Fig. 1. FRODL schematic diagram. (a) FRODL two-dimensional simplified model; (b) physical diagram of turntable

Fig. 2. Simulation results of optical path under different rotation angles of FRODL

Fig. 3. Theoretical results of FRODL delay time. (a) Delay time; (b) nonlinear error curve

Fig. 4. Calibration of actual working range of FRODL. (a) FRODL coupling power testing system; (b) proportion of coupling optical power of FRODL relative to normal incident coupling optical power at different rotation angles

Fig. 5. Diagram of polarization Michelson interference system device

Fig. 6. Test results of FRODL. (a) Average delay time of TRS; (b) nonlinear error curves of TRS delay time

Fig. 7. FRODL nonlinear calibration. (a) THz time-domain waveforms before and after typical TRS nonlinear calibration; (b) THz waveform spectrum before and after typical TRS equidistant interpolation