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Schematic of the phase compensator incorporated with a wedge pair: DM used to separate or recombine and beams; HWP used to control the polarization of the beam.
(a) Phase scan obtained by continuously changing the insertion of the fused silica wedge pair while keeping the delay line for the terahertz waveform at the peak terahertz electric field. The inset shows a zoomed-in portion of the phase scan, indicating the precise control over the relative phase between and pulses. (b) Two terahertz waveforms with opposite polarities due to phase shift induced by changing the relative insertion of the wedge pair in the phase compensator.
Phase scan at different distances obtained by continuously changing the insertion of the fused silica wedge pair while monitoring the terahertz average power with a pyroelectric detector. The optical beams ( and ) are focused locally by a parabolic mirror with a focal length of 8 in. after traveling in the air at different distances.
Terahertz waveforms and spectra (insets) generated by sending optical beams at distances of (a) 42 m and (b) 116 m, respectively, and focusing them locally using a parabolic mirror with an effective focal length of 8 in. The peak signal/noise ratio of the spectrum is greater than 100 with a TC of 100 ms.
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