Measured focal lengths of the fabricated lens arrays with different processing parameters. The radius of curvature has two values: “Design,” indicating the value of the first lens prototype in the CAD design, and “Estimated,” which refers to the value of the final lens obtained from the measured focal length, assuming a refractive index of 1.55.
| Lens number | Lens prototype | Radius of curvature (mm) | Thickness of the plastic sheet used for vacuum forming (mm) | Focal length (mm) | |
|---|---|---|---|---|---|
| Design (first prototype) | Estimated (final lens) | ||||
| 1 | a | 2.69 | 2.4 | 0.6 | 4.0 |
| 2 | a | 2.69 | 2.9 | 1.0 | 5.0 |
| 3 | b | 3.63 | 4.5 | 0.6 | 8.0 |
| 4 | b | 3.63 | 5.2 | 1.0 | 9.3 |
| 5 | c | 3.63 | 3.7 | 1.0 | 6.5 |
| 6 | d | 6.63 | 6.0 | 1.0 | 10.7 |