Fig. 1. Scheme of the experimental setup utilized for the optical characterization of nonlinear photonic crystals.

Fig. 2. (a) Spectrum of the signal (851 nm) and idler (1418 nm) measured at 110 °C. (b) OPG map from 40 °C to 200 °C generated from 1D-PPLT of Λ = 8.29 μm at 15 μJ.

Fig. 3. Signal wavelengths vs. temperature for 1D-PPLT of (a) Λ = 8.52 μm and (b) Λ = 12 μm.

Fig. 4. Theoretical (red line) and experimental Signal wavelengths (squares) as a function of the temperature for 1D-PPLT Λ = 8.08 μm, 8.29 μm, 8.43 μm, 8.52 μm and 12 μm.

Fig. 5. The period error at T = 110 °C.

Fig. 6. Comparison of the extraordinary refractive index dispersion n_e as a function of wavelength obtained using the previous Sellmeier equations and the new proposed equation. (a) T = 25 °C and (b) T = 200 °C. The zooms represent the difference of refractive index values obtained with the new equation and the previous ones.