H-BAK1 by CDGM

Standard Rare Environmentally Friendly

H-BAK1 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 1.53028 and a Vd of 60.466139. It has medium thermal expansion (CTE of 7.3×10⁻⁶/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: 0.280–2.400 µm
Optical Properties
Refractive Index (nd) 1.53028
Abbe Number (Vd) 60.466139
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.685985\,\lambda^2}{\lambda^2 - 0.0154934} + \frac{0.901677\,\lambda^2}{\lambda^2 - 106.589} + \frac{0.622429\,\lambda^2}{\lambda^2 - 0.0022267}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.3
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-8.49 \times 10^{-7} + 2(1.79 \times 10^{-8})\,\Delta T + 3(-4.72 \times 10^{-11})\,\Delta T^2 + \frac{4.45 \times 10^{-7} + 2(6.36 \times 10^{-10})\,\Delta T}{\lambda - 0.203}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.74
Relative Cost 6.8
Mechanical Properties
Young's Modulus (GPa) 70.95
Poisson's Ratio 0.223
Knoop Hardness (kgf/mm²) 486.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BACL1 Hoya 1.526417 60.113677
C40 Hoya 1.523 60.4016
UK50 Schott 1.522571 60.383109
K50 Schott 1.522572 60.179756
S-NSL5 Ohara 1.522494 59.835417
NSL5 Ohara 1.522494 59.790926
K5 Sumita 1.52249 59.6
B23-59 Corning 1.522996 59.479482
K5HT Schott 1.522453 59.530889
K5 Schott 1.522489 59.482671
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-K11 CDGM 1.52638 60.15737
H-K50 CDGM 1.52249 59.480754
H-BAK2 CDGM 1.53996 59.724182
H-K51 CDGM 1.52307 58.639792
H-K7 CDGM 1.51478 60.634896
H-K10 CDGM 1.51818 58.949331
H-K6 CDGM 1.511125 60.478905
K4A CDGM 1.50802 61.052897
H-K90GTI CDGM 1.51948 63.291634
H-BAK3 CDGM 1.54678 62.776077
Compare Glasses
    Compare Selected