Fig. 1. Schematic diagram of each wave vector under 90° ooe vector matching

Fig. 2. Angle relation between the output third harmonic light and the incident light

Fig. 3. Angle relation between incident lights

Fig. 4. Angle relation between input light and output light

Fig. 5. Verification experiment result of third-order correlation signal acquisition

Fig. 6. Relationship between effective nonlinear coefficient and incident angle of second harmonic light (a) d=4 mm, (b) d=1 mm, (c) d=0.5 mm