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Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK10

Wavelength: µm
 (0.310 – 2.000)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.8960747-0.011713123λ^{2}+0.021599254λ^{-2}+0.00043811038λ^{-4}+5.752903\text{×}10^{-06}λ^{-6}-1.7364157\text{×}10^{-07}λ^{-8}$$

Conditions & Spec sheet

n_is_absolute: false
λ_is_vacuum: false
temperature: 20.0 °C
coefficients_of_thermal_dispersion: -2.63e-06 2.02e-08 -6.98e-11 5.94e-07 9.57e-10 0.184
n_d: 1.72000
V_d: 50.3
glass_code: 720503
density: 4.08 g/cm3
coefficient_of_thermal_expansion_1: 7.2e-06 K-1
coefficient_of_thermal_expansion_2: 8.6e-06 K-1
ΔP_gF: -0.0066
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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