H-ZLAF55D by CDGM

Preferred Very Common Environmentally Friendly

H-ZLAF55D by CDGM is a preferred optical glass with a very common melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.83481 and a Vd of 42.725177. It has low thermal expansion (CTE of 6.4×10⁻⁶/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: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.83481
Abbe Number (Vd) 42.725177
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.227765\,\lambda^2}{\lambda^2 - 0.0412222} + \frac{2.04687\,\lambda^2}{\lambda^2 - 0.0107489} + \frac{1.20889\,\lambda^2}{\lambda^2 - 87.8519}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.4
TCE 100/300°C (10-6/K) 8.1
Thermal Conductivity (W/mK) 0.722
Heat Capacity (J/gK) 0.459
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.05 \times 10^{-6} + 2(1.59 \times 10^{-8})\,\Delta T + 3(-2.67 \times 10^{-11})\,\Delta T^2 + \frac{6.94 \times 10^{-7} + 2(2.64 \times 10^{-10})\,\Delta T}{\lambda - 0.221}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.56
Relative Cost 6.2
Mechanical Properties
Young's Modulus (GPa) 123.59
Poisson's Ratio 0.299
Knoop Hardness (kgf/mm²) 684.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAH55V Ohara 1.834807 42.725324
LAH55 Ohara 1.834807 42.72372
TAFD5F Hoya 1.83481 42.72
TAFD5G Hoya 1.83481 42.72
S-LAH55 Ohara 1.834807 42.713673
S-LAH55VS Ohara 1.834809 42.74368
K-LaSFn8W Sumita 1.8349 42.7
LASFN8 Sumita 1.835 42.7
K-LaSFn8 Sumita 1.835 42.7
TAFD5 Hoya 1.835 42.984244
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-ZLAF55C CDGM 1.83481 42.711575
D-ZLAF61 CDGM 1.82241 42.714541
D-ZLAF61-25 CDGM 1.82131 42.674895
D-ZLAF85LN-25 CDGM 1.84443 40.067973
D-ZLAF85LN CDGM 1.84558 40.094322
D-ZLAF85L-25 CDGM 1.8526 40.534071
D-ZLAF85LS-25 CDGM 1.85344 40.557917
D-ZLAF85L CDGM 1.8537 40.579411
D-ZLAF85LS CDGM 1.8545 40.593546
D-ZLAF85A-25 CDGM 1.8511 40.055609
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