N-PSK3 by Schott

Preferred Unknown Environmentally Friendly

N-PSK3 by Schott is a preferred optical glass. It transmits from 0.30 to 2.50 µm with an nd of 1.55232 and a Vd of 63.46. It has low thermal expansion (CTE of 6.2×10⁻⁶/K), good chemical resistance, and low relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.500 µm
Optical Properties
Refractive Index (nd) 1.55232
Abbe Number (Vd) 63.46
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{0.887272\,\lambda^2}{\lambda^2 - 0.00469824} + \frac{0.489592\,\lambda^2}{\lambda^2 - 0.0161818} + \frac{1.04865\,\lambda^2}{\lambda^2 - 104.375}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.2
TCE 100/300°C (10-6/K) 7.3
Thermal Conductivity (W/mK) 0.99
Heat Capacity (J/gK) 0.682
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.03 \times 10^{-6} + 2(1.19 \times 10^{-8})\,\Delta T + 3(2.46 \times 10^{-11})\,\Delta T^2 + \frac{3.14 \times 10^{-7} + 2(2.45 \times 10^{-10})\,\Delta T}{\lambda - 0.235}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.91
Relative Cost 1.3
Mechanical Properties
Young's Modulus (GPa) 84.0
Poisson's Ratio 0.23
Knoop Hardness (kgf/mm²) 630.0
Chemical Resistance
Climatic Resistance 3
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 2
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PCD3 Hoya 1.55232 63.424095
H-BAK4 CDGM 1.55248 63.36549
H-BAK3 CDGM 1.54678 62.776077
L-PHL2 Ohara 1.5588 62.558541
K-PG375 Sumita 1.5425 62.9
K-PG375(M) Sumita 1.53922 62.7
BBO-E Generic Birefringent 1.552518 61.321496
BAL22 Ohara 1.568729 63.162358
S-BAL22 Ohara 1.568729 63.10486
PCD2 Hoya 1.56873 63.105028
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
PSK3 Schott 1.552322 63.456253
PSK2 Schott 1.56873 63.083014
N-SK11 Schott 1.56384 60.8
SK11 Schott 1.56384 60.798869
BK6 Schott 1.531129 62.150728
PK3 Schott 1.525419 64.662422
PSK50 Schott 1.557529 67.282893
N-BAK2 Schott 1.53996 59.71
BAK2 Schott 1.53996 59.708588
BK8 Schott 1.520152 63.685744
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