4" transmission sphere, F/0.75, L/20
| Focal Length (mm) | 76.1 |
|---|---|
| Diameter (mm) | 66.7 |
| Length (mm) | 101.8 |
| Aperture Diameter | 4" |
| F-number (F/#) | 0.75 |
| Quality (PV) | Lambda/20 |
| Radius (mm) | 50 |
| Working Distance (mm) | 32.5 |
Knight Optical offers a comprehensive range of Kreischer Transmission Spheres, available in 4” and 6” apertures with a bayonet mount compatible with most interferometers. Our standard transmission spheres are polished to a precision of lambda/20 for 633nm Fizeau interferometers.
The innovative design of Kreischer Transmission Spheres allows for the measurement of an extended range, accommodating larger radii of curvature on convex surfaces compared to other transmission spheres on the market.
Currently, our 4” series is available in F-numbers from F/0.75 to F/3.3, and our 6” series is available in F-numbers from F/1.1 to F/2.4. Additional F-numbers can be provided upon request.
For further information or enquiries, please contact our technical sales team.
Please find the specifications for our 4-inch and 6-inch transmission spheres below. Please note all measurements are in mm.
| F-Number (F/No.) | R | D | WD | OD | L | EFL |
| 4" Transmission Sphere | ||||||
| F/0.75 - 04TSP07520 | 50 | 66.7 | 32.5 | 133.4 | 101.8 | 76.1 |
| F/1.0 - 04TSP1020 | 90 | 90 | 72.2 | 133.4 | 96.3 | 100.3 |
| F/1.5 - 04TSP1520 | 142.7 | 96.4 | 130 | 133.4 | 83.4 | 150.4 |
| F/3.3 - 04TSP3320 | 344.7 | 104.2 | 336 | 133.4 | 71.1 | 339.3 |
| 6" Transmission Sphere | ||||||
| F/1.1 - 06TSP1120 | 130.7 | 120.9 | 109 | 180.1 | 110.1 | 160.8 |
| F/2.4 - 06TSP2420 | 346.7 | 146.9 | 333 | 180.1 | 89.9 | 361.5 |
- R: Radius (of curvature) – the radius of the reference surface.
- D: Diameter – the diameter of the reference surface.
- WD: Working Distance – the distance from the focal point to the cell.
- OD: Outer Diameter – the outer diameter of the lens cell (housing).
- L: Length – the length the cell extends beyond the interferometer.
- EFL: Effective Focal Length
- Quality (PV) – the quality of the system, this is the surface figure of the reference surface, but it extends throughout the optical system.
Other F-number options are available in our 4-inch and 6-inch transmission sphere ranges. Please enquire with our technical sales team for further information.
As well as the listed transmission spheres and additional transmission spheres, we can also provide transmission spheres with the following:
- λ/10 quality to precision λ/40 quality
- Custom wavelengths, including 532nm, 1064nm, 1550nm, and 3.39µm.
Please enquire with our Technical Sales Team for further information and guidance on your specific requirements.