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Optical constants of SCHOTT - LaK (Lanthanum crown)
N-LAK21

Wavelength: µm
 (0.32–2.5)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{1.22718116λ^2}{λ^2-0.00602075682}+\frac{0.420783743λ^2}{λ^2-0.0196862889}+\frac{1.01284843λ^2}{λ^2-88.4370099}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 20.0 ℃
thermal_dispersion:
  - type: "Schott formula"
    coefficients: -2.36e-06 1.15e-08 1.11e-11 3.1e-07 2.78e-10 0.234
nd: 1.64049
Vd: 60.1
glass_code: 640601.374
glass_status: standard
density: 3.74 g/cm3
thermal_expansion:
  - temperature_range: -30 70 ℃
    coefficient: 6.8e-06 K-1
  - temperature_range: 20 300 ℃
    coefficient: 8.1e-06 K-1
dPgF: -0.0017
climatic_resistance: 4.0
stain_resistance: 2.0
acid_resistance: 53.2
alkali_resistance: 4.3
phosphate_resistance: 4.3

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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