The KPX040 BK7 Precision Plano-Convex Lens is an uncoated, 1/2 inch (12.7 mm) diameter BK 7 plano-convex lens with an effective focal length of 19.0 mm. It has ≤ λ/4 surface irregularity, 40-20 scratch-dig, and is designed to meet the demanding requirements of laser electro-optic applications. It is manufactured from fine annealed optical glass and polished to tight tolerances using master test plates ensures minimum wavefront distortion. Tight surface quality tolerances minimize scatter and unwanted diffraction effects. BK 7 is an excellent material for most visible and near infrared applications. It is the most common optical glass, and it provides great performance at a good value.
| Model | KPX040 |
|---|---|
| Lens Type | Spherical |
| Lens Shape | Plano-Convex |
| Effective Focal Length | 19.0 mm |
| Diameter | 0.50 in. (12.7 mm) |
| Antireflection Coating | Uncoated |
| Lens Material | Grade A BK 7 |
| Center Thickness (Tc) Tolerance | ±0.1 mm |
| f/# | 1.5 |
| Surface Quality | 40-20 scratch-dig |
| Wavelength Range | 380 to 2100 nm |
| Diameter Tolerance | +0/-0.1 mm |
| Te | 3.0 mm |
| Edge Thickness (Te) Tolerance | 3.0 mm, nominal |
| Focal length tolerance | ±1 % |
| BFL | 15.48 mm |
| FFL | 19.00 mm |
| Radius of Curvature | 9.819 mm |
| P2 | -3.51 mm |
| Clear Aperture | ≥central 90% of diameter |
| Centration, Spherical Lenses | ≤3 arc min |
| Surface Accuracy, Power (lambda) | 1.5 λ |
| Chamfers | 0–0.8 mm face width |
| Chamfers Angle/Tolerance | 45° ±15°, typical |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
