Product type: Color Filter. Application: Lighting, Medical, Optical, Photography, Astronomy.
Overview
The Dia76mm Uncoated Optical Infrared Filter (RG850 IR Filter) is supplied as an optical filter made from Glass. Listed geometry: diameter 76.0+/-0.1mm, size Mitutoyo Vernier caliper, thickness 4.0+/-0.1mm, round shape. Supplied uncoated; surface quality 40-60; flatness 2L per inch at 633nm. Typical applications: 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 | Glass |
|---|---|
| Type | Color Filter |
| Shape | Round |
| Diameter | 76.0+/-0.1mm |
| Thickness | 4.0+/-0.1mm |
| Coating | uncoated |
| Surface quality | 40-60 |
| Flatness | 2L per inch at 633nm |
| Parallelism | <5arcmin |
| Clear aperture | >D72mm |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Thickness Range | 2mm-5mm |
| Color | Black |
| Principle | IR Filter |
| Angle of incidence | as Required |
| R1 | infinity |
| R2 | infinity |
| Chamfer | 0.5mmx45deg |
| Standard | MIL-PRF-13830B |
| Applications | . fluorescence microscopy |
| Inspection | Parameters |
| Dimensions | Mitutoyo Vernier caliper |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Items | Description | |
| IR Filter | Material: | Schott RG850 |
| Diameter: | 76.0+/-0.1mm | |
| Thickness: | 4.0+/-0.1mm | |
| R1: | infinity | |
| R2: | infinity | |
| Flatness: | 2L per inch at 633nm | |
| Surface quality: | 40-60 | |
| Parallelism: | <5arcmin | |
| Clear aperture: | >D72mm | |
| Chamfer: | 0.5mmx45deg | |
| Coating: | uncoated | |
| Standard: | MIL-PRF-13830B |
| Parameters | Inspection tools |
|---|---|
| Dimensions: | Mitutoyo Vernier caliper |
| Thickness: | Mitutoyo micrometer |
| Flatness: | ZYGO interferometer |
| Surface quality: | naked eye test& 15W LED cold light |
| Parallelism: | Thickness gauge |
| Chamfer: | magnifier X10& naked eye test |
What to specify when you request a quote
- Spectral target — 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 “as Required”; interference filters shift with angle, so specify the operating angle and cone.
- Size and thickness — listed as “76.0+/-0.1mm”; give outline, thickness and tolerance, and whether the filter is mounted.
- Substrate — listed as “Glass”; name the substrate glass if thermal or UV behaviour matters.
- Surface quality — listed as “40-60”; quote scratch-dig for imaging paths.
Engineering guides for this part
For material grades and coating options, see Color Filter Glass Materials for High-Performance Optical Screening and Imaging. How parts like this are machined and finished is covered in Chalcogenide Glass Coating for IR Optical Components. For an application example, read Infrared Window Glass for Smart Home Appliance Sensors. A related standard product is Optical Glass Colour Filter.
