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Optical constants of SCHOTT - LaK (Lanthanum crown)
N-LAK10

Wavelength: µm
 (0.35 – 2.5)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{1.72878017λ^2}{λ^2-0.00886014635}+\frac{0.169257825λ^2}{λ^2-0.0363416509}+\frac{1.19386956λ^2}{λ^2-82.9009069}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 4.1e-06 1.23e-08 -7.85e-12 5.08e-07 5.76e-10 0.205
nd: 1.72003
Vd: 50.62
glass_code: 720506.369
glass_status: standard
density: 3.689 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 5.68e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 6.83e-06 K-1
dPgF: -0.0072
climatic_resistance: 2.0
stain_resistance: 2.0
acid_resistance: 52.3
alkali_resistance: 1.0
phosphate_resistance: 3.0

Comments

References

SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com)
See also SCHOTT glass data sheets

Data

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

INFO

SCHOTT AG

SCHOTT AG is a German glass manufacturer. SCHOTT also publishes a glass catalog (SCHOTT Optical Glass Datasheets), which is a standard reference for the properties of many optical glasses.

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