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Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK14

Wavelength: µm
 (0.310 – 2.000)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.8277206-0.013838479λ^{2}+0.0179847λ^{-2}+0.00057777884λ^{-4}-3.7712827\text{×}10^{-05}λ^{-6}+2.2935918\text{×}10^{-06}λ^{-8}$$

Conditions & Spec sheet

n_absolute: false
λ_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: -4.5e-07 1.44e-08 -3.03e-10 5.54e-07 7.23e-10 0.135
n_d: 1.69680
V_d: 55.6
glass_code: 697556
density: 3.64 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 6.4e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8.1e-06 K-1
ΔP_gF: -0.0065
climatic_resistance: 1.0
acid_resistance: 5.0

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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