LLF1 by Schott

Preferred Unknown Environmentally Dangerous

LLF1 by Schott is a preferred optical glass. It transmits from 0.31 to 2.50 µm with an nd of 1.54814 and a Vd of 45.75. It has medium thermal expansion (CTE of 8.1×10⁻⁶/K), excellent chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.500 µm
Optical Properties
Refractive Index (nd) 1.54814
Abbe Number (Vd) 45.75
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.2164\,\lambda^2}{\lambda^2 - 0.00857807} + \frac{0.133665\,\lambda^2}{\lambda^2 - 0.0420143} + \frac{0.883399\,\lambda^2}{\lambda^2 - 107.593}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.1
TCE 100/300°C (10-6/K) 9.2
Thermal Conductivity (W/mK) 0.99
Heat Capacity (J/gK) 0.65
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.25 \times 10^{-7} + 2(1.74 \times 10^{-8})\,\Delta T + 3(-6.12 \times 10^{-11})\,\Delta T^2 + \frac{6.53 \times 10^{-7} + 2(2.58 \times 10^{-10})\,\Delta T}{\lambda - 0.233}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.94
Relative Cost 2.1
Mechanical Properties
Young's Modulus (GPa) 60.0
Poisson's Ratio 0.21
Knoop Hardness (kgf/mm²) 450.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 1
Notes

lead containing glass type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PBL1Y Ohara 1.548141 45.733282
PBL1 Ohara 1.548141 45.781144
B48-46 Corning 1.548098 45.718533
S-TIL1 Ohara 1.548141 45.784277
E-FEL1 Hoya 1.54814 45.82
H-QF1 CDGM 1.54814 45.820011
FEL1 Hoya 1.548136 45.822169
QF1 CDGM 1.5481 45.886233
LLF1 Sumita 1.54814 45.9
PBL7 Ohara 1.548689 45.555746
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-LLF1 Schott 1.54814 45.851572
LLF1HT Schott 1.548144 45.888593
LLF1HTi Schott 1.54815 45.9
LLF7 Schott 1.548831 45.40834
LLF2 Schott 1.540719 47.171344
LF8 Schott 1.564435 43.75028
TIF3 Schott 1.547649 42.203707
LLF6 Schott 1.531719 48.762595
N-LLF6 Schott 1.531688 48.895238
LF6HT Schott 1.56732 42.847665
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