signal has been used in gas plasma for measurement of the symmetry-breaking THz transients. Previously, detection linearity with the THz field was accomplished by either mixing EFISH signal with a second harmonic component of an octave-spanning plasma supercontinuum or by addition of a high voltage DC bias across the plasma. Here we report a new method where controlled injection of the second harmonic signal provides the necessary bias for the coherent signal detection. This is accomplished simply by insertion of the BBO crystal in an optical path. The absence of high intensity or high voltage makes the detection scheme more viable for remote sensing.
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Chia-Yeh Li, Chia-Yeh Li, Denis V. Seletskiy, Denis V. Seletskiy, Mansoor Sheik-Bahae, Mansoor Sheik-Bahae, "Air-breakdown coherent detection of terahertz using controlled optical bias", Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 86231V (14 March 2013); doi: 10.1117/12.2003590; https://doi.org/10.1117/12.2003590

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