E-LAF7 by Hoya

Special Rare Environmentally Friendly

E-LAF7 by Hoya is a special optical glass with a rare melt frequency. It transmits from 0.36 to 1.55 µm with an nd of 1.7495 and a Vd of 35.04. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K) and good chemical resistance.

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: 0.360–1.550 µm
Optical Properties
Refractive Index (nd) 1.7495
Abbe Number (Vd) 35.04
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{2.97042 - 0.0132907\,\lambda^2 + 0.028359\,\lambda^{-2} + 0.00176618\,\lambda^{-4} - 0.000124535\,\lambda^{-6} + 1.39519 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.8
TCE 100/300°C (10-6/K) 8.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.20779 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.72
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 2
Alkali Resistance —
Phosphate Resistance —
Notes

Not in a position to accept new order because of discontinuation.

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAF70 Sumita 1.7495 35.0
H-LAF4 CDGM 1.7495 34.989266
H-LAF4GT CDGM 1.7495 34.989266
LAFN7 Schott 1.7495 34.95
N-LAF7 Schott 1.7495 34.82
LAM7 Ohara 1.749497 35.278026
S-LAM7 Ohara 1.749497 35.283397
S-NBH51 Ohara 1.749504 35.33248
S-NBH59 Ohara 1.766342 35.82343
H-LAFL5 CDGM 1.75367 37.491665
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
LAF7 Hoya 1.749497 35.042695
NBFD6 Hoya 1.756702 36.345258
NBFD9 Hoya 1.756898 31.798532
ADF505 Hoya 1.739996 31.655919
NBFD32 Hoya 1.73037 32.23
ADF455 Hoya 1.71852 33.456548
BAFD8 Hoya 1.72342 37.99
NBFD7 Hoya 1.782999 36.06621
NBFD5 Hoya 1.762001 40.263213
NBFD29 Hoya 1.77047 29.74
Compare Glasses
    Compare Selected