H-BAK3 by CDGM

Standard Rare Environmentally Friendly

H-BAK3 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.29 to 2.40 µm with an nd of 1.54678 and a Vd of 62.776077. It has low thermal expansion (CTE of 6.2×10⁻⁶/K), excellent chemical resistance, and moderate 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: 0.290–2.400 µm
Optical Properties
Refractive Index (nd) 1.54678
Abbe Number (Vd) 62.776077
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.635129\,\lambda^2}{\lambda^2 - 0.00255407} + \frac{0.92084\,\lambda^2}{\lambda^2 - 92.9065} + \frac{0.724654\,\lambda^2}{\lambda^2 - 0.014358}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.2
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.04 \times 10^{-6} + 2(1.91 \times 10^{-8})\,\Delta T + 3(-3.23 \times 10^{-11})\,\Delta T^2 + \frac{4.56 \times 10^{-7} + 2(2.05 \times 10^{-10})\,\Delta T}{\lambda - 0.176}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.84
Relative Cost 3.1
Mechanical Properties
Young's Modulus (GPa) 79.89
Poisson's Ratio 0.23
Knoop Hardness (kgf/mm²) 530.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-PG375 Sumita 1.5425 62.9
PCD3 Hoya 1.55232 63.424095
PSK3 Schott 1.552322 63.456253
N-PSK3 Schott 1.55232 63.46
K-PG375(M) Sumita 1.53922 62.7
L-PHL2 Ohara 1.5588 62.558541
BBO-E Generic Birefringent 1.552518 61.321496
BK6 Schott 1.531129 62.150728
BSC6 Hoya 1.531128 62.075664
SK20 Sumita 1.55963 61.2
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-BAK4 CDGM 1.55248 63.36549
H-ZK1 CDGM 1.56888 62.95699
H-BAK6 CDGM 1.56388 60.764747
H-BAK2 CDGM 1.53996 59.724182
H-BAK1 CDGM 1.53028 60.466139
H-K90GTI CDGM 1.51948 63.291634
H-K11 CDGM 1.52638 60.15737
D-K59 CDGM 1.5176 63.499991
D-K59-25 CDGM 1.51698 63.4085
H-K9LAGT CDGM 1.5168 64.198695
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