K-LaFK63(M) by Sumita

Standard Rare Environmentally Friendly

K-LaFK63(M) by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.27 to 2.00 µm with an nd of 1.63463 and a Vd of 63.0. It has medium thermal expansion (CTE of 9.5×10⁻⁶/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: 0.270–2.000 µm
Optical Properties
Refractive Index (nd) 1.63463
Abbe Number (Vd) 63.0
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.63098 - 0.0104319\,\lambda^2 + 0.0149249\,\lambda^{-2} + 0.000126932\,\lambda^{-4} + 1.73464 \times 10^{-5}\,\lambda^{-6} - 8.76531 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.5
TCE 100/300°C (10-6/K) 11.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.02 \times 10^{-5} + 2(8.45 \times 10^{-9})\,\Delta T + 3(-7.16 \times 10^{-11})\,\Delta T^2 + \frac{4.42 \times 10^{-7} + 2(5.71 \times 10^{-10})\,\Delta T}{\lambda - 0.158}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.36
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 5
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PSK53A Schott 1.620141 63.480444
N-PSK53 Schott 1.62014 63.48
PCD53 Hoya 1.620139 63.516754
D-ZPK1A CDGM 1.62087 63.828532
D-ZPK1A-25 CDGM 1.61999 63.763831
ATC1 Hoya 1.62 62.19284
ADC1 Hoya 1.62 62.192825
PCD40 Hoya 1.61997 63.88
MP-PCD4-40 Hoya 1.61921 63.85
MC-PCD4-40 Hoya 1.61921 63.85
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-LaFK63 Sumita 1.6386 63.4
K-LaFK60 Sumita 1.63246 63.8
LAFK60 Sumita 1.63246 63.8
K-LaFK60(M) Sumita 1.62848 63.2
K-PSKn2 Sumita 1.618 63.4
PSKN2 Sumita 1.618 63.4
K-LaFK65(M) Sumita 1.65224 62.2
K-LaKn2 Sumita 1.6405 60.1
LAKN2 Sumita 1.6405 60.1
K-LaFK65 Sumita 1.6567 62.3
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