Longpass Filter
The GiAi longpass filter focuses on customized high-cut short-wave region and high-penetration long-wave region filters according to customer needs and combined with customer light sources. The wavelength range from ultraviolet to near-infrared can be selected arbitrarily, and the transition band slope of transmission and reflection is less than 20nm. Using high-quality quartz glass material, vacuum deposition hard film, the film can withstand the flame burning experiment.
They are commonly used in: laser photon beauty equipment, optical equipment, infrared imaging and other fields.
Product Code:GA-LP
Specification
| Process method |
IAD multilayer dielectric hard film |
| Peak transmittance | T>94% |
| Cut-off depth | OD2-OD4 |
| Cut-off transition band | <20nm |
| Working band | 200-1100nm |
| Product material | B270, D263T, quartz glass, sapphire |
| Round size range | Ø3mm~Ø110mm |
| Square size range | 2*2mm~146*146mm |
| Product thickness | 0.3-5.0mm |
| Clear aperture | coating coverage is greater than 95% effective area |
| Surface finish | US military standard 40-20 (scratches/pits) |
| Environmental test | MIL-STD-810F |
The longpass filter of the dielectric film is different from the colored filter glass. When the incident angle increases, the start wavelength and cut-off wavelength of these filters will shift to the short wave. Generally speaking, when the incident angle changes from 0° to 45°, the center wavelength will shift to the shorter by about 10%. This feature can be applied to applications that need to fine-tune the start or cut-off wavelength.
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Tags: Optical Filters
