LASF35 by Schott

Preferred Unknown Environmentally Dangerous

LASF35 by Schott is a preferred optical glass. It transmits from 0.38 to 2.50 µm with an nd of 2.02204 and a Vd of 29.06. It has medium thermal expansion (CTE of 7.4×10⁻⁶/K), excellent chemical resistance, very high relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.37–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.37–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.380–2.500 µm
Optical Properties
Refractive Index (nd) 2.02204
Abbe Number (Vd) 29.06
Dispersion Formula Sellmeier
Wavelength Range 0.37 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{2.45506\,\lambda^2}{\lambda^2 - 0.013567} + \frac{0.453006\,\lambda^2}{\lambda^2 - 0.0545803} + \frac{2.38513\,\lambda^2}{\lambda^2 - 167.905}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.4
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) 0.92
Heat Capacity (J/gK) 0.445
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.43 \times 10^{-7} + 2(8.71 \times 10^{-9})\,\Delta T + 3(-2.71 \times 10^{-11})\,\Delta T^2 + \frac{1.02 \times 10^{-6} + 2(1.5 \times 10^{-9})\,\Delta T}{\lambda - 0.263}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.41
Relative Cost 36.7
Mechanical Properties
Young's Modulus (GPa) 132.0
Poisson's Ratio 0.3
Knoop Hardness (kgf/mm²) 810.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-BOC20 Sumita 2.0054 27.7
H-ZLAF92 CDGM 2.0033 28.316305
H-ZLAF92A CDGM 2.0033 28.275906
S-LAH79 Ohara 2.0033 28.27328
TAFD55-W Hoya 2.001 29.13
TAFD55 Hoya 2.001 29.13
S-LAH99 Ohara 2.001 29.139473
S-LAH99W Ohara 2.001 29.139473
H-ZLAF91 CDGM 2.001 29.151347
K-BOC30 Sumita 2.0068 26.2
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
REALVIEW_2.0 Schott 2.001017 29.14
P-SF68 Schott 2.0052 21.0
N-LASF55 Schott 1.9538 30.56
SF59 Schott 1.952497 20.363706
LASF18A Schott 1.913482 32.364492
REALVIEW_1.9_LIGHTWEIGHT Schott 1.922002 21.44
N-SF66 Schott 1.92286 20.88
SF66 Schott 1.92286 20.88
SF58 Schott 1.917613 21.51112
N-LASF46A Schott 1.90366 31.32
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