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Optical constants of HIKARI - LaK (Lanthanum crown)
J-LAK18

Wavelength: µm
 (0.290 – 2.400)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.93263885-0.0142564324λ^{2}-0.000192506617λ^{4}+0.0206017616λ^{-2}+0.000293008969λ^{-4}+6.61918495\text{×}10^{-06}λ^{-6}+7.33494598\text{×}10^{-08}λ^{-8}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 23.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 2.411e-06 1.1591e-08 -1.5325e-12 5.5519e-07 3.2417e-10 0.13983
nd: 1.729160
Vd: 54.611531
density: 4.17 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 5.6e-06 K-1
dPgF: -0.0085
phosphate_resistance: 3.0

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.

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