Refractive index database

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Optical constants of ZnGeP2 (Zinc germanium phosphide, ZGP)
Boyd et al. 1971: n(e) 0.64–12 µm; 20 °C

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



Extrardinary ray (e); 20 °C


1) G. D. Boyd, E. Buehler, F. G Storz. Linear and nonlinear optical properties of ZnGeP2 and CdSe, Appl. Phys. Lett., 18, 301-304 (1971)
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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Zinc germanium phosphide, ZnGeP2 (ZGP)

Zinc germanium phosphide (ZnGeP2, ZGP), is a non-linear optical material that has been widely used for frequency conversion in the mid-infrared range. It possesses a broad transparency range, high damage threshold, and phase-matching capabilities, making it a favored choice for a variety of laser applications. Owing to its ability to efficiently generate coherent radiation in the 2 to 12 µm spectral range, ZGP is especially relevant for molecular spectroscopy, environmental monitoring, and medical surgery. As a non-centrosymmetric crystal, ZGP can be employed for second harmonic generation, parametric oscillation, and other non-linear processes when exposed to suitable pump sources.

Other name

  • Zinc germanium diphosphide

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