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Optical constants of SUMITA - LaFK
K-LaFK50T(M)

Wavelength: µm
 (0.300 – 2.000)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=3.0365333-0.012640924λ^{2}+0.023542665λ^{-2}+0.00054022154λ^{-4}+3.5952261\text{×}10^{-06}λ^{-6}-3.549746\text{×}10^{-07}λ^{-8}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 2.67e-06 1.57e-08 -3.04e-10 6.28e-07 3.17e-10 0.192
nd: 1.76209
Vd: 49.6
glass_code: 766498
density: 4.75 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 6.3e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8.1e-06 K-1
dPgF: -0.0068
climatic_resistance: 1.0
acid_resistance: 3.0

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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