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Optical constants of SCHOTT - LaK (Lanthanum crown)
P-LAK35

Wavelength: µm
 (0.3–2.5)  
 

Complex refractive index (n+ik)[ i ]


n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]

$$n^2-1=\frac{1.3932426λ^2}{λ^2-0.00715959695}+\frac{0.418882766λ^2}{λ^2-0.0233637446}+\frac{1.043807λ^2}{λ^2-88.3284426}$$

Conditions & Spec sheet

n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: -1.9e-06 7.99e-09 7.76e-12 5.64e-07 6.57e-10 0.185
nd: 1.6935
Vd: 53.2
glass_code: 693532.385
glass_status: standard
density: 3.848 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 8.13e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 9.68e-06 K-1
dPgF: -0.0061
climatic_resistance: 2.0
stain_resistance: 5.0
acid_resistance: 53.3
alkali_resistance: 1.3
phosphate_resistance: 4.3

Comments

suitable for precision molding

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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