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Optical constants of GaP (Gallium phosphide)

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Optical constants of GaP (Gallium phosphide)
Option:
Wavelength: µm  (0.8~10)
Refractive index

Refractive index - Wikipedia

n = 3.16052

Chromatic dispersion

Dispersion (optics) - Wikipedia

dn/dλ = -0.383 µm-1

[ Figure: Refractive index of GaP (Gallium phosphide) ]
Dispersion formula

Sellmeier equation - Wikipedia

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

C

n = sqrt( 1 + 1.390*pow(x,2)/(pow(x,2)-pow(0.172,2)) + 4.131*pow(x,2)/(pow(x,2)-pow(0.234,2)) + 2.570*pow(x,2)/(pow(x,2)-pow(0.345,2)) + 2.056*pow(x,2)/(pow(x,2)-pow(27.52,2)) )

Fortran

n = SQRT( 1 + 1.390*x**2/(x**2-0.172**2) + 4.131*x**2/(x**2-0.234**2) + 2.570*x**2/(x**2-0.345**2) + 2.056*x**2/(x**2-27.52**2) )

Visual Basic

n = SQRT( 1 + 1.390*x**2/(x**2-0.172**2) + 4.131*x**2/(x**2-0.234**2) + 2.570*x**2/(x**2-0.345**2) + 2.056*x**2/(x**2-27.52**2) )

Expressions for n

References

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

Comments

- 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 = ...°

More info ( wiki )

Gallium phosphide, GaP

Other name

Gallium(III) phosphide

External links

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