FDS165-W by Hoya

Preferred Very Common Environmentally Dangerous

FDS165-W by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.39 to 2.50 µm with an nd of 1.98611 and a Vd of 17.25. It has low thermal expansion (CTE of 4.6×10⁻⁶/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: 0.390–2.500 µm
Optical Properties
Refractive Index (nd) 1.98611
Abbe Number (Vd) 17.25
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.69657 - 0.0254601\,\lambda^2 + 0.0642616\,\lambda^{-2} + 0.0106391\,\lambda^{-4} - 0.00119151\,\lambda^{-6} + 0.000147785\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 4.6
TCE 100/300°C (10-6/K) 5.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.19 \times 10^{-7} + 2(1.15 \times 10^{-8})\,\Delta T + 3(-1.75 \times 10^{-11})\,\Delta T^2 + \frac{1.3 \times 10^{-6} + 2(1.64 \times 10^{-9})\,\Delta T}{\lambda - 0.321}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.62
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
K-PSFn2(M) Sumita 1.9967 20.6
S-NPH3 Ohara 1.95906 17.471252
H-ZF73 CDGM 1.95906 17.472434
H-ZF73GT CDGM 1.95906 17.472434
D-ZF93-25 CDGM 1.9998 20.686444
K-PSFn2 Sumita 2.0017 20.6
D-ZF93 CDGM 2.0017 20.700195
P-SF68 Schott 2.0052 21.0
K-PSFn203(M) Sumita 2.01105 20.8
ZNO Generic Birefringent 2.003385 12.424016
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
FDS16-W Hoya 1.98612 16.48
MC-FDS2 Hoya 2.00178 19.32
M-FDS2 Hoya 2.00178 19.32
MP-FDS2 Hoya 2.00178 19.32
E-FDS2 Hoya 2.00272 19.32
FDS18-W Hoya 1.94595 17.98
FDS18 Hoya 1.94595 17.98
TAFD43 Hoya 2.002944 23.512743
TAFD40 Hoya 2.00069 25.46
TAFD40-W Hoya 2.00069 25.46
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