Request a quote Optical Filters
Custom optical filters for wavelength selection, attenuation, and detector protection.
Product Overview
Optical filters use an absorbing substrate, a thin-film coating, or a combination of both to control transmitted light.
They selectively transmit or attenuate light according to the specified filter design.
Substrate, dimensions, spectral response or optical density, angle of incidence, and coating requirements can be specified after the filter type is confirmed.
Applications
- Infrared Thermal Imaging: Selected infrared-transmitting materials serve as protective windows that allow infrared radiation to reach the detector.
- CO₂ Laser Systems: ZnSe windows transmit the laser beam while helping protect internal optics in cutting, engraving, and marking equipment.
- Spectroscopy: Optical filters select wavelength bands or suppress unwanted light to support spectral measurements.
- Machine Vision: Color or coated filters select illumination wavelengths and reduce unwanted background light to improve image contrast.
Typical Specifications
| Parameter | Standard Grade | Precision Grade |
|---|---|---|
| Materials | N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request | N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request |
| Dimensions | Ø3–300 mm or side length 3–300 mm | Ø3–300 mm or side length 3–300 mm |
| Diameter Tolerance | +0 / −0.10 mm | +0 / −0.02 mm |
| Length and Width Tolerance | ±0.10 mm | ±0.02 mm |
| Thickness Tolerance | ±0.10 mm | ±0.02 mm |
| Parallelism | ≤3′ | ≤2″ |
| Surface Figure (P–V) | ≤λ/4 @ 632.8 nm | ≤λ/10 @ 632.8 nm |
| Surface Quality (Scratch–Dig) | 40–20 | 20–10 |
| Surface Roughness (Ra) | ≤1.0 nm | ≤0.3 nm |
| Clear Aperture | ≥85% of overall dimensions | ≥90% of overall dimensions |
| Coating | AR / HR, etc., to customer requirements | AR / HR, etc., to customer requirements |
Other specifications, materials, and coatings are available upon request.