Bandpass Infrared Filters
Notch Optics’s bandpass infrared filters (multi-band & single-band) offer superior in-band transmission in both the MWIR (mid-wave, 3-5 µm range) and LWIR (long-wave, 7.5-13.5 µm range) spectrums, coupled with excellent out-of-band rejection. We have achieved in-band transmission levels exceeding 90% across various substrate materials with diverse wavelengths and transmission specifications.
From custom multi-band and single-band bandpass filter prototypes to large-scale production, we provide tailored solutions to meet your needs.
Bandpass filters allow a specific wavelength range to pass and attenuate wavelengths outside of that range. Notch Optics offers both ultra-narrow (<2 nm) and ultra-broad (>50 nm) bandpass filters.
Reach out to us with your specific optical coating requirements today!
Typical Specification
| Dimension | 4 mm ~ 80 mm, round or square |
| Center Wavelength (CWL) | 340 nm ~ 1570 nm |
| Full Width at Half Maximum (FWHM) | 0.3% ~ 0.6% of CWL |
| Transmission at CWL | >70% (Or Custom Design) |
| Cut-off Wavelength | UV – NIR |
| Blocking | >OD4 or OD6 |
| Slope (T=1% to T=90%) | 80/50 |
Bandpass Filter Applications
Multi-Bandpass Filter Specifications
| Material: | N-BK7, Germanium (Ge), Fused Silica, Silicon (Si), ZnSe, and others |
| Wavelength Band: | 3.0 µm to 5.0 µm 7.5 µm to 13.5 µm |
| Surface: | Plano, Convex, Concave, and Polished edges/ chamfers are available |
| Environmental: | MIL-C-48497A 3.4.1.1 – Adhesion 3.4.1.2 – Humidity 3.4.1.3 – Abrasion (moderate) 3.4.2.1 – Temperature Cryogenic Cycling to 80K |
