IRG 27

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.

IRG 27
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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技术规格
内部透过率(图表)
内部透过率(表格)
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
材料数据
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
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