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Thorlabs的中远红外带通滤光片提供了一种最简单的方法来透射特定波长的光，同时阻隔不需要的光。它们在本质上是一种由真空镀膜技术构成的薄膜法布里-玻罗干涉仪，这种干涉仪含有两个反射面，由一层偶数阶的隔离层隔开。这些反射表面是由高低折射率材料层交替排布构成的，反射率超过99.99%。通过改变隔离层的厚度和/或反射材料层的数量，就可以改变滤光片的中心波长和带宽。中远红外滤光片常用于气体检测，如1.90 µm(H2O)、3.33 µm(CH4)、4.26 µm(CO2)、5.068 µm(H2O)或5.33 µm(NO)的气体吸收线。这些滤光片的透过带较窄，透过峰值尖锐。
型号
中心波长（nm)
中心波长（um)
半带宽
透过率
除通带外阻断区域
红外滤光片基底
FB1750-500
1750nm ± 50 nm
1.75 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
N-BK7
FB1900-200
1900nm ± 28 nm
1.90 µm ± 28 nm
200 ± 40 nm
>85%
0.2 - 12 µmb
UV Fused Silica
FB2000-500
2000nm± 50 nm
2.00 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
N-BK7
FB2250-500
2250nm ± 50 nm
2.25 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB3250-500
3250nm ± 50 nm
3.25 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB3330-150
3330nm± 17 nm
3.33 µm ± 17 nm
150 ± 15 nm
>70%
0.2 - 12 µmb
Fused Silica
FB3500-500
3500nm ± 50 nm
3.50 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB3750-500
3750nm ± 50 nm
3.75 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB4000-500
4000nm± 50 nm
4.00 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB4250-500
4250nm ± 50 nm
4.25 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB4260-105
4260nm ± 22 nm
4.26 µm ± 22 nm
105 ± 10 nm
>70%
0.2 - 12 µmb
Sapphire
FB4500-500
4500nm ± 50 nm
4.50 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB4750-500
4750nm± 50 nm
4.75 µm ± 50 nm
500 ± 100 nm
70% (Min)
0.2 - 12 µmb
Sapphire
FB5000-500
5000nm± 50 nm
5.00 µm ± 50 nm
500 ± 100 nm
70% (Min)
1.8 - 9.5 µmd
Ge
FB5068-100
5068nm ± 26 nm
5.068 µm ± 26 nm
100 ± 15 nm
>70%
0.2 - 12 µmb
Sapphire
FB5330-250
5330nm ± 27 nm
5.33 µm ± 27 nm
250 ± 50 nm
>70%
0.2 - 12 µmb
Sapphire
FB5500-500
5500nm ± 50 nm
5.50 µm ± 50 nm
500 ± 100 nm
70% (Min)
1.8 - 9.5 µmd
Ge
FB5750-500
5750nm ± 50 nm
5.75 µm ± 50 nm
500 ± 100 nm
70% (Min)
1.8 - 9.5 µmd
Ge
FB6000-500
6000nm ± 50 nm
6.00 µm ± 50 nm
500 ± 100 nm
70% (Min)
1.8 - 9.5 µmd
Ge
FB6500-500
6500nm ± 50 nm
6.50 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB7000-500
7000nm ± 50 nm
7.00 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Ge
FB7500-500
7500nm ± 50 nm
7.50 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB8000-500
8000nm± 50 nm
8.00 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB8500-500
8500nm± 50 nm
8.50 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB9000-500
9000nm ± 50 nm
9.00 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB9500-500
9500nm± 50 nm
9.50 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB10000-500
10000nm ± 50 nm
10.00 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB10500-500
10500nm ± 50 nm
10.50 µm ± 50 nm
500 ± 100 nm
>70%
0.2 - 16 µm
Si
FB11000-500
11000nm ± 50 nm
11.00 µm ± 50 nm
500 ± 100 nm
>60%
0.2 - 16 µm
Si
FB11500-500
11500nm± 50 nm
11.50 µm ± 50 nm
500 ± 100 nm
>60%
0.2 - 16 µm
Si
FB12000-500
12000nm± 50 nm
12.00 µm ± 50 nm
500 ± 100 nm
>60%
0.2 - 16 µm
Si
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