Navigation : EXPO21XX > AUTOMATION 21XX > H26: Testing and Quality Control > Sill Optics (Laser Optics)
  • Offer Profile
  • Sill Optics is one of only a few mid sized companies in Germany specialized in the production of optical components. Its philosophy “100% Made in Germany” is maintained throughout its own production and supplier chain.

    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

    • 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.

      Custom made lenses

      In addition we offer custom made systems of special ƒ-theta lenses up to complex opto-mechanical systems. Our resources comprise both extensive experience in optical design with Zemax and mechanical engineering with SolidWorks. Production with modern technologies from single prototypes up to medium quantities are possible to fulfill exceptional requirements.

        • 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.

            Standard lenses focus the laser beam on a spherical plain in contrast to an ideal flat or plane field. The use of ƒ-theta lenses provides a plane focusing surface and almost constant spot size over the entire XY image plane or scan field. The position of the spot on the image plane is directly proportional to the scan angle. 
              • 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

                      • 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.
                              • Mounted protective windows

                              • Some of our scan optics do not have protective windows as a standard. For these types, we recommend our mounted protective windows for the protection of the front lens.
                            • Lenses for Machine Vision

                              • For more than 40 years, Sill Optics has been designing, producing and offering telecentric lenses for machine vision. Based on the success of profile-projection lenses, which are still available, a wider range of telecentric lenses for modern imaging processes has been developed to meet demanding requirements. Furthermore our product range has been extended by lenses with coaxial illumination, entocentric macro optics, wide-angle lenses and telecentric condensers.

                                Sill Optics’ philosophy is to develop and produce completely at their own site in Germany. Our flexibility, besides high quality, is also to offer customized solutions, modifications and designs on short notice.

                                Custom-made lenses

                                Our catalog presents only our most common products. In addition we offer customized systems of special telecentric or entocentric lenses up to complex opto-mechanical systems. Our resources comprise both extensive experience in optical design and mechanical engineering. Production with modern technologies from single prototypes up to medium quantities is possible to meet highest demands.

                                  • Telecentric lenses

                                    • TTelecentric lenses are designed with an entrance pupil placed in infinity. Compared to entocentric lenses, only parallel principle rays are imaged through the lens. This ensures a constant magnification for the entire depth of field.

                                      Specifications of our lenses, e.g. about distortion or resolution, are according our datasheets, which are available at the download section of the product tables.

                                      Our standard lenses are just an idea of the various adjustment possibilities. Please let us know your requirements.ext
                                        • Fixed and variable aperture stop

                                        • Most lenses from Sill Optics are supplied with a variable aperture stop. This provides the advantage to adjust the luminance, resolution and depth of field of the application. Lenses with a fixed aperture stop are indicated with a blue dot. As some lenses are exposed to vibrations or fast motion, we offer the variable aperture stops to be exchanged by a fixed aperture stop. The size of the fixed aperture stop can be defined by a lens with variable aperture, which can be rented beforehand.
                                        • Coaxial illumination

                                        • The combination of a telecentric front illumination with the imaging lens is possible for most of our lenses. These coaxial illumination versions are available with a fixed LED of various wavelengths (blue, green, red) or with Ø8mm fiber /spot port or Ø6mm fiber port. The part number changes from S5LPJxxxx to S5LPLxxxx.
                                        • Variable working distance and magnification

                                        • Sometimes suitable lenses do not meet the desired working distance for the planned setup. In most cases adjustment to your requirements is possible. Please contact our product and project managers. Modification of the working distance usually results in modified magnification. Thus adaption of the magnification is also possible.
                                        • Variable sensor mount

                                        • Most Sill lenses are designed for waveband 450nm – 700nm in the visual spectrum. Thereby monochromatic applications (narrow-banded illumination, black-white sensors) and polychromatic applications (broad-banded or white illumination, color sensors) are possible.

                                          Please note, that some particular designs are only constructed for one wavelength or a narrow range, respectively.

                                          Moreover there are special lenses for the UV- and NIR-range available.

                                          In case of special requirements please contact us for a compatibility check to your specifications.
                                        • Scheimpflug configuration

                                        • Due to limited installation space or specific measurement circumstances, an imaging lens might be in a tilted position towards the object. To compensate the resulting blur and deformation in the image, the lens can be mounted to the sensor with a compensating angle. As the compatibility of the lens to the measurement setup depends on various factors (sensor size, viewing angle, magnification, resolution,... ), Sill offers suitable adapters on demand.
                                        • Glued lenses

                                        • For lenses which are exposed to severe vibrations or are placed inside moving parts of machines a glued version is recommended.
                                        • Extended wavelength ranges

                                        • Most Sill lenses are designed for waveband 450nm – 700nm in the visual spectrum. Thereby monochromatic applications (narrow-banded illumination, black-white sensors) and polychromatic applications (broad-banded or white illumination, color sensors) are possible.

                                          Please note, that some particular designs are only constructed for one wavelength or a narrow range, respectively.

                                          Moreover there are special lenses for the UV- and NIR-range available.

                                          In case of special requirements please contact us for a compatibility check to your specifications.
                                      • Telecentric illumination

                                        • Here you can find the telecentric background illuminations suitable for our telecentric lenses. Various diameters and wavelengths are available. Especially high-precision measurements demand telecentric illumination. This avoids reflections at the edges of objects and increases the accuracy of measurement.
                                              • Telecentric illumination

                                              • Our condensers, depending on their LED-unit, are divided into three series. Whereas the S6IRIxxxx-line with standard LEDs is designed for low illuminance with constant current, the high-power LEDs offer higher output power and are flashable.

                                                In addition the new condenser series S6LTCxxxx offer an integrated dimmer, better illumination homogeneity and even further improved output power.