| |
Item |
Specifications |
Notes |
| Optical |
Transmittance |
89% Minimum |
380-2000 nm Wavelength range |
| Polarization Preservation |
0.99 |
None-stressed state |
| Maximum Pitch |
0.75P |
Lens length Z=2pP/ÖA
|
| Lense Effective Diameter |
Approx. 60-70% lens Dia. |
For low loss and low aberration |
| Index Gradient Constant |
±0.75% Max. |
Within same ion exchange batch |
| ÖA Tolerance |
±2.5% Max. |
Between ion exchange batches |
| Mechanical |
Lens Diameter Tolerance |
+0.005/-0.010 mm |
For all SML's except SLW-3.0 & 4.0 |
| |
+0/-0.02mm |
For SLW-3.0 & SLW-4.0 |
| Lens Length (Z) |
2.5% of nominal length |
Adjust According to ÖA variation |
| Tolerance |
±0.04mm (vs. Calculations) |
Machining and polishing tolerance |
| Minimum Lens |
1.0mm for non-coated lens |
|
| Length |
2.3mm for AR coated lens |
|
| Facet Perpendicularity |
6 mrad max |
|
| Ellipticity |
3mm |
Dmax — Dmin |
| Glass Material |
Oxide Glass |
|
| Young's Modulus |
6,000 — 8,000 Kgf/mm2 |
Typical |
| Thermal Expansion Coeff. |
10X10-6/oC |
Typical |
| Other |
Temperature |
350 oC |
Max. operating temp.for lens material |
| Humidity |
(will react with non-coated) |
Store in desiccant to avoid moisture |
| Radiation |
(varies by dose and wavelength) |
Contact NSG for reference data |
| Surface Quality Inspected at 20X mag. |
|
Defects greater than 30mm in diameter are not allowed |
| Pinholes/Particles |
Defects smaller than 10mm in diameter are allowed |
| |
Up to three defects with diameter between 10mm and 30mm are allowed |
| |
Scratches wider than 5mm are not allowed |
| Scratches |
Scratches narrower than 2mm are allowed |
| |
Up to three scratches with 5mm max width and 200mm max length are allowed |
| Chips |
Chips are not allowed within the concentric area of 90% of the lens diameter |
