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Optical constants of OHARA - Low Tg glasses for precision molding
L-LAL12

Wavelength: µm
 (0.3 – 2.4)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

$$n^2-1=\frac{1.28516283λ^2}{λ^2-0.00641062082}+\frac{0.478333797λ^2}{λ^2-0.0214815099}+\frac{1.21605301λ^2}{λ^2-100.243378}$$

Conditions & Spec sheet

n_is_absolute: false
λ_is_vacuum: false
temperature: 25.0 °C
coefficients_of_thermal_dispersion: 3.27e-07 8.14e-09 -3.58e-11 5.41e-07 7.88e-10 0.181
n_d: 1.677900
V_d: 54.887440
glass_code: 678549
density: 3.48 g/cm3
coefficient_of_thermal_expansion_1: 7.6e-06 K-1
coefficient_of_thermal_expansion_2: 9e-06 K-1
ΔP_gF: -0.0069
climatic_resistance: 3.0
acid_resistance: 53.2
phosphate_resistance: 4.0

Comments

Low Softening Temperature

References

1) OHARA optical glass datasheets 2015-12-01
2) OHARA Zemax catalog 2015-12-01

Data

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

INFO

Ohara Group

Ohara Group is an international group of companies with headquarters in Japan and subsidiaries in Japan (Ohara, Inc.), United States (Ohara Corporation), and Germany (Ohara, GmbH). Ohara manufactures optical and electronic products and also offers measurement services, in particular measurement of refractive indices of solids and liquids.

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