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Optical constants of BK7
S-BSL7 (OHARA)

Wavelength: µm
 (0.29 – 2.4)  
 

Other optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

$$n^2-1=\frac{1.1515019λ^2}{λ^2-0.010598413}+\frac{0.118583612λ^2}{λ^2+0.011822519}+\frac{1.26301359λ^2}{λ^2-129.617662}$$

Comments

Recommended

Data

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

Additional information

n_is_absolute: false
λ_is_vacuum: false
temperature: 25.0 °C
coefficients_of_thermal_dispersion: 1.7e-06 1.43e-08 -4.27e-11 4.08e-07 6.74e-10 0.201
n_d: 1.516330
V_d: 64.142022
glass_code: 516641
glass_status: standard
density: 2.52 g/cm3
coefficient_of_thermal_expansion_1: 7.2e-06 K-1
coefficient_of_thermal_expansion_2: 8.6e-06 K-1
ΔP_gF: -0.0024
climatic_resistance: 1.0
acid_resistance: 1.0
phosphate_resistance: 2.0

References

1) OHARA optical glass datasheets 2015-12-01
2) OHARA Zemax catalog 2015-12-01

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

External links