FL57 by Hoya

Obsolete Unknown Environmentally Dangerous

FL57 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.576163 and a Vd of 41.39334. It has dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength

No transmission data available.

Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.576163
Abbe Number (Vd) 41.39334
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.42807 - 0.00799541\,\lambda^2 + 0.0193139\,\lambda^{-2} + 0.00025443\,\lambda^{-4} + 3.7628 \times 10^{-5}\,\lambda^{-6} - 1.49115 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) —
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
QF3 CDGM 1.575026 41.29692
LF7 Sumita 1.57501 41.3
LF7 Schott 1.575011 41.490793
PBL27 Ohara 1.575006 41.491052
H-QF3 CDGM 1.57501 41.504715
S-TIL27 Ohara 1.575006 41.505207
LF4 Sumita 1.57845 41.7
LF5HT Schott 1.581483 40.913786
LF5HTi Schott 1.58144 40.89
H-QF50 CDGM 1.58144 40.888972
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
FL7 Hoya 1.57501 41.509668
FL4 Hoya 1.578447 41.707529
E-FL5 Hoya 1.58144 40.89
FL5 Hoya 1.581437 40.887611
FL3 Hoya 1.58215 42.028564
FL1 Hoya 1.573091 42.586108
E-FL6 Hoya 1.56732 42.84
FL6 Hoya 1.567324 42.843119
BAFD16 Hoya 1.6 42.456745
F8 Hoya 1.595514 39.221686
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