D-LAK52-25 by CDGM

Standard Rare Precision Molding Environmentally Friendly

D-LAK52-25 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 1.72924 and a Vd of 53.851219. It has low thermal expansion (CTE of 6.1×10⁻⁶/K), excellent chemical resistance, high relative cost, and precision molding compatibility.

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) 1.72924
Abbe Number (Vd) 53.851219
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.04346\,\lambda^2}{\lambda^2 - 0.0173669} + \frac{0.888613\,\lambda^2}{\lambda^2 - 0.00301494} + \frac{1.23103\,\lambda^2}{\lambda^2 - 87.1256}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.1
TCE 100/300°C (10-6/K) 7.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.8 \times 10^{-6} + 2(1.72 \times 10^{-8})\,\Delta T + 3(-5.24 \times 10^{-11})\,\Delta T^2 + \frac{4.52 \times 10^{-7} + 2(1.37 \times 10^{-10})\,\Delta T}{\lambda - 0.229}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.0
Relative Cost 10.6
Mechanical Properties
Young's Modulus (GPa) 121.43
Poisson's Ratio 0.289
Knoop Hardness (kgf/mm²) 669.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

anneal rate:25℃/h

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
M-TAC80 Hoya 1.72903 54.04
MP-TAC80-60 Hoya 1.72963 54.07
S-LAL19 Ohara 1.72916 54.095223
S-LAL60 Ohara 1.725999 53.565698
LAL60 Ohara 1.725999 53.565698
TAC1 Hoya 1.725999 53.41758
N-LAK34 Schott 1.72916 54.5
TAC8P Hoya 1.72916 54.54
TAC8 Hoya 1.72916 54.67
S-LAL18 Ohara 1.729157 54.680013
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAK52 CDGM 1.7305 53.944268
H-LAK52 CDGM 1.72916 54.684737
H-LAK61 CDGM 1.740999 52.676196
H-LAK7A CDGM 1.713 53.832974
H-LAK54 CDGM 1.734 51.485829
H-LAK72 CDGM 1.713 51.80665
H-LAK8A CDGM 1.72 50.343857
H-LAK3 CDGM 1.74693 50.950085
H-LAK8B CDGM 1.72 50.280736
H-LAK53B CDGM 1.755 52.322058
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