FDS24-SW by Hoya

Preferred Very Common Environmentally Dangerous

FDS24-SW by Hoya is a preferred optical glass with a very common melt frequency. It transmits from 0.37 to 2.50 µm with an nd of 1.92119 and a Vd of 23.96. It has medium thermal expansion (CTE of 7.8×10⁻⁶/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: 0.370–2.500 µm
Optical Properties
Refractive Index (nd) 1.92119
Abbe Number (Vd) 23.96
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{3.51263 - 0.0153015\,\lambda^2 + 0.0539361\,\lambda^{-2} + 0.00349494\,\lambda^{-4} - 0.000179503\,\lambda^{-6} + 3.44032 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.8
TCE 100/300°C (10-6/K) 9.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.37 \times 10^{-6} + 2(7.78 \times 10^{-9})\,\Delta T + 3(-2.33 \times 10^{-11})\,\Delta T^2 + \frac{1.13 \times 10^{-6} + 2(1.32 \times 10^{-9})\,\Delta T}{\lambda - 0.275}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.84
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 for AR/MR

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-PSFn5 Sumita 1.9211 22.4
K-PSFn5(M) Sumita 1.91643 22.4
SF58 Schott 1.917613 21.51112
REALVIEW_1.9_LIGHTWEIGHT Schott 1.922002 21.44
PBH71 Ohara 1.922864 21.288699
L-NBH54 Ohara 1.902 25.101413
PBH72 Ohara 1.915356 21.171926
PBH21 Ohara 1.922861 20.884172
N-SF66 Schott 1.92286 20.88
SF66 Schott 1.92286 20.88
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
FDS24 Hoya 1.92119 23.96
FDS24-W Hoya 1.92119 23.96
FDS1 Hoya 1.922859 20.883457
M-FDS1 Hoya 1.92286 20.88
E-FDS1 Hoya 1.92286 20.88
E-FDS1-W Hoya 1.92286 20.88
MP-FDS1 Hoya 1.92286 20.88
NBFD27 Hoya 1.9011 27.06
TAFD21 Hoya 1.9326 27.921009
NBFD265 Hoya 1.95203 26.2
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