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technOlOgy prOducts lenses and optics graded reflectivity mirrors improved sputter coatings


evatec has enhanced its capabilities for infrared thin film deposition, using either evaporative or sputtering technologies. using a wide choice of coatings materials,


evatec’s enhanced GSM monochromatic and broad band monitoring capability can be used to accurately terminate layer deposition for even the most complex IR coatings.The company’s Optics Toolbox software further simplifies production by allowing seamless translation of a thin film design into a coating recipe, and to the coating process itself. Optical pyrometry in evaporation systems further ensures temperature uniformities down to +/-3 per cent across the calotte for the best uniformity of process conditions. www.evatecnet.com


large scale cylindrical optics added to production chain


Berliner Glas has recently introduced large- scale cylindrical lenses and mirrors to its range of products, aimed at laser material processing applications. The components are produced in all standard shapes with a length of up to 1000mm, offering customers cost-efficient access to cylindrical optics. The company has recently expanded its entire


optical production chain by adding a series of innovative grinding and polishing processes to the shaping and CnC processing of large- scale optics. The whole production process is completed with the greatest care and in consideration of the highest requirements on cleanliness. Berliner Glas is able to offer both plano


and cylinder surfaces of the highest quality. The company uses its specially developed computer-controlled corrective procedure. The high-precision metrological monitoring of the surface allows for successfull correction. www.berlinerglas.de


Fibre bundle beam shapers


Schott has developed a range of fused fibre bundles for forming ‘square’ laser diode light into homogeneous beams of any shape required. The beam shaper is made of flexible glass fibres and can be coupled directly with the laser diodes, eliminating the need for collimating lenses. Laser diodes are compact and efficient,


but they emit light asymmetrically. In order to compensate for this, fast axis collimation (FAC) lenses are usually required, which can be difficult to adjust. Schott claims that its fibre- bundle beam shaper is much easier to use. The device consists of multi-component glass


30 electrO Optics l june 2011


ReO has introduced a new series of graded reflectivity mirrors, enabling precise spatial shaping of both the intensity and phase characteristics of laser beams. In graded reflectivity mirrors, the reflectivity and/or phase effects of the coating vary radially across the surface of the optic. ReO can produce these mirrors with virtually any arbitrary variation, including non-rotationally symmetric patterns, as well as with complex designs in which the reflectivity increases and decreases repeatedly across the component. The most common application for graded


reflectivity mirrors is as cavity optics in unstable resonator lasers. In this case, the use of a second order Gaussian or super-Gaussian (Gaussiann) reflectivity profile allows maximum power extraction from the resonator, as well as a smooth far field output beam profile. A Gaussian profile mirror can also be used to achieve laser output with a uniform irradiance distribution, which is often required in illumination, materials processing and surgical applications. The ability to shape the phase of a laser’s emergent wavefront can aid in achieving better focusing characteristics, and can also improve coupling efficiency into optical fibres. ReO offers the graded reflectivity mirrors on


MrF polishing system


QeD Technologies has introduced Q-flex, its next generation magnetorheological finishing (MRF) polishing system. The Q-flex system offers the determinism of MRF in a newly designed modular platform that allows quick configuration changes and provides manufacturing capabilities for difficult spheres, aspheres and freeform optics. The system takes precision optics polishing


to new levels of performance and flexibility while enhancing its ease of use. Q-flex incorporates all new MRF polishing head


a wide range of substrate materials, including fused silica, various optical glasses, ZnSe, ZnS and Si, for operation over the 266nm to 5µm spectral range. The mirrors are available with diameters from 0.25 inches (6mm) to 5 inches (127mm). Reflectivity pattern variations can be achieved down to a scale of approximately 1mm. The use of ion beam sputtering (IBS) coating technology makes these optics suitable for intracavity laser use, and provides a combination of high damage threshold, spectral stability, environmental stability and mechanical durability that makes them compatible with use in demanding environments. www.reoinc.com


designs with 20, 50 and 150mm wheels. Features such as kinematic base plates and automatic head alignment enable tool-free head changeovers in minutes. new QeD.neT software, based on the latest


.neT framework, provides different process flows for prototype and production modes, and allows for customised access by different levels of users. Its ‘wizard’ feature guides users through many processes with an online help system available to answer any questions that may arise. www.qedmrf.com


fibres that have been fused into a rectangular shaped input profile. At present, sizes of up to 15.0 x 1.0mm are available. Coupling the laser diodes without FAC lenses improves the overall performance and flexibility of these devices. The light emitted by the laser diodes can be


converted into various shapes, for instance a circular shape with a small diameter, and thus exhibits high laser beam quality. The existing fibres cover a numerical aperture range from 0.4 to 0.8. Furthermore, transmission of 80 per cent is possible for common light guide lengths of up to 2000mm. The beam shapers are capable of withstanding temperatures of up to 150°C. www.schott.com


www.electrooptics.com


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