LAC7 by Hoya

Special Very Rare Environmentally Dangerous

LAC7 by Hoya is a special optical glass with a very rare melt frequency. It transmits from 0.29 to 1.55 µm with an nd of 1.6516 and a Vd of 58.4. It has medium thermal expansion (CTE of 6.9×10⁻⁶/K), below average 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: 0.290–1.550 µm
Optical Properties
Refractive Index (nd) 1.6516
Abbe Number (Vd) 58.4
Dispersion Formula Schott
Wavelength Range 0.36501 — 1.5296 µm
$$n(\lambda) = \sqrt{2.68762 - 0.0143752\,\lambda^2 + 0.012546\,\lambda^{-2} + 0.00146423\,\lambda^{-4} - 0.000169825\,\lambda^{-6} + 8.80486 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.9
TCE 100/300°C (10-6/K) 8.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.52599 \times 10^{-7} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.62
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 4
Stain Resistance —
Acid Resistance 5
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
H-LAK50A CDGM 1.6516 58.403057
K-LaK7 Sumita 1.6516 58.3
LAK7 Sumita 1.6516 58.3
C52-58 Corning 1.6516 58.511488
LAKN7 Schott 1.6516 58.517773
LAL7 Ohara 1.651597 58.519433
N-LAK7 Schott 1.6516 58.52
S-LAL7Q Ohara 1.6516 58.544459
S-LAL7 Ohara 1.651597 58.550655
BSM36 Ohara 1.642495 58.369399
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
LAC6 Hoya 1.642498 57.959359
LAC11 Hoya 1.658296 57.262085
LACL1 Hoya 1.640851 56.835319
LACL6 Hoya 1.640003 60.153568
LACL60 Hoya 1.64 60.2
LACL2 Hoya 1.650201 55.737216
LACL7 Hoya 1.669996 57.308358
BACD18 Hoya 1.63854 55.45
MP-PCD55AR Hoya 1.63858 55.18
M-PCD55AR Hoya 1.63858 55.18
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