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Optical constants of BK7
J-BK7A (HIKARI)

Wavelength: µm
 (0.280 – 2.400)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

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

Conditions & Spec sheet

n_absolute: false
λ_vacuum: false
temperature: 23.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 8.20811e-07 8.68946e-09 -1.28363e-13 5.04167e-07 5.18196e-10 0.147522
n_d: 1.516800
V_d: 64.129950
density: 2.51 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 7.4e-06 K-1
ΔP_gF: -0.001
phosphate_resistance: 1.0

References

NIKON Zemax catalog 2017-11 (obtained from http://www.nikon.com)
See also HIKARI glass data sheets

Data

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

INFO

Hikari Glass Co., Ltd.

Hikari Glass Co., Ltd. is a Japanese glass maker, a subsidiary of Nikon Corp.

External links


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