H-ZLAF4LA by CDGM

Preferred Very Common Environmentally Friendly

H-ZLAF4LA by CDGM is a preferred optical glass with a very common melt frequency. It transmits from 0.36 to 2.40 µm with an nd of 1.91082 and a Vd of 35.25034. It has medium thermal expansion (CTE of 7.1×10⁻⁶/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: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.91082
Abbe Number (Vd) 35.25034
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{2.21255\,\lambda^2}{\lambda^2 - 0.0118173} + \frac{0.312543\,\lambda^2}{\lambda^2 - 0.0495863} + \frac{1.56862\,\lambda^2}{\lambda^2 - 115.526}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) 0.853
Heat Capacity (J/gK) 0.431
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.14 \times 10^{-6} + 2(1.37 \times 10^{-8})\,\Delta T + 3(-2.92 \times 10^{-11})\,\Delta T^2 + \frac{8.94 \times 10^{-7} + 2(8.6 \times 10^{-10})\,\Delta T}{\lambda - 0.239}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.07
Relative Cost 8.1
Mechanical Properties
Young's Modulus (GPa) 126.95
Poisson's Ratio 0.304
Knoop Hardness (kgf/mm²) 728.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
TAFD35 Hoya 1.91082 35.25
TAFD35L Hoya 1.91082 35.25
K-LaSFn23 Sumita 1.911 35.2
S-LAH93 Ohara 1.90525 35.036826
CAWO4 Generic Birefringent 1.920414 34.953592
TAFD31 Hoya 1.922501 35.946005
LASFN22 Sumita 1.898 34.0
K-LaSFn22 Sumita 1.898 34.0
TAFD37A Hoya 1.90043 37.37
TAFD37 Hoya 1.90043 37.37
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZLAF4LB CDGM 1.91082 35.282389
H-ZLAF78B CDGM 1.90069 37.050531
H-ZLAF75B CDGM 1.90366 31.418411
H-ZLAF75C CDGM 1.90366 31.357126
H-ZLAF75A CDGM 1.90366 31.31497
D-ZLAF67 CDGM 1.88385 37.198899
D-ZLAF67-25 CDGM 1.88259 37.185491
H-ZLAF68N CDGM 1.883 39.2182
H-ZLAF68NB CDGM 1.883 39.235474
H-ZLAF73 CDGM 1.881 40.161331
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