# RefractiveIndex.INFO

## Optical constants of GaP (Gallium phosphide)

From RefrectiveIndex.INFO - Refractive index database

Optical constants of GaP (Gallium phosphide)
 Option: Handbook of Optics (n; 0.8-10µm) Aspnes and Studna 1983 (n,k; 0.21-0.83µm) SOPRA N&K Database SOPRA N&K Database: Orientation 100 Wavelength: µm  (0.8~10)
Refractive index

Refractive index - Wikipedia

 n = 3.16052 Chromatic dispersion Dispersion (optics) - Wikipedia dn/dλ = -0.383 µm-1
Dispersion formula

Sellmeier equation - Wikipedia

$$n^2 - 1 = \frac{1.390 λ^2}{λ^2-0.172^2} + \frac{4.131 λ^2}{λ^2-0.234^2} + \frac{2.570 λ^2}{λ^2-0.345^2} + \frac{2.056 λ^2}{λ^2-27.52^2}$$

Expressions for n

References

- Handbook of Optics, 2nd edition, Vol. 2. McGraw-Hill 1994

- Handbook of Optics, 3rd edition contains newer formula with extended range (0.2~22 µm). This formula, however, gives inadequate results at low wavelengths. Original publication cited by the Handbook contains the same formula and range

Reflection calculator
Angle of incidence (0~90°):
Direction: in out
 Reflectance (at 0.8521 µm) Fresnel equations - Wikipedia RS = ... (S-polarized) RP = ... (P-polarized) R = ... (non-polarized, (RS+RP)/2 ) Reflection phase ɸ = ...° ɸS = ...° ɸP = ...° Brewster's angle Brewster's angle - Wikipedia θB = ...° Critical angle Total internal reflection - Wikipedia θC = ...°