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Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK9

Wavelength: µm
 (0.310 – 2.000)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.8065086-0.012084694λ^{2}+0.018509723λ^{-2}+0.00045689652λ^{-4}-1.5275984\text{×}10^{-05}λ^{-6}+1.0018509\text{×}10^{-06}λ^{-8}$$

Conditions & Spec sheet

n_absolute: false
λ_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: -3.41e-06 2.03e-08 -1.26e-10 4.75e-07 9.33e-11 0.17
n_d: 1.69100
V_d: 54.8
glass_code: 691548
density: 4.06 g/cm3
  - temperature_range: 20 300 °C
    coefficient: 8.6e-06 K-1
ΔP_gF: -0.004
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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