RefractiveIndex.INFO Refractive index database

Shelf

Book

Page

Optical constants of BK7
J-BK7A (HIKARI)

Wavelength: µm
 (0.280 – 2.400)  
 

Other optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.27110883-0.00938988354λ^{2}-0.000100277081λ^{4}+0.0109572221λ^{-2}+0.000120210067λ^{-4}+3.31079774\text{×}10^{-06}λ^{-6}-1.48235581\text{×}10^{-08}λ^{-8}$$

Data

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

Additional information

n_is_absolute: false
λ_is_vacuum: false
temperature: 23.0 °C
n_d: 1.516800
V_d: 64.129950
density: 2.51 g/cm3
coefficient_of_thermal_expansion_1: 7.4e-06 K-1
ΔP_gF: -0.001
phosphate_resistance: 1.0

References

1) HIKARI optical glass catalog 2015-04-01
2) HIKARI Zemax catalog

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