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Bandpass Filters
UV-VIS-NIR
Custom Infrared Bandpass Filters
Bandpass filters isolate specific regions of the spectrum, simultaneously providing high transmission of desired energy, and deep rejection of unwanted energy. Available in wide or narrow bandwidths, they can be tailored to suit your specific requirements.
Andover can design and fabricate custom bandpass filters to suit your particular requirements. Every phase of the process is performed in-house, including thin-film coating design, mechanical design, substrate fabrication and polishing, coating, inspection, and environmental testing.
We can coat a variety of substrate materials, including Germanium, Sapphire, Silicon, Zinc Sulfide, and Zinc Selenide. Contact us for a quotation, whether it is for prototype quantities, or production quantities.
Typical IR Bandpass Filter |
Typical Out-of-Band Blocking |
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|
| Custom IR Bandpass Filter Specifications | |||||
Bandwidth (% of CW/L) |
W/L Range |
Transmission |
Blocking |
Substrate |
Part Numbers |
>10% |
2.4 µm - 5.0 µm | 70 - 80% |
0.3 to 40 µm |
Sapphire |
IRFC10-25 |
| 5.1 µm - 6.5 µm | 70 - 80% |
0.3 to 15 µm |
Germanium |
IRFC12-25 |
|
| 6.6 µm - 8.5 µm | 60 - 70% |
0.3 to 15 µm |
Germanium |
IRFC14-25 |
|
| 8.6 µm - 10.3 µm | 60 - 70% |
0.3 to 15 µm |
Germanium |
IRFC16-25 |
|
| 10.4 µm - 14.0 µm | 50 - 60% |
0.3 to 15 µm |
Germanium |
IRFC18-25 |
|
1.6 - 10.0% |
2.4 µm - 5.0 µm | 70 - 80% |
0.3 to 40 µm |
Sapphire |
IRFC20-25 |
| 5.1 µm - 6.5 µm | 70 - 80% |
0.3 to 15 µm |
Germanium |
IRFC22-25 |
|
| 6.6 µm - 8.5 µm | 60 - 70% |
0.3 to 15 µm |
Germanium |
IRFC24-25 |
|
| 8.6 µm - 10.3 µm | 50 - 60% |
0.3 to 15 µm |
Germanium |
IRFC26-25 |
|
| 10.4 µm - 14.0 µm | 40 - 60% |
0.3 to 15 µm |
Germanium |
IRFC28-25 |
|
1.0 - 1.5% |
2.4 µm - 5.0 µm | 50 - 80% |
0.3 to 40 µm |
Sapphire |
IRFC30-25 |
| 5.1 µm - 6.5 µm | 50 - 80% |
0.3 to 15 µm |
Germanium |
IRFC32-25 |
|
| 6.6 µm - 8.5 µm | 40 - 70% |
0.3 to 15 µm |
Germanium |
IRFC34-25 |
|
| 8.6 µm - 10.3 µm | 40 - 60% |
0.3 to 15 µm |
Germanium |
IRFC36-25 |
|
| 10.4 µm - 14.0 µm | 30 - 60% |
0.3 to 15 µm |
Germanium |
IRFC38-25 |
|
| Custom spectral and physical properties available uopn request | |||||
| General Specifications | |
|---|---|
| Diameter Tolerance: | +0/-.1mm |
| Minimum Clear Aperture: | 21mm |
| Center W/L tolerance: | ±0.05nm |
| Transmission (Ave): | 60 - 80% |
| Surface Quality: | 60/40 per MIL-C-48497A |
| Coating Quality: | 60/40 per MIL-C-48497A |
| 24-hour Humidity: | per MIL-C-48497A |
| Moderate Abrasion: | per MIL-C-48497A |
| Adhesion: | per MIL-C-48497A |