Custom-Made Lenses
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Dual-focus lens
Dual-focus lenses (DFL) are a revolutionary new type of lens for CO2 laser cutting.
DFL are intended to be used as a direct replacement for conventional lenses in some industrial laser systems and applications. The basic principal of the lenses coming from their title lies in existence of a couple of focal points. Complex design of these lenses allows to distribute an incident laser energy and deliver its calculated fraction into a secondary (lower) focus.
Especially designed to assist in a range of thick-section cutting jobs such lenses give the followings advantages: 
- processing of increased thicknesses at a given power
- increased process speed
- improved kerf quality
- elimination of upper and lower surface dross
- immediate cut-initiation
- reduced assist-gas usage
- improved process control
Tydex proposed and has been using a novel approach in fabrication of DFL, which in particular did allow us to create DFL of cylindrical shape.
A specification below presents standard product. Custom-made sizes and specifications are available as well. Non-standard lenses can be designed and proposed upon certain RFQ.
Specifications:
| 1. | Type of a part: | cylindrical dual-focus lens |
| 2. | Material: | CVD-ZnSe |
| 3. | Overall dimensions, mm: | 25.4 (+0/-0.25) x 25.4 (+0/-0.25) |
| 4. | Thickness, mm: | 4.0 (+0.5/-0.0) |
| 5. | Radii of curvature: | the values depend on required combination of EFL |
| 6. | EFL tolerance @ 10.6 µm, %: | +/- 2 |
| 7. | Stripe width, mm: | 4 (+0.5/-0) |
| 8. | Surfaces quality, scr/dig: | 60/40 |
| 9. | Surface figure, fringe: | 8 |
| 10. | AR Coating reflectivity per surface 10.6 µm, %: |
< 0.5 |
Fig. 1 Cylindrical DFL working principle.
Tydex supplies cylindrical DFL with the following EFL combinations: 127 & 254 mm, 169 & 254 mm.
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