LAM61 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: 0.340–2.400 µm
Optical Properties
Refractive Index (nd) 1.720002
Abbe Number (Vd) 46.035166
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.70602\,\lambda^2}{\lambda^2 - 0.00957977} + \frac{0.182716\,\lambda^2}{\lambda^2 - 0.040441} + \frac{1.20483\,\lambda^2}{\lambda^2 - 127.571}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.5
TCE 100/300°C (10-6/K) 9.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.7708 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.28
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 53
Alkali Resistance —
Phosphate Resistance 3
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
LAFN11 Sumita 1.72013 46.0
K-LaFn11 Sumita 1.72013 46.0
H-LAF2 CDGM 1.717 47.888609
LAF3 Sumita 1.717 47.9
N-LAF3 Schott 1.717 47.96
LAF3 Schott 1.716998 47.961124
LAF30 Hoya 1.717 47.97772
LAF3 Hoya 1.717 47.98
D17-48 Corning 1.717011 47.998493
LAFL5 Hoya 1.719998 43.903303
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
S-LAM61 Ohara 1.720002 46.024571
S-LAM3 Ohara 1.717004 47.927969
LAM3 Ohara 1.717004 47.942632
LAM52 Ohara 1.72 43.705625
S-LAM52 Ohara 1.72 43.689812
L-LAM72 Ohara 1.733099 48.896607
LAM51 Ohara 1.699998 48.078869
S-LAM51 Ohara 1.699998 48.080479
LAM2 Ohara 1.743997 44.787528
S-LAM2 Ohara 1.743997 44.786431
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