H-ZLAF51 by CDGM

Standard Rare Environmentally Friendly

H-ZLAF51 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 1.8045 and a Vd of 39.635248. It has low thermal expansion (CTE of 5.2×10⁻⁶/K), excellent chemical resistance, and high 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) 1.8045
Abbe Number (Vd) 39.635248
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.22431\,\lambda^2}{\lambda^2 - 91.2452} + \frac{0.30259\,\lambda^2}{\lambda^2 - 0.0426068} + \frac{1.86091\,\lambda^2}{\lambda^2 - 0.00987032}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.2
TCE 100/300°C (10-6/K) 6.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.97 \times 10^{-6} + 2(1.55 \times 10^{-8})\,\Delta T + 3(-3.71 \times 10^{-11})\,\Delta T^2 + \frac{7.79 \times 10^{-7} + 2(9.84 \times 10^{-10})\,\Delta T}{\lambda - 0.233}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.41
Relative Cost 9.6
Mechanical Properties
Young's Modulus (GPa) 111.42
Poisson's Ratio 0.307
Knoop Hardness (kgf/mm²) 664.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
NBFD3 Hoya 1.8045 39.64
S-LAH63 Ohara 1.804398 39.58615
LAH63 Ohara 1.804398 39.581254
S-LAH63Q Ohara 1.8044 39.580489
K-LaSFn2 Sumita 1.805 39.6
LASFN2 Sumita 1.805 39.6
L-LAH81 Ohara 1.8061 40.400738
P-LASF50 Schott 1.8086 40.46
N-LASF43 Schott 1.8061 40.61
L-LAH84 Ohara 1.80835 40.548503
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZLAF52 CDGM 1.806099 40.945389
H-ZLAF52A CDGM 1.8061 41.016887
D-ZLAF81-25 CDGM 1.80757 40.97334
D-ZLAF52LA-25 CDGM 1.80882 40.970313
D-ZLAF81 CDGM 1.8088 40.999441
D-ZLAF52LA CDGM 1.81 40.992863
H-LAF54 CDGM 1.799519 42.253294
D-ZLAF61-25 CDGM 1.82131 42.674895
D-ZLAF61 CDGM 1.82241 42.714541
H-LAF7 CDGM 1.78179 37.092107
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