BAH78 by Ohara

Obsolete Unknown Environmentally Dangerous

BAH78 by Ohara is an obsolete optical glass. It transmits from 0.34 to 0.70 µm with an nd of 1.723421 and a Vd of 38.03427. It has medium thermal expansion (CTE of 6.9×10⁻⁶/K), below average chemical resistance, and dangerous environmental properties.

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: 0.340–0.700 µm
Optical Properties
Refractive Index (nd) 1.723421
Abbe Number (Vd) 38.03427
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.88844 - 0.0108827\,\lambda^2 + 0.0264187\,\lambda^{-2} + 0.00116785\,\lambda^{-4} - 5.22459 \times 10^{-5}\,\lambda^{-6} + 6.28816 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.9
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.775 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.24
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 51
Alkali Resistance —
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BASF8 Sumita 1.72342 38.0
D23-38 Corning 1.72349 37.995089
H-ZBAF21 CDGM 1.72341 37.991564
BAFD8 Hoya 1.72342 37.99
BASF51 Schott 1.723728 38.111094
ZNSF8 Sumita 1.7143 38.9
K-ZnSF8 Sumita 1.7143 38.9
K-ZnSF8(M) Sumita 1.71143 38.9
D-LAF79-25 CDGM 1.72986 40.497566
MP-LAF81 Hoya 1.73077 40.5
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-BAH28 Ohara 1.72342 37.955602
BAH28 Ohara 1.72342 37.949115
L-LAM69 Ohara 1.73077 40.508156
BPH8 Ohara 1.720467 34.716156
S-NBH8 Ohara 1.720467 34.707984
BAH71 Ohara 1.701998 40.097173
S-LAM58 Ohara 1.72 41.978463
LAM58 Ohara 1.72 41.989859
BAH77 Ohara 1.701539 41.21001
S-BAH27 Ohara 1.701536 41.23944
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