Refractive index database

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Optical constants of CdGeP2 (Cadmium germanium phosphide)
Boyd et al. 1972: n(e) 0.8–12.5 µm; 118 °C

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



Extrardinary ray (e); 118 °C


1) G. D. Boyd, E. Buehler, F. G Storz, J. H. Wernick. Linear and nonlinear optical properties of ternary AIIBIVC2V chalcopyrite semiconductors, IEEE J. Quant. Electron., 8, 419-426 (1972)
2) G. C. Bhar and G. Ghosh. Temperature-dependent Sellmeier coefficients and coherence lengths for some chalcopyrite crystals, J. Opt. Soc. Am. 69, 730-733 (1979)
*Ref. 2 provides a dispersion formula based on data from Ref. 1


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Cadmium germanium phosphide, CdGeP2

Cadmium germanium phosphide (CdGeP2) is an inorganic compound that crystallizes in a chalcopyrite-type structure. This material has gained attention for its unique nonlinear optical properties, particularly its phase-matching capabilities and significant nonlinear optical coefficients. CdGeP2 is often used in frequency conversion applications, including second-harmonic generation and parametric oscillation, predominantly in the mid-infrared spectral range. Its large bandgap and good thermal stability make it suitable for high-temperature and high-power applications. However, the presence of toxic cadmium calls for careful handling and may limit its broader use. Synthesis methods for CdGeP2 include Bridgman-Stockbarger and Czochralski techniques, which aim to produce high-quality single crystals for specialized optical applications. Despite the environmental and handling challenges posed by its toxic components, CdGeP2 remains an attractive material for advanced nonlinear optical applications and continues to be the subject of ongoing research.