This can also be seen in the formula for calculating the minimum spot size:
dF = λ·APO·f'·M² / dL
dF: focal spot diameter / λ: wavelength / APO: apodisation factor / f': focal length / M²: M² value of the laser / dL: entrance bem diameter
We have extended our existing series of telecentric scan lenses with a focal length of 48 mm to meet the ever increasing laser pulse power micro processing. The lenses can withstand even highest fluences because of the lens material (fused silica) and the special low‑absorption coatings. Especially for USP lasers a lens design without critical back reflections is very important.
The lenses are optimized for scanners with 7 mm to 15 mm apertures and can be easily installed using an adaptor ring. Smallest spot diameters of 6 µm at 1064 nm wavelengths, 3 µm at 532 nm and 2 µm at 355 nm can thus be achieved.
|part number||wavelength [nm]||focal length [mm]||scan area [mm x mm]||max. input beam-Ø [mm]||working distance [mm]|
|S4LFT4147/328||1030 - 1090||48.1||7 x 7||15.0||61.1|
|S4LFT4148/292||515 - 545||48.0||6 x 6||15.0||60.0|
|S4LFT4149/075||355||48.1||6 x 6||15.0||69.3|