内部透过率（表格）| IR characteristics | |
|---|---|
| 成分 | As2S3 |
| 密度 | 3.20 g/cm3 |
| 热膨胀系数（20°C-100°C） | 22.5·10-6/K |
| 转变温度 | 197°C |
| 热变化 dn/dT (1 µm) | 15.6·10-6/K |
| 热变化 dn/dT (5 µm) | -3.2·10-6/K |
| 热变化 dn/dT (10 µm) | -3.7·10-6/K |
| 折射率（10um） | 2.3873 |
| 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 |
IRG 27在短波和中波IR（SWIR-MWIR）中表现出出色的透过率。无锗组分具有多种优势，包括从1.5μm开始到MWIR再进入LWIR波段，一直保持接近于零的dn / dT。内部透过率（图表）内部透过率（表格）
| Wavelength [µm] | Transmission (10 mm) | Transmission (2 mm) | Extinction [cm-1] |
|---|---|---|---|
| 0.6 | 5.8 | 56.5 | 2.853 |
| 0.7 | 93.3 | 98.6 | 0.070 |
| 0.8 | 95.7 | 99.1 | 0.044 |
| 1.0 | 97.2 | 99.4 | 0.028 |
| 1.5 | 98.7 | 99.7 | 0.013 |
| 2.0 | 99.0 | 99.8 | 0.010 |
| 2.5 | 99.1 | 99.8 | 0.009 |
| 3.0 | 98.5 | 99.7 | 0.015 |
| 3.5 | 98.9 | 99.8 | 0.011 |
| 4.0 | 87.1 | 97.3 | 0.138 |
| 4.5 | 99.2 | 99.8 | 0.008 |
| 5.0 | 99.5 | 99.9 | 0.005 |
| 5.5 | 99.5 | 99.9 | 0.005 |
| 6.0 | 99.2 | 99.8 | 0.008 |
| Wavelength [µm] | Transmission (10 mm) | Transmission (2 mm) | Extinction [cm-1] |
|---|---|---|---|
| 6.5 | 99.0 | 99.8 | 0.010 |
| 7.0 | 97.8 | 99.5 | 0.023 |
| 7.5 | 96.5 | 99.3 | 0.036 |
| 8.0 | 96.5 | 99.3 | 0.035 |
| 8.5 | 91.0 | 98.1 | 0.094 |
| 9.0 | 69.3 | 92.9 | 0.367 |
| 9.5 | 46.8 | 85.9 | 0.760 |
| 10.0 | 38.8 | 82.8 | 0.946 |
| 10.5 | 44.9 | 85.2 | 0.801 |
| 11.0 | 43.9 | 84.8 | 0.822 |
| 11.5 | 28.2 | 77.7 | 1.264 |
| 12.0 | 11.8 | 65.2 | 2.137 |
| 12.5 | 1.6 | 43.5 | 4.158 |
| 12.7 | 0.1 | 24.5 | 7.026 |
| 色散公示常数 | |
|---|---|
| B1 | 1.4005 |
| B2 | 3.4429 |
| B3 | 1.0394 |
| C1 | 0.0000 |
| C2 | 0.0871 |
| C3 | 805.5000 |
| D0 | -3.89·10-6 |
| E0 | 1.77·10-5 |
| λTK | 2.46·10-1 |
| 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 |
|---|---|---|
| 0.6 | 2.6347 | 62.2 |
| 0.7 | 2.5665 | 40.6 |
| 0.8 | 2.5268 | 28.4 |
| 0.8 | 2.5014 | 20.7 |
| 0.9 | 2.4841 | 15.6 |
| 1.0 | 2.4452 | 4.3 |
| 1.5 | 2.4320 | 0.6 |
| 2.0 | 2.4257 | -1.0 |
| 3.0 | 2.4218 | -1.9 |
| 4.0 | 2.4169 | -2.8 |
| 5.0 | 2.4129 | -3.2 |
| 6.0 | 2.4090 | -3.4 |
| 7.0 | 2.4046 | -3.5 |
| 8.0 | 2.3997 | -3.6 |
| 9.0 | 2.3939 | -3.6 |
| 10.0 | 2.3873 | -3.7 |
| 11.0 | 2.3795 | -3.7 |
| 12.0 | 2.3705 | -3.7 |
| Wavelength [µm] | 热变化 [dn/dt] |
|---|---|
| 1 µm | 15.6·10-6/K |
| 5 µm | -3.2·10-6/K |
| 10 µm | -3.7·10-6/K |
IRG 27在SWIR和MWIR应用中显示出低色散，并且可用作消色差双胶合透镜中的火石材料，用于多波段IR应用。
此外，IRG27可以通过常规的研磨和抛光方法以及单点金刚石车削和精密模压方式加工。基于与IRG 26类似的热和机械特性，IRG 27将以类似的方式进行处理。
