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Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK18

Wavelength: µm
 (0.290 – 2.000)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.9333796-0.014920134λ^{2}+0.020207432λ^{-2}+0.00041238589λ^{-4}-1.230332\text{×}10^{-05}λ^{-6}+1.1436994\text{×}10^{-06}λ^{-8}$$

Conditions & Spec sheet

n_is_absolute: false
λ_is_vacuum: false
temperature: 20.0 °C
coefficients_of_thermal_dispersion: 6.73e-07 2.1e-08 -1.63e-10 4.91e-07 2.14e-10 0.164
n_d: 1.72916
V_d: 54.7
glass_code: 729547
density: 4.08 g/cm3
coefficient_of_thermal_expansion_1: 5.6e-06 K-1
coefficient_of_thermal_expansion_2: 7.1e-06 K-1
ΔP_gF: -0.0092
climatic_resistance: 1.0
acid_resistance: 4.0

References

SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book

Data

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

INFO

SUMITA Optical Glass, Inc.

SUMITA Optical Glass, Inc. is a Japanese glass manufacturer

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