H-LAF55 by CDGM

Standard Rare Environmentally Friendly

H-LAF55 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.35 to 2.40 µm with an nd of 1.762 and a Vd of 40.105472. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.400 µm
Optical Properties
Refractive Index (nd) 1.762
Abbe Number (Vd) 40.105472
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.7392\,\lambda^2}{\lambda^2 - 0.00974401} + \frac{1.16163\,\lambda^2}{\lambda^2 - 111.118} + \frac{0.279488\,\lambda^2}{\lambda^2 - 0.0423325}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.76 \times 10^{-6} + 2(1.53 \times 10^{-8})\,\Delta T + 3(-4.05 \times 10^{-11})\,\Delta T^2 + \frac{7.53 \times 10^{-7} + 2(5.1 \times 10^{-10})\,\Delta T}{\lambda - 0.241}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.3
Relative Cost 7.9
Mechanical Properties
Young's Modulus (GPa) 94.6
Poisson's Ratio 0.291
Knoop Hardness (kgf/mm²) 506.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAM55 Ohara 1.762001 40.100947
S-LAM55 Ohara 1.762001 40.100176
NBFD5 Hoya 1.762001 40.263213
LAFN9 Sumita 1.764 40.3
LAF13 Schott 1.775507 37.836043
K-GIR140 Sumita 1.75106 43.1
NBFD6 Hoya 1.756702 36.345258
LAFN8 Schott 1.735197 41.590899
LAF22A Schott 1.781791 37.196288
M-LAF81 Hoya 1.73077 40.5
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAFL5 CDGM 1.75367 37.491665
H-LAF7 CDGM 1.78179 37.092107
D-LAF79 CDGM 1.73077 40.508021
D-LAF79-25 CDGM 1.72986 40.497566
H-LAF52 CDGM 1.7859 44.187159
H-LAF3B CDGM 1.744 44.900027
H-LAF4 CDGM 1.7495 34.989266
H-LAF4GT CDGM 1.7495 34.989266
H-LAF54 CDGM 1.799519 42.253294
H-ZBAF21 CDGM 1.72341 37.991564
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