LACL9 by Hoya

Obsolete Unknown Environmentally Dangerous

LACL9 by Hoya is an obsolete optical glass. It transmits from 0.33 to 1.55 µm with an nd of 1.6779 and a Vd of 50.551353. It has average chemical resistance, moderate relative cost, and dangerous environmental properties.

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: 0.330–1.550 µm
Optical Properties
Refractive Index (nd) 1.6779
Abbe Number (Vd) 50.551353
Dispersion Formula Schott
Wavelength Range 0.25 — 1.55 µm
$$n(\lambda) = \sqrt{2.7575 - 0.00968057\,\lambda^2 + 0.0199924\,\lambda^{-2} + 0.000386599\,\lambda^{-4} - 1.18691 \times 10^{-6}\,\lambda^{-6} + 8.60859 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 83.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.9
Relative Cost 5.5
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 3
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAKN8 Sumita 1.678 50.7
S-LAL56 Ohara 1.677898 50.722184
LAL56 Ohara 1.677898 50.723364
LAKN7 Sumita 1.67 51.7
K-LaKn7 Sumita 1.67 51.7
H-LAK67 CDGM 1.67 51.738482
LAFN1 Sumita 1.685 49.2
LAFN23 Schott 1.689004 49.711581
C90-50 Corning 1.689009 49.625392
LAKN10 Sumita 1.692 50.6
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
LACL4 Hoya 1.669603 51.65903
LAFL1 Hoya 1.686004 49.347081
LAFL23 Hoya 1.689 49.475821
LACL5 Hoya 1.693503 50.787122
LAFL20 Hoya 1.68248 48.197606
BAF21 Hoya 1.66422 48.941939
BACED5 Hoya 1.65844 50.86
BAF11 Hoya 1.66672 48.3
LACL8 Hoya 1.677896 53.419218
LAFL2 Hoya 1.697 48.514006
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