RefractiveIndex.INFO

Refractive index database


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Optical constants of GLASS
BK7 optical glass (crown)

Wavelength: µm
 (0.3 – 2.5)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

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

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 1.86e-06 1.31e-08 -1.37e-11 4.34e-07 6.27e-10 0.17
nd: 1.5168
Vd: 64.17
glass_code: 517642.251
glass_status: standard
density: 2.51 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 7.1e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8.3e-06 K-1
dPgF: -0.0009
climatic_resistance: 1.0
stain_resistance: 0.0
acid_resistance: 1.0
alkali_resistance: 2.3
phosphate_resistance: 2.3

Comments

step 0.5 available

References

SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com)
See also SCHOTT glass data sheets

Data

[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]

INFO

BK7 optical glass

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 J-BK7A
CDGM H-K9L
HOYA BSC7
SUMITA K-BK7
LZOS K8

External links


Glass

External links