T-LA1270-AB - N-BK7 Plano-Convex Lens, Ø18 mm, f = 25 mm, AR Coating: 400 - 1100 nm
T-LA1270-AB - N-BK7 Plano-Convex Lens, Ø18 mm, f = 25 mm, AR Coating: 400 - 1100 nm
- Material: N-BK7
- AR-Coated for the 400 - 1100 nm Range
- Focal Lengths Available from 10 mm to 2500 mm
- Diameter 18.0 mm
- Focal Length (mm) 24.9
- Diopter +40.2
- Radius of Curvature (mm) 12.9
- Center Thickness (mm) 5.5
- Edge Thickness (mm) 1.8
- Back Focal Length (mm) 21.3
| Common Specifications | ||
|---|---|---|
| Lens Shape | Plano Convex | |
| Substrate Material | N-BK7 (Grade A) | |
| AR Coating Range | 400 - 1100 nm (-AB Coating) | |
|
Reflectance over Coating Range (Avg.) @ 0° AOI Per Surface |
<1.0% | |
| Diameters Available | Ø1/2", Ø1", and Ø2" | |
| Design Wavelength | 587.6 nm | |
| Index of Refraction @ 633 nm | 1.515 | |
| Surface Flatness (Plano Side) | λ/2 | |
|
Spherical Surface Power (Convex Side) |
3λ/2 | |
|
Surface Irregularity (Peak to Valley) |
λ/4 | |
| Surface Quality | 40-20 Scratch-Dig | |
| Thickness Tolerance | ±0.1 mm | |
| Diameter Tolerance | +0.0 / -0.1 mm | |
| Centration | <3 arcmin | |
| Damage Threshold | @532 nm | 7.5 J/cm2 (10 ns, 10 Hz, Ø0.456 mm) |
| @1064 nm | 7.5 J/cm2 (10 ns, 10 Hz, Ø0.407 mm) |
|
| Abbe Number | vd = 64.17 | |
| Clear Aperture | >90% of Diameter | |
| Focal Length Tolerance | ±1% | |