Refractive index database

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Optical constants of CdGa2S4 (Cadmium gallium sulfide)
Kato et al. 2017: n(e) 0.490–7.52 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



Room temperature. Extraordinary ray (e).


K. Kato, N. Umemura, V. Petrov. Sellmeier and thermo-optic dispersion formulas for CdGa2S4 and their application to the nonlinear optics of Hg1−xCdxGa2S4, Opt. Commun. 386, 49-52 (2017)


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Cadmium gallium sulfide, CdGa2S4

Cadmium gallium sulfide (CdGa2S4) is an inorganic ternary compound that belongs to the family of chalcopyrite semiconductors. It commonly crystallizes in a tetragonal structure and is of interest for its optoelectronic and nonlinear optical properties. Due to its large bandgap and high nonlinear optical coefficients, CdGa2S4 is particularly suitable for frequency conversion applications in lasers, serving as a second- or third-harmonic generation material. Additionally, its capability to absorb and emit in the visible and near-infrared range makes it a potential material for photodetectors, photovoltaic cells, and light-emitting diodes. The compound is typically synthesized using techniques like solid-state reactions, chemical vapor deposition, or hydrothermal methods, allowing for control over its crystal quality and stoichiometry. Despite its promising properties, the presence of toxic cadmium necessitates careful handling and environmental considerations. Overall, CdGa2S4 offers a compelling array of attributes for optical and optoelectronic applications and continues to be a subject of active research.

Other names

  • Cadmium thiogallate
  • Cadmium gallium sulphide