Abstract
The propagation of few-cycle THz pulses are measured by the improved CCD based 2D THz imaging system. There exists strong spatio-temporal shaping effect, leading to dramatically time dependent beam diameter and wave front. Theoretical simulation is given.
Highlights
The propagation and diffraction of few-cycle, even sub-cycle THz pulses have attracted much attention recently both theoretically and experimentally
The pump pulse, the timing of which can be controlled by a mechanic delay line, illuminates a THz emitter to generate few-cycle THz pulse
The THz pulse is focused onto an electro-optic (EO) crystal by either parabolic mirrors or a polyethylene lens
Summary
The propagation and diffraction of few-cycle, even sub-cycle THz pulses have attracted much attention recently both theoretically and experimentally. THz pulse is a good candidate to study the propagation and diffraction effects. Because both the generation and detection of few-cycle, or even sub-cycle THz pulses are mature. The detection techniques of the THz electric field are mature, most available techniques are based on single point measurement, i.e. spatially only one point is measured at one time. If an image of 2D distribution is needed, it is necessary to scan the detecting system. This scanning involves mechanic movement, and is very time consuming and not in real-time. The lack of adequate experimental measurement prevents one from getting deep insight into the complicated propagation of few-cycle pulses
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