Basic Specification of Grin Lens
| Item | Name | Parameter | Remark | |
| Optical | Transmittance | β | ≥ 89% | Wavelength 380 ~ 2000nm |
| Max. Pitch | P | 0.75P | (Length)Z=2πP/gena | |
| Effective diameter | d | Lens diameter 60~70% | ||
| √A Tolerance | ±0.75% | In same ion exchange batch | ||
| ±2.5% | For different ion exchange batches | |||
| Physics | Diameter tolerance | + 0.005/-0.010mm | ||
| Length tolerance | + 0/-0.04mm | Max. mechanical & polishing tolerance | ||
| 2.5% general length | Adjusted according to √A variation | |||
| Face angle | 0°, 2°, 4°, 6°, 8° | |||
| Ellipticity | 3 μm | Dmax – Dmin | ||
| End face verticality | 6mrad max. | |||
| Thermal expansion coefficient | 10×10 -6/℃ | |||
| Other | Temperature | 350℃ | Max. temp. of operation | |
| Humidity | Store in desiccant | |||
|
Surface quality |
Pinholes / particles | Defects larger than 30 μm in diameter are not allowed. | ||
| Defects smaller than 10 μm in diameter are allowed. | ||||
| Up to defects with diameter between 10 μm to 30 μm are allowed. | ||||
| Scratches | Scratches wider than 5 μm are not allowed. | |||
| Scratches narrower than 2 μm are allowed. | ||||
| Up to the scratches with 5 μm Max. width and 200 μm Max. length are allowed. | ||||
| Chips | Chips are not allowed within the concentric area of 90% of the lens diameter. | |||
Parameters of Numerical Aperture
|
Numerical Aperture |
Diameter | Pitch | Wavelength (nm) |
| 0.46 | 1.0mm | 0.23, 0.25 | 630780
830 1310 1550 1250~1650 |
| 1.8mm |
0.14, 0.18, 0.23 0.24, 0.25, 0.35 |
||
| 3.0mm | 0.11, 0.20 | ||
| 0.60 | 1.8mm | 0.22, 0.29 |
Parameters of Refractive Index and Index Gradient Constant
|
Wavelength (nm) |
Type | R | H | ||
| N.A. (2θ) | 0.46 (55°) | 0.60 (74°) | |||
| Diameter | Φ1.0mm | Φ1.8mm | Φ3.0mm | Φ1.8mm | |
| 630 | No | 1.611 | 1.658 | ||
|
√A |
0.606 | 0.339 | 0.207 | 0.420 | |
| Z (0.25P) | 2.59 | 4.63 | 7.59 | 3.74 | |
| 830 | No | 1.601 | 1.646 | ||
| √A | 0.599 | 0.332 | 0.203 | 0.413 | |
| Z (0.25P) | 2.62 | 4.73 | 7.73 | 3.80 | |
| 1310 | No | 1.594 | 1.638 | ||
| √A | 0.597 | 0.330 | 0.199 | 0.406 | |
| Z (0.25P) | 2.64 | 4.76 | 7.89 | 3.87 | |
| 1550 | No | 1.591 | 1.634 | ||
| √A | 0.571 | 0.327 | 0.198 | 0.404 | |
| Z (0.25P) | 2.75 | 4.78 | 7.93 | 3.89 | |