Coherent 2D electro-optic sampling setup using ZnTe detection crystal. (a) Experiment. CH: optical chopper for dynamic subtraction; L1: plano-convex lens (f = 300 mm); CF: ceramic filter; SF: silicon filter; BS: beamsplitter; AN: analyzer; L2: objective lens (f = 50 mm). (b) Left: 2D transverse profile of the THz electric field for a given time delay between the THz and probe pulses (scale: the white bar is 5 mm long); Center: temporal evolution of the THz electric field at the position corresponding to the intersection of the white lines (left image); Right: corresponding amplitude of THz spectrum.