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Optical constants of BK7

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Optical constants of BK7
Option:
Wavelength: µm  (0.3~2.5)
Refractive index

Refractive index - Wikipedia

n = 1.5168

Chromatic dispersion

Dispersion (optics) - Wikipedia

dn/dλ = -0.0418 µm-1

Abbe numbers

Abbe number - Wikipedia

Vd = 64.17

Ve = 63.96

Formulae    Abbe diagram

[ Figure: Refractive index of BK7 ]
Dispersion formula

Sellmeier equation - Wikipedia

$$ n^2 - 1 = \frac{1.03961212 λ^2}{λ^2-0.00600069867} + \frac{0.231792344 λ^2}{λ^2-0.0200179144} + \frac{1.01046945 λ^2}{λ^2-103.560653} $$

C

n = sqrt( 1 + 1.03961212*pow(x,2)/(pow(x,2)-0.00600069867) + 0.231792344*pow(x,2)/(pow(x,2)-0.0200179144) + 1.01046945*pow(x,2)/(pow(x,2)-103.560653) )

Fortran

n = SQRT( 1 + 1.03961212*x**2/(x**2-0.00600069867) + 0.231792344*x**2/(x**2-0.0200179144) + 1.01046945*x**2/(x**2-103.560653) )

Visual Basic

n = SQRT( 1 + 1.03961212*x**2/(x**2-0.00600069867) + 0.231792344*x**2/(x**2-0.0200179144) + 1.01046945*x**2/(x**2-103.560653) )

Expressions for n

References

- SCHOTT Optical Glass Data Sheet-Catalog [link]

Reflection calculator
Angle of incidence (0~90°): 
Direction: in out
Reflectance (at 0.5876 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 )

BK7 is a very popular crown glass. Most glass makers produce this glass under slightly different names.

Analogs of BK7 glass produced by different makers

Maker Glass
SCHOTT N-BK7
OHARA S-BSL7
HIKARI E-BK7
CDGM H-K9L
HOYA BSC7
SUMITA K-BK7
LZOS K8

External links

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