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  • Offer Profile
  • 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.

    Laser Optics

    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.

Product Portfolio
  • Laser Optics from Sill Optics

    • You will love our laser optics

      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.

        • ƒ-Theta lenses

          • ƒ-Theta objectives, also known as flat-field objectives or scan objectives, are used in many industries. While standard lenses display the laser beam on a spherical shell, but not on an even field, ƒ-Theta objectives have one major advantage: You can use them to position the laser focus on a level image field, while the focus size remains almost constant. The position of the focus point (image height) is proportional to the scanning angle.
              • ƒ-theta lenses

              • Lenses used in combination with XY galvanometer scanners are called ƒ-theta lenses, plane field objectives or simply scan lenses. ƒ-theta lenses are used in various applications from industrial material processing, drilling, welding of synthetic material and cutting in addition to medical and biotechnology (confocal microscopy, ophthalmology) to science and research. The design and the quality of the optical components are playing a decisive role.
              • Optical glasses vs. fused silica

              • Short pulse lasers and ultra-short pulse lasers, but also lasers with high average power issue a exceptional challenge for lenses. Processed are strongly influenced by the characteristics of regular optical glasses. For instance thermal effects change both the beam shape and the working distance. At this point fused silica presents its crucial advantage by lower sensitivity to thermal effects in comparison to optical glasses and is therefore highly recommended for the use with the named laser sources above.
              • Telecentricity

              • While the dispersion in the material can neglected for fs-pulses, the color error caused by the spectral width of the pulse plays a decisive role. The spectral width of the pulse is increasing rapidly by shorter pulse durations and for longer wavelengths. This results in a color error where the axial and lateral position of a focused beam varies for different colors. The amount of deviation of the resulting spot depends on the focal length and the wavelength. Sill offers ƒ-theta lenses which are especially designed for the use with femtosecond lasers and correct this color error leading to a consistent beam shape over the complete scan area.
              • Color corrected ƒ-theta lenses

              • While the dispersion in the material can neglected for fs-pulses, the color error caused by the spectral width of the pulse plays a decisive role. The spectral width of the pulse is increasing rapidly by shorter pulse durations and for longer wavelengths. This results in a color error where the axial and lateral position of a focused beam varies for different colors. The amount of deviation of the resulting spot depends on the focal length and the wavelength. Sill offers ƒ-theta lenses which are especially designed for the use with femtosecond lasers and correct this color error leading to a consistent beam shape over the complete scan area.
              • Multispectral ƒ-theta lenses

              • 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.

            • Beam expanders

              • Beam expanders are optical systems used to increase or decrease the beam diameter. The product of beam diameter and divergence of the laser beam is a constant and therefore remains unchanged, i.e. increasing the beam diameter means reducing the divergence of the beam to the same degree. This is true for the expanders with fixed expansion factor as well as for the zoom expanders, where the magnification is variable. Each type of our beam expanders offers a manual or motorized divergence adjustability.
                  • Beam expanders

                  • 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 variation

                  • Our beam expanders are available in diverse variations and additional special functions. Please note the following listing as an overview:

                    • fixed magnification
                    • fixed magnification for large beam diameters
                    • compact beam expanders with fixed magnification
                    • fixed magnification with motorized divergence adjustment
                    • variable magnification (zoom beam expander)
                    • motorized variable magnification
                    • combined motorized magnification and divergence adjustmen
                • Aspheres

                  • Aspheres offer the great advantage to accomplish imaging tasks with one optical element where lens systems were needed otherwise.

                    Main advantages of aspheres are:

                    • less spherical aberrations
                    • less weight
                    • increased transmission
                    • no internal ghosts

                    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).

                      • Production of aspheres up to diameter 200 mm

                      • 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. 

                      • Our technological possibilites

                        • Diameter: 12 - 200mm
                        • Diameter tolerance: ±0.01mm
                        • Thickness tolerance: ±0.01mm
                        • Concave radius of curvature (local): > 35mm
                        • Sagittal deviation (PV): < 0.5fr (= 0.137µ )
                        • Irregularity (PV): < 0.5fr (= 0.137µ )
                        • Rotaional invariant irregularity (PV): < 0.2fr (= 0.055µ )
                        • RMSi (PV): < 0.1fr (= 0.025µ )
                        • Centration (tilt angle between surfaces): < 1arcmin
                        • Cleanliness / imperfections: 3x0.04 (S/D:10/5)

                        Materials:

                        • all fused silica types (Corning, Heareus, Nikon, Ohara)
                        • optical glasses (CDGM, Hoya, Nikon, Ohara, Schott,...)

                        Metrology:

                        • tactical 2D measurement
                        • 2D / 3D profilometry via white light interferometry
                        • interferometric wavefront measurement (632.8 nm)
                    • Focusing lenses

                      • Multi-element lens systems minimize the imaging errors of single lenses and provide precision focusing for non-scanning applications. You have to distinguish between monochromatic and achromatic systems.

                        Monochromatic systems are only corrected for a specific wavelength. So they are most suitable for laser applications. Especially fused silica lenses in air-spaced design are preferably chosen for collimation or focusing of high power laser.
                            • Mounted air spaced multi element systems in fused silica andoptical glass

                            • We offer mounted air spaced multi element systems in fused silica andoptical glass.

                              Achromatic systems have to consist of lenses with different glass types and dispersions. Only a matched combination allows the correction of the chromatic error especially in the visible range. Usually components are cemented. That leads to a reduced damage threshold of the achromatic system, which limits the use of laser with average powers of less than 200 watt.
                        • Accessories

                              • Telephoto lens

                              • These lenses are designed for observing the process by a camera system through the scan lens. The field of view is defined by the ratio of the focal lengths of the scan lens and of the camera lens. An integrated illumination system through the camera lens is recommended, which concentrates the light exactly onto the required field of view.
                              • Lens mount

                              • The adjustment of optical components into a laser beam is often a challenge. Many commercial holders realize tilt or an axial offset by a fine adjustment only. The holder of Sill Optics realizes both: a tilt (+/-0.5°) and a lateral shift (in X and Y of +/-1.5 mm) in one mechanical component. This developed holder has an additional remarkable advantage: It tilts the optical system in reference to the optical and not in terms of a lateral shifted axis. Therefore it is not necessary to track the lateral components while angular adjustment. The holder can be mounted in two positions, 0° and 45° or can be integrated directly into a mechanical holder without the base also.