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Optical constants of BAK1
J-BAK1 (HIKARI)

Wavelength: µm
 (0.290 – 2.400)  
 

Other optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.43258691-0.00822086723λ^{2}-9.21764324\text{×}10^{-05}λ^{4}+0.0143187501λ^{-2}+0.000159799832λ^{-4}+8.58344462\text{×}10^{-06}λ^{-6}-1.00538104\text{×}10^{-07}λ^{-8}$$

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: 1.572500
V_d: 57.291343
density: 3.17 g/cm3
coefficient_of_thermal_expansion_1: 7.3e-06 K-1
ΔP_gF: -0.0011
phosphate_resistance: 2.0

References

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

More info - wiki

BAK1 is a very popular optical glass. Most glass makers produce this or very similar glass.

BAK1 or similar glasses produced by different makers

Maker Glass
Schott N-BAK1
Hikari E-BAK1
Ohara S-BAL11
CDGM H-BAK8