RefractiveIndex.INFO Refractive index database

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Optical constants of BK7
K-BK7 (SUMITA)

Wavelength: µm
 (0.365 – 1.548)  
 

Other optical constants

logX   logY   eV

Dispersion formula

$$n^2=2.2704549-9.9748327\text{×}10^{-3}λ^{2}+1.0468377\text{×}10^{-2}λ^{-2}+2.797425\text{×}10^{-4}λ^{-4}-2.1706023\text{×}10^{-5}λ^{-6}+1.4265697\text{×}10^{-6}λ^{-8}$$

Comments

Refractive index is relative to air at standard conditions; Wavelength in dispersion formula is as measured in air and expressed in micrometers

Data

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

References

Sumita Optical Glass Data Book

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