420-mm Lens Optimized For 3D Manufacturing

Qioptiq, an Excelitas Technologies Company, introduces its F-Theta Ronar 420 mm Lens for use in 3D manufacturing, welding and semiconductor fabrication. The component is optimized for the 1/e² truncated beam diameters 14 mm, 15 mm, and 20 mm. Its large focal length supports applications in the additive manufacturing, semiconductor, and metalworking industries.


The 420-mm Lens features a low absorption and high laser damage threshold, as well as a special coating optimized for wide angles. As a result, an almost constant transmission is achieved over the entire scan field. The lens also handles high-power laser applications. At 14 mm, the spot diameter is 29 μm and the scan field size is 251 mm x 251 mm.

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A small spot diameter and fused silica design minimize the thermal focus shift and allow working with high laser powers. The component’s green spectral range is more suitable for metal processing than the infrared spectral range of 1030 nm to 1080 nm. Metals, and non-ferrous metals, absorb light better in the green spectrum, which is why lower laser powers can be used. In addition, the spot sizes are smaller at the same aperture than the longer-wavelength lenses, so that finer structures with higher power density can be processed. For more enlightenment, peruse the F-Theta Ronar 420 mm Lens datasheet.

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