Special optics for 1550 nm and 1850 - 1980 nm
Welding clear polymers using 1.4 µm to 2 µm
erbium or thulium fiber lasers with asphere
or 2 axis f-theta lens optics
Lasers emitting from 1.4 µm to 2 µm have played a unique role in medical, airborne and manufacturing applications. They are used in applications such as micro machining of metals, ceramics and glass as well as in plastic welding. Only recently was the high level of absorption in various translucent and transparent polymers recognized to be suitable for welding using lasers. Some clear polymers show absorption rates of more than 50% at 1.94 µm. An additional benefit is the resulting welds are also optically clear. It is also possible to join multiple layers thin layers of plastics using multiple weld passes. The key benefit is that no material modifications or infrared absorbing layers are needed.
Sill Optics provides a complete series of collimation aspheres, beam expanders and f-theta lenses for 1.55 µm and 1.85 µm - 2 µm. The focal lengths of the aspheres range from 20 mm to 200 mm with a variety of clear apertures. Fixed magnification beam expanders with expansion factors from 1.5 to 12 as well as zoom beam expanders with a variable magnification ratio from 1 to 3 are available. All optical elements used are made of fused silica and include anti-reflective coatings to ensure maximum transmission and minimum absorption. The optics are optimized for fiber lasers to ensure a consistent spot uniformity over the entire scan field. Standard and telecentric scan lens are available from field sizes from 20 mm x 20 mm to 215 mm x 215 mm.
List of new lenses for 1550 nm an 1850 -1980 nm [1.217 KB]
