## Optical constants of CdGeP_{2} (Cadmium germanium phosphide)

Boyd et al. 1972: n(o) 0.8–12.5 µm; 20 °C

Wavelength:
µm

(0.8–12.5)

### Complex refractive index (*n+ik)*

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=4.9677+\frac{4.2286λ^2}{λ^2-0.2021}+\frac{1.6351λ^2}{λ^2-671.33}$$### Comments

Ordinary ray (o); 20 °C

### References

1) G. D. Boyd, E. Buehler, F. G Storz, J. H. Wernick. Linear and nonlinear optical properties of ternary A^{II}B^{IV}C_{2}^{V} 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

### Data

## INFO

### Cadmium germanium phosphide, CdGeP_{2}

Cadmium germanium phosphide (CdGeP_{2}) 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. CdGeP

_{2}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 CdGeP

_{2}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, CdGeP

_{2}remains an attractive material for advanced nonlinear optical applications and continues to be the subject of ongoing research.