S-LAM52 by Ohara

Special Unknown Environmentally Friendly

S-LAM52 by Ohara is a special optical glass. It transmits from 0.35 to 2.40 µm with an nd of 1.72 and a Vd of 43.689812. It has medium thermal expansion (CTE of 7.7×10⁻⁶/K) and below average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365015–2.32542 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365015–2.32542 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.400 µm
Optical Properties
Refractive Index (nd) 1.72
Abbe Number (Vd) 43.689812
Dispersion Formula Sellmeier
Wavelength Range 0.365015 — 2.32542 µm
$$n(\lambda) = \sqrt{1 + \frac{1.73443\,\lambda^2}{\lambda^2 - 0.0100691} + \frac{0.151554\,\lambda^2}{\lambda^2 - 0.0470635} + \frac{1.46225\,\lambda^2}{\lambda^2 - 140.084}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.7
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.33 \times 10^{-6} + 2(1.04 \times 10^{-8})\,\Delta T + 3(-3.33 \times 10^{-11})\,\Delta T^2 + \frac{6.18 \times 10^{-7} + 2(7.64 \times 10^{-10})\,\Delta T}{\lambda - 0.246}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.95
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 51
Alkali Resistance —
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-LAF62 CDGM 1.72 43.680739
LAFN4 Sumita 1.72 43.7
LAFL5 Hoya 1.719998 43.903303
LAFL4 Hoya 1.712704 43.295113
LAFN10 Sumita 1.72016 42.1
LAFL6 Hoya 1.72 42.016239
K-LaFn11 Sumita 1.72013 46.0
LAFN11 Sumita 1.72013 46.0
LAFN8 Schott 1.735197 41.590899
LAF2 Schott 1.744002 44.719972
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
LAM52 Ohara 1.72 43.705625
LAM58 Ohara 1.72 41.989859
S-LAM58 Ohara 1.72 41.978463
S-LAM61 Ohara 1.720002 46.024571
LAM61 Ohara 1.720002 46.035166
S-LAM2 Ohara 1.743997 44.786431
LAM2 Ohara 1.743997 44.787528
L-LAM69 Ohara 1.73077 40.508156
BAH27 Ohara 1.701536 41.242277
S-BAH27 Ohara 1.701536 41.23944
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