The KBX025 BK 7 Bi-Convex Lens is an uncoated, 1/2 inch (12.7 mm) diameter, BK 7 bi-convex lens with an effective focal length of 19.0 mm. It is designed to meet the demanding requirements of laser electro-optic applications. Newport's BK 7 precision bi-convex lenses are manufactured from fine annealed optical glass and are polished to tight tolerances using master test plates to ensure minimum wavefront distortion.
| Model | KBX025 |
|---|---|
| Lens Type | Spherical |
| Lens Shape | Bi-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/# | 1.4 |
| 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 | Nominal Value |
| Focal length tolerance | ±1 % |
| BFL | 17.19 mm |
| FFL | 17.19 mm |
| Radius of Curvature | 18.705 mm |
| P1 | 1.80 mm |
| P2 | -1.80 mm |
| Clear Aperture | ≥central 90% of diameter |
| Centration, Spherical Lenses | ≤3 arc min |
| Surface Accuracy, Irregularity (lambda) | λ/4 |
| 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 |
