Portfolio lenses
Lenses that are used in combination with XY galvanometer scanners or polygon scanners are known as ƒ-theta lenses, flat field lenses or simply scan lenses. Our scan lenses are used in a variety of applications, such as industrial material processing (e.g. structuring, drilling, welding, cutting, etc.), in medical technology and biotechnology (confocal microscopy, ophthalmology) and in science and research. The design and quality of the optical components play a decisive role.
Optical glasses vs. fused silica
Short-pulsed and ultrashort-pulsed lasers, as well as lasers with high average power, pose a particular challenge for optics. Processes are strongly influenced by the properties of conventional glass. For example, thermal effects shift both the beam shape and the focus position. Fused silica offers a decisive advantage over optical glass in avoiding thermal effects and is highly recommended by us when using the above-mentioned beam sources.
Telecentricity
With telecentric scan lenses, the deflected beam always hits the surface to be processed almost vertically. This enables holes to be drilled or a certain depth structuring, for example. The price for this is usually a smaller processing field compared to a non-telecentric lens, as the size of the front optics must be at least the size of the processing field. Sill Optics offers a wide range of options and focal lengths for both types of scan lenses.
Color corrected scan lenses
While the dispersion in material can be neglected when using femtosecond pulses, the color error due to the spectral width of the pulse plays an important role. The spectral width of the pulse increases rapidly with shorter pulses and longer wavelengths. This results in a color error that has a different axial and lateral image position for different wavelengths. Our range includes scan lenses specifically for use with femtosecond lasers, which are designed to correct this color error and thus guarantee uniform beam quality across the processing field.
Color corrected scan lenses
While the dispersion in material can be neglected when using femtosecond pulses, the color error due to the spectral width of the pulse plays an important role. The spectral width of the pulse increases rapidly with shorter pulses and longer wavelengths. This results in a color error that has a different axial and lateral image position for different wavelengths. Our range includes scan lenses specifically for use with femtosecond lasers, which are designed to correct this color error and thus guarantee uniform beam quality across the processing field.