H-QK1 by CDGM
Standard
Rare
Environmentally Friendly
H-QK1 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 1.47047 and a Vd of 66.876032. It has medium thermal expansion (CTE of 7.3×10⁻⁶/K), average chemical resistance, and high relative cost.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.47047 |
|---|---|
| Abbe Number (Vd) | 66.876032 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.302 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{0.841944\,\lambda^2}{\lambda^2 - 93.2639} + \frac{0.991785\,\lambda^2}{\lambda^2 - 0.0103999} + \frac{0.146213\,\lambda^2}{\lambda^2 - -0.00820301}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.39 \times 10^{-6} + 2(2.39 \times 10^{-8})\,\Delta T + 3(-3.11 \times 10^{-11})\,\Delta T^2 + \frac{3.4 \times 10^{-7} + 2(2.1 \times 10^{-10})\,\Delta T}{\lambda - 0.199}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Mechanical Properties
Chemical Resistance
| Climatic Resistance | 3 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| FC1 | Hoya | 1.470787 | 66.706713 | |
| FSL3 | Ohara | 1.464499 | 65.938855 | |
| FK3 | Schott | 1.4645 | 65.77 | |
| FC3 | Hoya | 1.464502 | 65.767612 | |
| A63-65 | Corning | 1.464501 | 65.763211 | |
| HOMOSIL | Heraeus | 1.458563 | 67.664757 | |
| HOQ | Heraeus | 1.458563 | 67.664757 | |
| INFRASIL | Heraeus | 1.458563 | 67.664757 | |
| HERASIL | Heraeus | 1.458563 | 67.664757 | |
| C79-80 | Corning | 1.458467 | 67.795012 |
Similar Glasses (CDGM)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-QK30GTI | CDGM | 1.48217 | 70.299764 | |
| H-K2 | CDGM | 1.50047 | 66.020774 | |
| D-QK3L-25 | CDGM | 1.48687 | 70.417086 | |
| H-QK3LGTI | CDGM | 1.48749 | 70.440487 | |
| D-QK3L | CDGM | 1.48749 | 70.440487 | |
| H-QK3L | CDGM | 1.48749 | 70.440487 | |
| H-K3 | CDGM | 1.50463 | 64.720718 | |
| H-K1 | CDGM | 1.49967 | 62.071979 | |
| H-K5 | CDGM | 1.510072 | 63.364525 | |
| D-K9GT-25 | CDGM | 1.51577 | 63.989637 |