Fig. 1. (a) Layout of experimental setup. λ1=800  nm, λ2=1000  nm–1600  nm. (b) Theoretical curves of the wave vector relationship of the interaction wave beams, where the incidences are both set to be ordinary polarized and the SFG extraordinary polarized.

Fig. 2. (a)–(c) Illustrations of the typical patterns with the wavelength of incidence F2 at 1250 nm, 1340 nm, and 1450 nm, respectively. (d)–(f) Schematics of the phase-match conditions of the Cerenkov sum-frequency generation (CSFG) in normal dispersion, degenerated, and anomalous dispersion stage, respectively.

Fig. 3. (a) Experimental data (red spots) and simulation (solid line) of the external angle of the Cerenkov generation as a function of incident wavelength. (b) Experimental data (green spots) and simulation (solid line) of the incident angle at degenerated stage as a function of incident wavelength.

Fig. 4. (a) Experimental pattern of the two sets of multiple conical harmonic generations. (b), (c) Phase-matching geometries for conical SFG 1 and conical SFG 2, respectively. Each incidence mixes with the scattered lights of the other incidence, giving birth to multiple scattering rings with different radii and center locations.