A long-wave pass (LWP) filter is an optical filter that blocks short wavelengths while transmitting longer ones. Fosco’s LWP filters feature precise wavelength control, high transmission efficiency, deep blocking in the rejection band, and robust, durable coatings—enabling tailored optical filtering solutions.
These filters are widely used in hair removal devices, biometric systems, detectors, sensors, spectrometers, microscopes, fluorescence analyzers, and machine vision inspection systems. Typical applications include fluorescence excitation spectroscopy, Raman spectroscopy, spectral sorting, and astronomical observation.
| Cut-on Wavelength | 325-1300nm |
| Spectral Blocking Range | 200-1650nm |
| Optical Density (OD) | OD3; OD4; OD5; OD6 |
| Dimensional Tolerance | 0.5-600±0.02mm |
| Clear Aperture | ≥90% |
| Thickness Tolerance | 0.3-50±0.02mm |
| Surface Flatness | 1/10λ |
| Surface Quality | 10-5 |
| Edge Bevel | 45°×0.2mm |
| Coating Type | Hard-coated |
