Dichroic Longpass Filters
Dichroic Longpass Filters transmit light with wavelengths longer than the cutoff wavelength. Made of optical-grade float glass, these dichroic filters are widely used in fluorescence excitation spectral analysis, beam splitting and beam combining. The average reflectance of the reflection band is over 98%. All dichroic beam splitter filters are designed for a 45° angle of incidence. The filters feature low polarization dependence, broad spectral ranges.
Parameters
| Material: H-K9L (CDGM) | TWE: λ/4@633 nm |
| Parallelism: < 30″ | Surface Quality: 60/40 |
| Dimension Tolerance: + 0.0/ -0.2 mm | Thickness: 2 ± 0.2 mm |
| Central Wavelength Tolerance: ± 10 nm | Transmission**: Tavg > 90% |
| Reflection**: Ravg > 98% | Clear aperture: > 90% |
| AOI: 45° | Central wavelength(λC): The wavelength with transmission = 50% Tmax |
**The incident light is in random polarization.
Model
| Diameter(mm) | CWL | Reflective band | Transmission band |
| Φ12.50/Φ25.00 | 425nm | 370~400nm | 440~1200nm |
| 450nm | 370~430nm | 465~1200nm | |
| 500nm | 370~480nm | 515~1200nm | |
| 550nm | 385~520nm | 565~1200nm | |
| 600nm | 460~570nm | 620~1200nm | |
| 650nm | 495~615nm | 670~1200nm | |
| 700nm | 535~665nm | 720~1200nm | |
| 750nm | 565~715nm | 770~1200nm | |
| 800nm | 600~760nm | 820~1200nm | |
| 850nm | 635~810nm | 870~1200nm | |
| 12.50 x 17.50/ 25.00 x 36.00 | 425nm | 370~400nm | 440~1200nm |
| 450nm | 370~430nm | 465~1200nm | |
| 500nm | 370~480nm | 515~1200nm | |
| 550nm | 385~520nm | 565~1200nm | |
| 600nm | 460~570nm | 620~1200nm | |
| 650nm | 495~615nm | 670~1200nm | |
| 700nm | 535~665nm | 720~1200nm | |
| 750nm | 565~715nm | 770~1200nm | |
| 800nm | 600~760nm | 820~1200nm | |
| 850nm | 635~810nm | 870~1200nm |