Temperature phase-matching tuning of nonlinear ZnGeP2 crystal for frequency conversion under noncritical spectral phase-matching

Crystal ZnGeP2 for Nonlinear Frequency Conversion: Physical Parameters, Phase-Matching and Nonlinear Properties: Revision

“…The Sellmeier equations obtained on the basis of data from [22] were published in [34]. From 1976 to 2023, the Sellmeier equations for ZGP at various temperatures are given in 17 articles [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. The dependences of n i (λ) on the data from these studies at room temperature, obtained using [24], are shown in Figure 3 (the dotted lines show the boundaries of applicability for the equation).…”

“…In most cases, the Sellmeier equations are given independently for refractive indices at room temperature n i (λ) [34,35,[37][38][39][40][41][42][43][44]46,48,50] and for expressions for first-order derivatives dn i (λ)/dT [35,36,43,63], depending on the wavelength. In recent years, the Sellmeier equations have been given with temperature-dependent coefficients [36,47,49,50].…”