IRG 26在SWIR，MWIR和LWIR波段具有出色的透过率。 IRG 26的硫系化合物成分中不含锗（Ge），因此可以提供IRG系列中最宽的透射波段和12.5μm处最小的吸收。
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 26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 | As40Se60 |
| 密度 | 4.63 g/cm3 |
| 热膨胀系数（20°C-100°C） | 21.4·10-6/K |
| 转变温度 | 185°C |
| 热变化 dn/dT (1 µm) | 76.1·10-6/K |
| 热变化 dn/dT (5 µm) | 33.4·10-6/K |
| 热变化 dn/dT (10 µm) | 32.1·10-6/K |
| 折射率（10um） | 2.7781 |
| 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] |
|---|---|---|---|
| 1.0 | 81.6 | 96.0 | 0.203 |
| 1.5 | 95.7 | 99.1 | 0.044 |
| 2.0 | 96.2 | 99.2 | 0.039 |
| 2.5 | 96.3 | 99.2 | 0.038 |
| 3.0 | 96.5 | 99.3 | 0.036 |
| 3.5 | 97.5 | 99.5 | 0.025 |
| 4.0 | 98.0 | 99.6 | 0.020 |
| 4.5 | 95.6 | 99.1 | 0.045 |
| 5.0 | 95.6 | 99.1 | 0.045 |
| 5.5 | 98.8 | 99.8 | 0.012 |
| 6.0 | 99.0 | 99.8 | 0.010 |
| 6.5 | 98.9 | 99.8 | 0.011 |
| 7.0 | 99.1 | 99.8 | 0.009 |
| 7.5 | 98.7 | 99.7 | 0.013 |
| 8.0 | 96.1 | 99.2 | 0.040 |
| Wavelength [µm] | Transmission (10 mm) | Transmission (2 mm) | Extinction [cm-1] |
|---|---|---|---|
| 8.5 | 98.1 | 99.6 | 0.019 |
| 9.0 | 97.9 | 99.6 | 0.021 |
| 9.5 | 98.0 | 99.6 | 0.020 |
| 10.0 | 98.2 | 99.6 | 0.018 |
| 10.5 | 96.9 | 99.4 | 0.031 |
| 11.0 | 93.8 | 98.7 | 0.064 |
| 11.5 | 85.0 | 96.8 | 0.163 |
| 12.0 | 60.1 | 90.3 | 0.509 |
| 12.5 | 31.1 | 79.2 | 1.167 |
| 13.0 | 31.1 | 79.2 | 1.167 |
| 13.5 | 52.0 | 87.7 | 0.654 |
| 14.0 | 69.7 | 93.0 | 0.361 |
| 14.5 | 71.8 | 93.6 | 0.332 |
| 15.0 | 63.1 | 91.2 | 0.461 |
| 15.5 | 47.2 | 86.0 | 0.752 |
| 色散公示常数 | |
|---|---|
| B1 | 3.1934 |
| B2 | 3.5854 |
| B3 | 2.2337 |
| C1 | 0.0000 |
| C2 | 0.1852 |
| C3 | 3,398.0804 |
| D0 | 2.63·10-5 |
| E0 | 2.93·10-5 |
| λTK | 3.15·10-1 |
| 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 |
|---|---|---|
| 0.8 | 3.0026 | 0.0 |
| 1.0 | 2.9316 | 76.2 |
| 1.5 | 2.8460 | 49.8 |
| 2.0 | 2.8197 | 41.7 |
| 3.0 | 2.8015 | 36.2 |
| 4.0 | 2.7947 | 34.3 |
| 5.0 | 2.7909 | 33.4 |
| 6.0 | 2.7882 | 33.0 |
| 7.0 | 2.7857 | 32.7 |
| 8.0 | 2.7833 | 32.5 |
| 9.0 | 2.7808 | 32.3 |
| 10.0 | 2.7781 | 32.2 |
| 11.0 | 2.7753 | 32.1 |
| 12.0 | 2.7722 | 32.0 |
| Wavelength [µm] | 热变化 [dn/dt] |
|---|---|
| 1 µm | 76.1·10-6/K |
| 5 µm | 33.4·10-6/K |
| 10 µm | 32.1·10-6/K |
