LAM7 by Ohara

Obsolete Unknown Environmentally Friendly
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.400 µm
Optical Properties
Refractive Index (nd) 1.749497
Abbe Number (Vd) 35.278026
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.73419\,\lambda^2}{\lambda^2 - 0.0111076} + \frac{0.23149\,\lambda^2}{\lambda^2 - 0.0515328} + \frac{1.5171\,\lambda^2}{\lambda^2 - 163.413}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) 9.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.1859 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.55
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 5
Alkali Resistance —
Phosphate Resistance 3
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
LAF7 Hoya 1.749497 35.042695
E-LAF7 Hoya 1.7495 35.04
LAF70 Sumita 1.7495 35.0
H-LAF4 CDGM 1.7495 34.989266
H-LAF4GT CDGM 1.7495 34.989266
LAFN7 Schott 1.7495 34.95
N-LAF7 Schott 1.7495 34.82
NBFD6 Hoya 1.756702 36.345258
H-LAFL5 CDGM 1.75367 37.491665
BASF54 Schott 1.73627 32.149453
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
S-LAM7 Ohara 1.749497 35.283397
S-NBH51 Ohara 1.749504 35.33248
S-NBH59 Ohara 1.766342 35.82343
S-NBH53V Ohara 1.737999 32.32659
S-NBH53 Ohara 1.737999 32.261312
BPH50 Ohara 1.739997 31.710001
BPH8 Ohara 1.720467 34.716156
S-NBH8 Ohara 1.720467 34.707984
BAH28 Ohara 1.72342 37.949115
S-BAH28 Ohara 1.72342 37.955602
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