UV-silica concave lenses
Description
This range provides negative lenses for use down to 170nm in the UV, or for hostile environments requiring greater thermal, chemical or radiation resistance than ordinary glasses. UV fused silica also exhibits very low fluorescence.
AR-coated lenses are offered for improved UV transmittance.
|
Form |
planoconcave |
|
Diameter |
+0, -0.1mm |
|
Focal length |
±2% |
|
Scratch-dig |
|
|
Centration |
0.1mm (FL ≤ 40mm) |
|
Material |
UV silica See optical materials for details |
|
Coating (NU lenses) |
See below |
Spherical aberration calculation
To calculate the spherical aberration of a system and evaluate its effect proceed as follows.
1. Calculate element contributions
For each lens element work out the wavefront aberration A:
A = ky4/f3
where y is the semi-aperture, or maximum ray height at the element (from an on-axis object); f is the element focal length, and the coefficient k depends on material, shape and conjugates and is given in the relevant section of this catalogue.
2. Sum contributions
Simply add the contributions algebraically to give the total wavefront aberration ΣA (deviation from the best-fit sphere).
3. Evaluate effect
If ΣA is less than λ/4 the system is diffraction limited and aberration can usually be neglected. For larger aberration, the geometrical spot diameter D is given by:
D = 8 ΣAv/y
where y is as above, for the last element, and v is the distance from this element to the image.
For further detail request our Technical Note ‘Spherical aberration’.
• Mounting (all items)
• Special AR coating
• Edging to smaller diameters
For more details of your modification needs please enquire.
| Item code | Focal length (mm) | Diameter (mm) | Coating type | Back FL (mm) | Centre thickness (mm) | Edge thickness (mm) | Radius (mm) | Price per item (£ GBP) |
Stock available | Volume discount available |
Datasheets & customisation options |
Select amount |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 63 NU 25 | 63 | 25 | AR coated 248-400nm | 64 | 1.5 | 4.3 | 28.9 | £99.70 | ||||
| 100 NS 25 | 100 | 25 | Uncoated | 101 | 1.5 | 3.2 | 45.8 | £78.05 | ||||
| 16 NS 10 | 16 | 10 | Uncoated | 17 | 1.5 | 3.5 | 7.34 | £60.50 | ||||
| 25 NS 16 | 25 | 16 | Uncoated | 26 | 1.5 | 4.8 | 11.5 | £67.64 | ||||
| 40 NS 25 | 40 | 25 | Uncoated | 41 | 1.5 | 6.4 | 18.3 | £79.86 | ||||
| 63 NS 25 | 63 | 25 | Uncoated | 64 | 1.5 | 4.3 | 28.9 | £78.05 | ||||
| 10 NU 06 | 10 | 6.3 | AR coated 248-400nm | 11 | 1.5 | 2.8 | 4.58 | £80.22 | ||||
| 100 NU 25 | 100 | 25 | AR coated 248-400nm | 101 | 1.5 | 3.2 | 45.8 | £99.70 | ||||
| 16 NU 10 | 16 | 10 | AR coated 248-400nm | 17 | 1.5 | 3.5 | 7.34 | £77.20 | ||||
| 25 NU 16 | 25 | 16 | AR coated 248-400nm | 26 | 1.5 | 4.8 | 11.5 | £85.91 | ||||
| 40 NU 25 | 40 | 25 | AR coated 248-400nm | 41 | 1.5 | 6.4 | 18.3 | TBA | Send us a stock query | |||
| 10 NS 06 | 10 | 6.3 | Uncoated | 11 | 1.5 | 2.8 | 4.58 | £63.40 | ||||
For more information regarding stock availability icons, please see our shipping page.
