24 September 2013 Spatial properties of a terahertz beam generated from a two-color air plasma
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We present a spatial characterization of terahertz (THz) beams generated from a two-color air plasma under different conditions by measuring full 3D beam profiles using a commercial THz camera. We compare two THz beam profiles emitted from plasmas generated by 35 fs and 100 fs laser pulses, and show that the spatial properties of the two THz beams do not change significantly. For the THz beam profile generated by the 35 fs pulse, the spatial effect of eliminating the lower frequencies is investigated by implementing two crossed polarizers working as a high-pass filter. We show that this reduces the beam waist, and that the beam spot shape changes from Lorentzian to Gaussian. Finally, we observe a forward-propagating Gaussian THz beam by spatially filtering away the conical off-axis radiation with a 1 cm aperture.
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Pernille Klarskov, Tianwu Wang, Jonas D. Buron, Andrew C. Strikwerda, Peter U. Jepsen, "Spatial properties of a terahertz beam generated from a two-color air plasma", Proc. SPIE 8846, Terahertz Emitters, Receivers, and Applications IV, 88460R (24 September 2013); doi: 10.1117/12.2023821; https://doi.org/10.1117/12.2023821

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