Abstract
Optical imaging of spatial distribution of intensity in the focal spot of the terahertz pulse was developed. The technique is based on the THz electric field-induced second harmonic generation in the nonlinear centrosymmetric crystal (SrTiO3). The measurements of the spatial distribution of focal spot of terahertz radiation with the electric field strength over 1 MV/cm were conducted.
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Funding
The experiments were conducted using unique facility “Terawatt Femtosecond Laser Complex” in the Center for Collective Usage “Femtosecond Laser Complex” JIHT RAS and supported by the Russian Science Foundation, project no. 17-19-01261.
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Chefonov, O.V., Ovchinnikov, A.V., Sitnikov, D.S. et al. Focal Spot Imaging of Terahertz Subpicosecond Pulse by THz-Field-Induced Optical Second Harmonic Generation. High Temp 57, 137–139 (2019). https://doi.org/10.1134/S0018151X19010036
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DOI: https://doi.org/10.1134/S0018151X19010036