H-LAF1 by CDGM

Standard Rare Environmentally Friendly

H-LAF1 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.40 µm with an nd of 1.69362 and a Vd of 49.193837. It has medium thermal expansion (CTE of 7.1×10⁻⁶/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: 0.340–2.400 µm
Optical Properties
Refractive Index (nd) 1.69362
Abbe Number (Vd) 49.193837
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.16155\,\lambda^2}{\lambda^2 - 106.693} + \frac{1.49001\,\lambda^2}{\lambda^2 - 0.00736542} + \frac{0.317836\,\lambda^2}{\lambda^2 - 0.0313945}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1 \times 10^{-6} + 2(2.31 \times 10^{-8})\,\Delta T + 3(-1.6 \times 10^{-10})\,\Delta T^2 + \frac{5.94 \times 10^{-7} + 2(-4.95 \times 10^{-10})\,\Delta T}{\lambda - 0.215}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.85
Relative Cost 6.1
Mechanical Properties
Young's Modulus (GPa) 101.38
Poisson's Ratio 0.289
Knoop Hardness (kgf/mm²) 613.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAFL23 Hoya 1.689 49.475821
C90-50 Corning 1.689009 49.625392
LAM59 Ohara 1.697002 48.535864
LAFN23 Schott 1.689004 49.711581
S-LAM59 Ohara 1.697002 48.516066
LAFL2 Hoya 1.697 48.514006
LAFN2 Sumita 1.697 48.5
LAFL1 Hoya 1.686004 49.347081
LAFN1 Sumita 1.685 49.2
S-LAM51 Ohara 1.699998 48.080479
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAF51 CDGM 1.7 48.079839
H-LAF2 CDGM 1.717 47.888609
H-LAK71 CDGM 1.703 52.406734
H-ZBAF5 CDGM 1.67103 47.288963
H-LAK72 CDGM 1.713 51.80665
H-ZBAF16 CDGM 1.66672 48.421731
H-LAK8B CDGM 1.72 50.280736
H-LAK8A CDGM 1.72 50.343857
H-ZBAF52 CDGM 1.67003 47.19506
D-LAK6-25 CDGM 1.69281 53.049215
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