Experimental setups for measurements of the electric field strength (a) and spot energy density distribution (b).
Transmitted probe beam intensity measured as a function of the QWP angle. The solid line is a fit to .
Spectra of the probe laser with and without the terahertz pulse. The QWP is set at 45° (circularly polarized probe beam).
measured as a function of time, where is arbitrary.
Terahertz focal spot.
Horizontal (a) and vertical (b) line-outs of the terahertz focal spot energy density.
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