Product type: Optical Bandpass Filter. Application: Lighting, Medical, Optical, Photography, Astronomy.
Overview
25.4mm 905nm Coated Optical Bandpass Filter is a bandpass filter made from Schott Rg850. Listed geometry: diameter 25.4+0/-0.2mm, thickness 2.0+/-0.2mm, round shape. Optical / electrical data: wavelength 905+/-5nm, bandwidth 65+/-2nm. Surface quality 60-40. It is used in Lighting, Medical, Optical, Photography and Astronomy. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Schott Rg850 |
|---|---|
| Type | Optical Bandpass Filter |
| Shape | Round |
| Diameter | 25.4+0/-0.2mm |
| Thickness | 2.0+/-0.2mm |
| CWL | 905+/-5nm |
| FWHM | 65+/-2nm |
| Surface quality | 60-40 |
| Parallelism | <3arcmin |
| Clear aperture | >90% |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Thickness Range | 2mm-5mm |
| Color | Black |
| Principle | Bandpass Filter |
| Angle of incidence | 0° |
| R1 | infinity |
| R2 | infinity |
| Chamfer | protected |
| Band pass filter coating,AOI | 0deg |
| Standard | MIL-PRF-13830B |
| Applications | . fluorescence microscopy |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Material: | Schott RG850 |
|---|---|
| Diameter: | 25.4+0/-0.2mm |
| Thickness: | 2.0+/-0.2mm |
| R1: | infinity |
| R2: | infinity |
| Flatness: | N/A |
| Surface quality: | 60-40 |
| Clear aperture: | >90% |
| Parallelism: | <3arcmin |
| Chamfer: | protected |
| Coating: | Band pass filter coating,AOI:0deg |
| Tmin>90% | |
| CWL:905+/-5nm | |
| FWHM:65+/-2nm | |
| Standard: | MIL-PRF-13830B |
What to specify when you request a quote
- Spectral target — listed as “905+/-5nm”; state the centre or edge wavelength, the bandwidth and the minimum transmission in the passband.
- Blocking — give the blocking range and optical density (OD) the system needs.
- Angle of incidence — listed as “0°”; interference filters shift with angle, so specify the operating angle and cone.
- Size and thickness — listed as “25.4+0/-0.2mm”; give outline, thickness and tolerance, and whether the filter is mounted.
- Substrate — listed as “Schott Rg850”; name the substrate glass if thermal or UV behaviour matters.
- Surface quality — listed as “60-40”; quote scratch-dig for imaging paths.
Engineering guides for this part
For material grades and coating options, see Selecting Bandpass Filter Glass for Reliable Optical Performance. For an application example, read Bandpass Filter Glass for Appliance Light Detection Modules. A related standard product is Bandpass Filter.
