Fig. 1. Photorefractive InP∶Fe two-wave mixing scheme

Fig. 2. Theoretical curves of gain coefficient varying with pump intensity at different temperatures when θ=5° and E₀=5 kV·cm^-1. (a) 290 K; (b) 298 K; (c) 306 K; (d) 314 K

Fig. 3. Theoretical curves of gain coefficient varying with pump intensity under different weak applied electric fields when θ=5° and T=298 K. (a) 0 kV·cm^-1; (b) 0.2 kV·cm^-1; (c) 0.4 kV·cm^-1; (d) 0.6 kV·cm^-1

Fig. 4. Theoretical curves of gain coefficient varying with pump intensity under different applied electric field when θ=5° and T=298 K. (a) 2 kV·cm^-1; (b) 3 kV·cm^-1; (c) 4 kV·cm^-1; (d) 5 kV·cm^-1

Fig. 5. Theoretical curves of gain coefficient varying with applied electric field when θ=5°, T=298 K, and I_p=218 mW·cm^-2

Fig. 6. Theoretical curves of gain coefficient varying with incident angle under different applied electric fields when T=298 K and I_p=218 mW·cm^-2. (a) 2 kV·cm^-1; (b) 4 kV·cm^-1; (c) 5 kV·cm^-1

Fig. 7. Theoretical curves of gain coefficient varying with incident angle under different pump light intensities when T=298 K and E₀=5 kV·cm^-1. (a) 90 mW·cm^-2; (b) 150 mW·cm^-2; (c) 218 mW·cm^-2

Fig. 8. Experimental setup of InP∶Fe two-wave coupling under external electric field

Fig. 9. Variation curves of experimental gain coefficient with pump beam intensity under different applied electric fields when T=298 K and θ=5°. (a) 2.6 kV·cm^-1; (b) 3.8 kV·cm^-1; (c) 5 kV·cm^-1

Fig. 10. Variation curve of experimental gain coefficient with applied electric field when T=298 K, I_p=345 mW·cm^-2, and θ=5°

Fig. 11. Variation curve of experimental gain coefficient with incident angle when T=298 K, I_p= 345 mW·cm^-2, and E₀=5.1 kV·cm^-1