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Optical constants of SCHOTT - LaK (Lanthanum crown)
LAKL12

Wavelength: µm
 (0.32–2.5)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{1.28115389λ^2}{λ^2-0.00636439821}+\frac{0.482607607λ^2}{λ^2-0.0213764262}+\frac{1.16553538λ^2}{λ^2-93.2771532}$$

Conditions & Spec sheet

n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 2.26e-06 1.05e-08 -8.4e-12 4.57e-07 5.86e-10 0.21
nd: 1.6779
Vd: 54.92
glass_code: 678549.332
glass_status: preferred
density: 3.32 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 6.8e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8e-06 K-1
dPgF: -0.0062
climatic_resistance: 3.0
stain_resistance: 3.0
acid_resistance: 53.3
alkali_resistance: 2.2
phosphate_resistance: 3.3

Comments

was replaced by N-LAK12

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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