IRG 27 exhibits excellent transmission through the short and mid-wave IR (SWIR-MWIR). The germanium-free composition offers various advantages, including a near zero dn/dT starting at 1.5 μm that continues through the MWIR and into the LWIR.
IRG 27 displays low dispersion for SWIR and MWIR applications and can be used as a flint material in achromatic doublets for multi-band IR applications.
The glass can be processed by conventional grinding and polishing methods, as well single point diamond turning, and molding. Based on similar thermal and mechanical characteristics to IRG 26, IRG 27 will be processed in a similar manner.
| 红外特性 | |
|---|---|
| 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 polished both sides |
| 表面平整度 | ≤ 5 waves P-V per surface at 632.8nm |
| 倒边 | Saftety bevel |
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SCHOTT
物品编号 |
玻璃类型
玻璃类型
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直径
直径（mm）
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厚度
厚度 (mm)
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重量
在不考虑公差的情况下，将大于一半的重量 (g) 四舍五入
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|---|
| 波长 [µm] |
透射率 (10 mm) |
透射率 (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 |
| 波长 [µm] |
透射率 (10 mm) |
透射率 (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 |
| 计算公式：折射率与波长及温度之间的函数关系 |
|---|
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| 波长 [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 |
| 波长 [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 |