Knight Optical - Model 320FCS2500 -320nm Bandpass Colour Glass Filter
These fire-polished aspheric lenses are glass lenses manufactured by a simple moulding process and polished by heating just enough to melt the surface and allow surface tension to smooth out defects. Usually these lenses have a very large diameter compared with the focal length. Fire polished aspheric lenses have large apertures so are ideal for light collecting applicatons such as condenser lenses in LED based projectors. The second face of the plano-convex type is optically polished for improved quality. Knight Optical stock a full range of both thermally toughened aspheric lenses and un-toughened fire polished aspheric lenses. For higher quality applications we also sell uncoated and AR coated precision aspherics available to purchase directly from this site.
- Diameter (mm): 25
- Thickness (mm): 3
- Type: Bandpass
- Colour: Black- UV transmitting
- CWL (nm): 320
- Equivalent material: UG5
- Mounted/Unmounted: Unmounted
- Wavelength cut-off (nm): 390
- Wavelength cut-on (nm): 245
The filters listed here are of the band-pass type and have uniform spectral transmission properties over their entire aperture. A wide range of band-pass filters are available with circular filters of 25mm diameter and square 50x50mm filters. These filters are primarily used in applications such as agriculture analysis, medical analysers and fluorescence applications.
Colour glass filters also have high transmissions at selected wavelengths therefore ideal where the angle of incidence of the incident light cannot be tightly controlled.
- Material: Colour glass
- Diameter: +0/-0.20 mm
- Length/Width: ±0.20 mm
- Thickness: ±0.20 mm
- Surface Quality:
- Parallelism:
Note:
- Wavelength cut-on listed in table is transition cut-on wavelength (T=Tmax/2)
- Wavelength cut-off listed in table is transition cut-off wavelength (T=Tmax/2)
- Wavelength peak is centre wavelength