FDS9 by Hoya

Obsolete Unknown Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.25–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.25–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–1.550 µm
Optical Properties
Refractive Index (nd) 1.846658
Abbe Number (Vd) 23.826345
Dispersion Formula Schott
Wavelength Range 0.25 — 1.55 µm
$$n(\lambda) = \sqrt{3.25875 - 0.014909\,\lambda^2 + 0.0413807\,\lambda^{-2} + 0.00541396\,\lambda^{-4} - 0.000490912\,\lambda^{-6} + 4.51388 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 90.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.459 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.54
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
ZF52 CDGM 1.846669 23.827549
SF57HT Schott 1.84666 23.83
SF57 Schott 1.84666 23.83
SF57HTultra Schott 1.84666 23.83
K-SFLDn3 Sumita 1.8467 23.8
K-SFLDn3W Sumita 1.8467 23.8
H-ZF52A CDGM 1.84667 23.791236
H-ZF52TT CDGM 1.84666 23.784497
H-ZF52GT CDGM 1.84666 23.784497
H-ZF52 CDGM 1.84666 23.784497
Similar Glasses (Hoya)
Glass Manufacturer nd Vd
FDS90-SGP Hoya 1.84666 23.84
FDS90-SG Hoya 1.84666 23.78
FDS90 Hoya 1.84666 23.78
NBFD25 Hoya 1.85451 25.15
NBFD26 Hoya 1.83401 25.97
MC-FDS910-50 Hoya 1.82165 24.04
MP-FDS910-50 Hoya 1.82165 24.04
M-FDS910 Hoya 1.82115 24.06
FDS20-W Hoya 1.86966 20.02
FD225 Hoya 1.80809 22.76
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