The bandpass filter is an optical component that allows only a specific range of wavelengths to pass through while blocking or reflecting all other light outside this range. It is manufactured primarily through hard coating or soft coating techniques, where multiple layers of precise dielectric films are deposited onto an optical substrate. This structure enables accurate spectral selection based on the principle of optical interference.
Excellent signal-to-noise ratio: Effectively isolates the optical signals within the target wavelength band.
Outstanding spectral selectivity.
Angular sensitivity: Requires strict control of the light's angle of incidence during use.
| Material | Optical glass, Borofloat |
| Diameter Tolerance | +0.0,-0.1 mm |
| Thickness Tolerance | +0.0,-0.1 mm |
| CWL Tolerance | ±2nm |
| FWHM Tolerance | ±2nm |
| Blocking | ≥OD3 |
| Surface Quality | 80-50, 60-40 S/D |
