Product type: Concave Lens. Application: Lighting, Medical, Optical, Photography, Astronomy. Model: Doublet lens.
Overview
Dia25.4mm 490-570nm Ar Coated Optical Doublet Achromatic Lens: an optical lens made from Optical Glass. Listed geometry: diameter 25.40+0.00/-0.05mm, cemented shape. Optical / electrical data: transmittance 90%-95%. Coating: Anti-Reflection. 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 | Optical Glass |
|---|---|
| Type | Concave Lens |
| Shape | Cemented |
| Diameter | 25.40+0.00/-0.05mm |
| Transmittance | 90%-95% |
| Coating | Anti-Reflection |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Model NO. | Doublet lens |
| Lenses Color | Clear |
| Specifications | Items |
| Center thickness | 9.4+/-0.1mm |
| S1 SAG | 3.204+/-0.025mm |
| S2 SAG | 1.872+/-0.025mm |
| R1 | 14.384mm+/-0.1%,CC |
| R2=R3 | 40.691mm+/-0.1%,Doublet |
| R4 | 21.789mm+/-0.1%,CX |
| Centerness | <4arcmin |
| S1&S2 | ETV<0.02mm |
| S1 | >D18.1mm |
| S2 | >D24.4mm |
| S3&S4 | >D24.0mm |
| Chamfer | <0.2mm(FW)x45deg |
| Tavg>99%@490-570nm,AOI | 0deg |
| Standard | MIL-PRF-13830B |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Items | Description | |
| Doublet Lens | Material: | Schott N-SF6 |
| Schott N-LASF44 | ||
| Diameter: | 25.40+0.00/-0.05mm | |
| 24.40+0.00/-0.05mm | ||
| Center thickness: | 9.4+/-0.1mm | |
| S1 SAG: | 3.204+/-0.025mm | |
| S2 SAG: | 1.872+/-0.025mm | |
| R1: | 14.384mm+/-0.1%,CC | |
| R2=R3: | 40.691mm+/-0.1%,Doublet | |
| R4: | 21.789mm+/-0.1%,CX | |
| Surface quality: | S1&S2&S3&S4:80-60 | |
| Centerness: | <4arcmin | |
| S1&S2:ETV<0.02mm | ||
| Clear aperture: | S1:>D18.1mm | |
| S2:>D24.4mm | ||
| S3&S4:>D24.0mm | ||
| Chamfer: | <0.2mm(FW)x45deg | |
| Standard: | MIL-PRF-13830B |
What to specify when you request a quote
- Material — listed as “Optical Glass”; name the glass or crystal.
- Geometry — listed as “25.40+0.00/-0.05mm”; give diameter, focal length or radii, angles and tolerances.
- Surface figure — quote surface figure (λ) and scratch-dig.
- Centring and edges — listed as “<0.2mm(FW)x45deg”; state centration and edge chamfer.
- Coating — listed as “Anti-Reflection”; list the band and reflectance or transmission target.
Engineering guides for this part
For material grades and coating options, see AR-Coated Glass Materials for High-Transmission Optical Parts. How parts like this are machined and finished is covered in Flat Glass Polishing Process for Precision Substrates. For an application example, read AR Coated Glass for Appliance Touch Screens: Specs and Selection. Before sending a drawing, check Fused Silica Refractive Index: Key to Optical Design Improvement. A related standard product is AR-Coated High-Transparency Optical Glass.
