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300-860nm long wavelength pass linear graduated filters
Long-wavelength pass linear gradient filters are continuously coated to achieve spatially continuous filtering characteristics based on a multilayer wedge-shaped film structure. The film slope can be adjusted according to the dispersion requirements to obtain the target linear rate of change. Linear gradient filters have highly integrated spectral capability, which is an irreplaceable advantage in the miniaturization and lightweight design of spectral instruments. They are widely used in lightweight hyperspectral imaging spectrometers, portable spectrometers, and medical endoscopes.
Product Performance
| typology | Long-wavelength pass linear graduated filters |
| Performance Parameters | |
| spectral range | 300-860nm |
| peak transmittance | ≥92% |
| linear rate of change | 21.5nm/mm |
| Out-of-band cutoff | ≥OD3 |
| Filtering method | Long-pass filtering, even gradation |
| Gradient method | Starts to taper at 13nm along the long side |
| Overall size | 38mm×10mm×1mm |
| Effective size of gradient area | 26mm×10mm×1mm |
spectral curve
Application Areas
1. Lightweight hyperspectral imager
2. Portable spectrometer
3. Medical endoscopes
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