K-LaSKn1 by Sumita

Standard Rare Environmentally Friendly

K-LaSKn1 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.755 and a Vd of 52.4. It has low thermal expansion (CTE of 5.7×10⁻⁶/K) and average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.755
Abbe Number (Vd) 52.4
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{3.0176 - 0.0151224\,\lambda^2 + 0.0219595\,\lambda^{-2} + 0.000521445\,\lambda^{-4} - 1.86939 \times 10^{-5}\,\lambda^{-6} + 1.63694 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.7
TCE 100/300°C (10-6/K) 7.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.54 \times 10^{-7} + 2(1.19 \times 10^{-8})\,\Delta T + 3(-2.27 \times 10^{-10})\,\Delta T^2 + \frac{5.55 \times 10^{-7} + 2(9.65 \times 10^{-10})\,\Delta T}{\lambda - 0.153}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.51
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
YGH51 Ohara 1.754998 52.326713
H-LAK53B CDGM 1.755 52.322058
S-YGH51 Ohara 1.754998 52.321434
H-LAK53A CDGM 1.755 52.320574
TAC6L Hoya 1.755 52.32
TAC6 Hoya 1.755 52.32
S-LAH97 Ohara 1.755 52.318818
N-LAK33B Schott 1.755 52.3
N-LAK33 Schott 1.753977 52.430467
LAK33 Schott 1.753977 52.430467
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
LASKN1 Sumita 1.755 52.4
K-LaKn14 Sumita 1.741 52.7
LAKN14 Sumita 1.741 52.7
K-LaFK50T(M) Sumita 1.76209 49.6
K-LaFK50L Sumita 1.7682 50.0
K-LaFK50T Sumita 1.766 49.8
LAKN12 Sumita 1.7335 51.2
LASKN3 Sumita 1.774 50.5
K-LaFK50(M) Sumita 1.76831 49.7
K-LaFK50 Sumita 1.772 50.0
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