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Optical constants of SCHOTT - LaK (Lanthanum crown)
N-LAK33B

Wavelength: µm
 (0.3 – 2.5)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{1.42288601λ^2}{λ^2-0.00670283452}+\frac{0.593661336λ^2}{λ^2-0.021941621}+\frac{1.1613526λ^2}{λ^2-80.7407701}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 20.0 ℃
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 2.77e-06 1.24e-08 1.22e-11 5.19e-07 6.02e-10 0.184
nd: 1.755
Vd: 52.3
glass_code: 755523.422
glass_status: standard
density: 4.221 g/cm3
thermal_expansion:
  - temperature_range: -30 70 ℃
    coefficient: 5.83e-06 K-1
  - temperature_range: 20 300 ℃
    coefficient: 7.06e-06 K-1
dPgF: -0.0085
climatic_resistance: 1.0
stain_resistance: 1.0
acid_resistance: 51.3
alkali_resistance: 1.0
phosphate_resistance: 2.0

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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