Fig. 1. Logic diagram of fiber-type THz-TDS

Fig. 2. Schematic diagram of fiber-type THz-TDS

Fig. 3. Autocorrelation curve after femtosecond pulse passing through different lengths of PMF

Fig. 4. Autocorrelation curve after femtosecond pulse passing through DCF and PMF

Fig. 5. The terahertz signal when the angle of the polarization direction of the pump laser or the detect laser between PMF’s fast axis or slow axis are 45°
(a): The terahertz time-domain waveforms;(b): Frequency-domain spectrum

Fig. 6. The terahertz signal when the polarization direction of the pump laser and the polarization direction of the detect laser are parallel to the PMF’s fast or slow axis
(a): The terahertz time-domain waveforms;(b): Frequency-domain spectrum

Fig. 7. Photo of variable angle measurement optical path