H-LAK53A by CDGM

Standard Rare Environmentally Friendly

H-LAK53A by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.28 to 2.40 µm with an nd of 1.755 and a Vd of 52.320574. It has low thermal expansion (CTE of 6.1×10⁻⁶/K) and high relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.302–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.302–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.280–2.400 µm
Optical Properties
Refractive Index (nd) 1.755
Abbe Number (Vd) 52.320574
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.21007\,\lambda^2}{\lambda^2 - 0.0052168} + \frac{1.19496\,\lambda^2}{\lambda^2 - 83.5558} + \frac{0.806533\,\lambda^2}{\lambda^2 - 0.0200804}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.1
TCE 100/300°C (10-6/K) 7.2
Thermal Conductivity (W/mK) 0.71
Heat Capacity (J/gK) 0.458
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.86 \times 10^{-6} + 2(1.36 \times 10^{-8})\,\Delta T + 3(-2.33 \times 10^{-11})\,\Delta T^2 + \frac{5.16 \times 10^{-7} + 2(5.98 \times 10^{-10})\,\Delta T}{\lambda - 0.185}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.39
Relative Cost 11.6
Mechanical Properties
Young's Modulus (GPa) 106.63
Poisson's Ratio 0.287
Knoop Hardness (kgf/mm²) 729.0
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
TAC6L Hoya 1.755 52.32
TAC6 Hoya 1.755 52.32
S-YGH51 Ohara 1.754998 52.321434
S-LAH97 Ohara 1.755 52.318818
YGH51 Ohara 1.754998 52.326713
N-LAK33B Schott 1.755 52.3
LASKN1 Sumita 1.755 52.4
K-LaSKn1 Sumita 1.755 52.4
N-LAK33A Schott 1.75393 52.27
LAK33 Schott 1.753977 52.430467
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAK53B CDGM 1.755 52.322058
H-LAK3 CDGM 1.74693 50.950085
H-LAK61 CDGM 1.740999 52.676196
H-LAK54 CDGM 1.734 51.485829
D-LAF53 CDGM 1.7433 49.325949
H-LAF53 CDGM 1.7433 49.221808
D-LAF050-25 CDGM 1.76709 49.197491
D-LAF53-25 CDGM 1.7421 49.246024
D-LAF050 CDGM 1.76842 49.28216
H-LAF50B CDGM 1.7725 49.598996
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