TAFD33 by Hoya

Preferred Very Common Environmentally Dangerous

TAFD33 by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.34 to 2.50 µm with an nd of 1.881 and a Vd of 40.14. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K), excellent chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36501–1.5296 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36501–1.5296 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.500 µm
Optical Properties
Refractive Index (nd) 1.881
Abbe Number (Vd) 40.14
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.4317 - 0.0131563\,\lambda^2 + 0.0356319\,\lambda^{-2} + 0.000913781\,\lambda^{-4} - 4.03669 \times 10^{-6}\,\lambda^{-6} + 3.38677 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.8
TCE 100/300°C (10-6/K) 8.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.04 \times 10^{-6} + 2(9.9 \times 10^{-9})\,\Delta T + 3(-5.86 \times 10^{-11})\,\Delta T^2 + \frac{9.55 \times 10^{-7} + 2(8.81 \times 10^{-10})\,\Delta T}{\lambda - 0.159}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.4
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 1
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Notes

Recommended glass type

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-ZLAF73 CDGM 1.881 40.161331
N-LASF31A Schott 1.883 40.76
S-LAH58 Ohara 1.882997 40.765107
LAH58 Ohara 1.882997 40.778667
K-LaSFn17 Sumita 1.883 40.8
H-ZLAF68B CDGM 1.883004 40.806875
H-ZLAF68C CDGM 1.883 40.847465
LASFN17 Sumita 1.883 40.9
LASFN31 Schott 1.880669 41.009774
N-LASF31 Schott 1.88067 41.01
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
TAFD30 Hoya 1.883 40.81
TAFD32 Hoya 1.8707 40.73
TAFD17 Hoya 1.877999 38.197051
M-TAFD307 Hoya 1.88202 37.22
MP-TAFD307 Hoya 1.88202 37.22
MC-TAFD307 Hoya 1.88202 37.22
MC-TAFD317 Hoya 1.8812 37.17
TAFD37A Hoya 1.90043 37.37
TAFD37 Hoya 1.90043 37.37
MC-TAFD305 Hoya 1.85135 40.1
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