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

Wavelength: µm
 (0.32 – 2.5)  
 

Other optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

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

Data

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

Additional information

n_is_absolute: false
λ_is_vacuum: false
temperature: 20.0 °C
coefficients_of_thermal_dispersion: -2.36e-06 1.15e-08 1.11e-11 3.1e-07 2.78e-10 0.234
n_d: 1.64049
V_d: 60.1
glass_code: 640601.374
glass_status: standard
density: 3.74 g/cm3
coefficient_of_thermal_expansion_1: 6.8e-06 K-1
coefficient_of_thermal_expansion_2: 8.1e-06 K-1
ΔP_gF: -0.0017
climatic_resistance: 4.0
stain_resistance: 2.0
acid_resistance: 53.2
alkali_resistance: 4.3
phosphate_resistance: 4.3

References

1) SCHOTT optical glass data sheets 2015-07-22
2) SCHOTT Zemax catalog 2015-07-22

More info - wiki

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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