Fig. 1. Schematic diagram of cross-pumping with pump light total reflection

Fig. 2. Conservation of wave vectors for cross-pumped SPS

Fig. 3. Gain efficiency versus phase mismatch Δk

Fig. 4. Schematic diagram of the experimental structure of cross-pumping SPS

Fig. 5. Output Stokes spectra of SPS under different pump conditions

Fig. 6. The linewidth of Stokes light output by cross-pumped SPS

Fig. 7. Spectral composition of cross-pump SPS at Stokes light and residual pump light

Fig. 8. Angle tuning characteristics of the cross-pumped SPS

Fig. 9. Tuning output characteristics of Stokes light output from cross-pumped SPS

Fig. 10. Waveform of Stokes light at different pump energies

Fig. 11. Stokes light energy versus pump light energy

Fig. 12. Comparison of THz-wave energy output by cross-pumped SPS with or without resonator