IRG 22在SWIR，MWIR和LWIR波段具有出色的透射率，并且在IRG系列中其NIR波段透射率最高，透射起始波长低至0.7μm。
低dn / dT和低色散等物理特性，使光学工程师可以设计出没有热散焦效应的颜色校正光学系统。
此外，IRG 22可以通过常规的研磨和抛光，单点金刚石车削或精密模压方式加工，以支持从小批量到大批量的零件制造。
| IR characteristics | |
|---|---|
| 成分 | Ge33As12Se55 |
| 密度 | 4.41 g/cm3 |
| 热膨胀系数（20°C-100°C） | 12.5·10-6/K |
| 转变温度 | 368°C |
| 热变化 dn/dT (1 µm) | 94.7·10-6/K |
| 热变化 dn/dT (5 µm) | 67.6·10-6/K |
| 热变化 dn/dT (10 µm) | 67.1·10-6/K |
| 折射率（10um） | 2.4968 |
| 表面质量 | 60/40双面抛光 |
| 表面平整度 | P-V ≤ 5个波长@632.8nm |
| 倒边 | 安全倒边 |
| Wavelength [µm] | Transmission (10 mm) | Transmission (2 mm) | Extinction [cm-1] |
|---|---|---|---|
| 0.8 | 52.2 | 87.8 | 0.650 |
| 1.0 | 91.4 | 98.2 | 0.090 |
| 1.5 | 96.7 | 99.3 | 0.034 |
| 2.0 | 97.5 | 99.5 | 0.026 |
| 2.5 | 97.5 | 99.5 | 0.025 |
| 3.0 | 98.3 | 99.7 | 0.017 |
| 3.5 | 98.5 | 99.7 | 0.015 |
| 4.0 | 98.7 | 99.7 | 0.013 |
| 4.5 | 96.3 | 99.3 | 0.037 |
| 5.0 | 97.0 | 99.4 | 0.031 |
| 5.5 | 99.5 | 99.9 | 0.005 |
| 6.0 | 99.7 | 99.9 | 0.003 |
| 6.5 | 99.7 | 99.9 | 0.003 |
| 7.0 | 99.7 | 99.9 | 0.003 |
| 7.5 | 99.2 | 99.8 | 0.008 |
| 8.0 | 95.2 | 99.0 | 0.049 |
| Wavelength [µm] | Transmission (10 mm) | Transmission (2 mm) | Extinction [cm-1] |
|---|---|---|---|
| 8.5 | 98.5 | 99.7 | 0.015 |
| 9.0 | 98.8 | 99.8 | 0.012 |
| 9.5 | 98.7 | 99.7 | 0.013 |
| 10.0 | 98.8 | 99.8 | 0.012 |
| 10.5 | 97.8 | 99.6 | 0.022 |
| 11.0 | 93.7 | 98.7 | 0.065 |
| 11.5 | 78.0 | 95.2 | 0.248 |
| 12.0 | 40.2 | 83.4 | 0.910 |
| 12.5 | 15.8 | 69.2 | 1.844 |
| 13.0 | 16.9 | 70.1 | 1.779 |
| 13.5 | 43.0 | 84.4 | 0.845 |
| 14.0 | 65.2 | 91.8 | 0.428 |
| 14.5 | 70.3 | 93.2 | 0.353 |
| 15.0 | 64.3 | 91.5 | 0.442 |
| 15.5 | 49.9 | 87.0 | 0.696 |
| 色散公示常数 | |
|---|---|
| B1 | 2.4834 |
| B2 | 2.8203 |
| B3 | 0.9773 |
| C1 | 0.0000 |
| C2 | 0.1352 |
| C3 | 1,420.7000 |
| D0 | 6.41·10-5 |
| E0 | 1.68·10-7 |
| λTK | 9.96·10-1 |
| Calculation Formula: Refractive index as a function of wavelength and temperature |
|---|
 |
| Wavelength [µm] | 折射率 (@ 22 °C) | Δn abs/ΔT [10–6/K] 22 °C |
|---|---|---|
| 1.0 | 2.5971 | 94.8 |
| 1.5 | 2.5462 | 69.1 |
| 2.0 | 2.5299 | 68.4 |
| 3.0 | 2.5182 | 68.0 |
| 4.0 | 2.5134 | 67.8 |
| 5.0 | 2.5104 | 67.7 |
| 6.0 | 2.5079 | 67.6 |
| 7.0 | 2.5054 | 67.5 |
| 8.0 | 2.5028 | 67.4 |
| 9.0 | 2.5000 | 67.3 |
| 10.0 | 2.4968 | 67.1 |
| 11.0 | 2.4933 | 67.0 |
| 12.0 | 2.4893 | 66.9 |
| Wavelength [µm] | 热变化 [dn/dt] |
|---|---|
| 1 µm | 94.7·10-6/K |
| 5 µm | 67.6·10-6/K |
| 10 µm | 67.1·10-6/K |