Sill Optics is the specialist for quality and innovation in the field of photonics technologies. With regard to customized development as well as standard solutions we have established ourselves internationally and are one of the leading companies in this business. The company with more than 125 years of experience is located in Wendelstein.
We offer lenses for various laser applications. Our product portfolio includes simple focusing lenses as well as beam expanders, standard ƒ-theta scan lenses and a variety of telecentric ƒ-theta scan lenses. These lenses are predominantly optimized for wavelengths in the range of 266 nm to 1090 nm.
The product portfolio of Sill Optics ranges from simple collimation- and focusing optics to beam expanders to telecentric and non-telecentric scan lenses. We cover thereby the complete wavelength range from 193 nm to 1980 nm.
Mainly applications with solid state lasers around 1064 nm and its harmonic generations are covered. Furthermore, we provide lenses designed for disc lasers and fiber lasers in the range of 1030 nm to 1090 nm, as well as diode lasers from 800 nm to 980 nm or 900 nm to 1070 nm. Additionally many of our lenses, beam expanders and lens systems are optimized for the use with short pulse lasers (picosecond range) and ultra-short pulse lasers (femtosecond range). Lenses are also offered for very short wavelengths around 193 nm and 248 nm, but also for more long-wave radiation in the near and mid infrared regime (1550nm and 1980nm). A large selection of multispectral scan lenses allow monitoring through the used optics or use of multiple wavelengths and complete the range of our scan lens product range.
For online inspection systems we successfully introduced color corrected ƒ-theta lenses for 1064 nm and 532 nm to the market. Color correction offers usage of one lens for several manufacturing steps at the same time.
In addition, we offer color corrected ƒ-theta lenses designed for confocal microscopy applications optimized for a wavelength range from 450 nm to 650 nm and a lens optimized for 355 nm and 1064 nm. The focal lengths and working distances are identical for several wavelengths, resulting in identical image fields for the laser and inspection wavelength respectively for a whole wavelength range.
All optical elements of beam expanders consist of fused silica and provide stable and reliable performance even with high average power or laser with high peak power. Because of the high power density (especially at the entrance lens element) we advise our low absorption coating as standard product.
For each magnification ratio, at least one beam expander without internal ghost is available offering stable working conditions even at high power and small entrance beam diameter.
Our beam expanders are available in diverse variations and additional special functions. Please note the following listing as an overview:
Aspheres offer the great advantage to accomplish imaging tasks with one optical element where lens systems were needed otherwise.
Main advantages of aspheres are:
The combination of high purity fused silica and low absorption coatings decreases the thermal induced shift of focal length and working distance.
Another application of an asphere is beam shaping with respect to the intensity distribution or the phase. A typical conversion is the change of a Gaussian profile into a top-hat profile. For material processing, this form has the advantage of a more homogeneous removal of surface material, steeper borders between removal zone and surrounding material and a resulting smaller heat affected zone (HAZ).
The capability of Sill Optics MRF machines allows production of aspheres up to diameter 200 mm. Measurement setup (interferometric wavefront test, tactile and optical 3D profi lometry) enables us to
ensure a surface quality of 0.15 μm PV(fWD) and RMSi < 0.025 μm depending on geometry. Even sagittal heights z(r) up to 21 mm are measurable enabling the production and test of very steep radii at certain diameters.
Our range of products covers unmounted and mounted precision aspheres out of fused silica with focal lengths from 20 mm to 400 mm, which are usable for focusing and collimation.
Special forms and customized versions are available on request.