technology products lenses and optics Adaptive optical components homegenisation optics


Dilas has recently begun producing solutions for homogenised area illumination. According to the company, homogenisation of


radiation is becoming more and more important in thermal and medical applications. Dilas achieves this homogenisation by actively mixing laser radiation using crossed micro- lens-arrays (MLAs), resulting in a defined rearrangement of the light. This concept is an ideal solution for medical applications such as hair removal or dermatology, as well as for thermal treatments in industrial processes. The innovative process leads to a uniformity


of up to 95 per cent or more, with steep edges and no intensity spikes in a square- shaped 12 x 12mm spot at a defined working distance (62mm). The square-shape is best for rasterisation of larger areas with no overlap and very high coverage of the area. Other geometries are available upon request according to customer specifications. The homogenisation optics are suitable for a variety of fast-axis collimated diode laser beams. They can be attached to various Dilas products, such as the 12-bar water-cooled stack, delivering up to 1kW pulse power in the millisecond range. www.dilas.com


plano-convex axicon


Edmund Optics has introduced a new range of plano-convex (PCX) axicon lenses, featuring one conical surface and one plano surface. The lenses are used to produce a non-diffractive ring-shaped beam that increases in diameter over distance, while retaining a constant ring thickness. When plano-convex (PCX) axicons are used in conjunction with a collimated Gaussian Beam they create an approximation of a Bessel beam. The


sensors and detectors Wavefront sensor system


Qioptiq has announced that it is the sole distributor of Optocraft’s SHSLab BR-110-GE-STD wavefront sensor system, now available through Quioptiq’s Linos product line. The sensor


system is designed for fast characterisation of optical components and lasers in research and


quality assurance applications. The SHSLab reliably measures extremely curved


wavefronts in real-time and with high stability, enabling new approaches in research, quality assurance and development of optical and laser- based systems. The device’s sensor head offers excellent accuracy for laser analysis and optics testing, and also for partially coherent light sources such as LEDs. The sensor head delivers a lateral


resolution of 58 x 43 micro-lenses, and is based on a camera with 12-bit greyscale and modern Gigabit Ethernet interface. The measurement principle is fast and stable, since no reference wavefront is needed and all information about the wavefront is extracted from a single camera frame. It is possible to increase the accuracy by means of different referencing methods. www.qioptiq.com


Flexible Optical BV (also known as OKO Technologies), a provider of adaptive optics based on piezoelectric and membrane deformable mirrors, has introduced three


novel components for cheaper, simpler and more reliable adaptive optics: a membrane deformable mirror with integrated tip-tilt stage, a piezoelectric laser deformable mirror, and a 40-channel digital-to-analogue converter. The membrane deformable mirror with


integrated tip-tilt stage has been specially designed for correction of low-order aberrations. The deformable mirror has a 17-actuator


gauss filter for lasers


NKT Photonics has launched its new Gauss filtering accessory for its SuperK line of supercontinuum fibre lasers for OCT and white light interferometry applications. The Gauss harnesses the wide spectral bandwidth of the SuperK Extreme supercontinuum lasers and provides a Gaussian-like spectrum. For OCT, the SuperK Gauss provides two high power spectral outputs centred at 800nm and 1,300nm, with bandwidths of up to 200nm, through single mode fibre using the SuperK fibre delivery


geometry optimised for the correction of the low- order aberrations, integrated with a piezoelectric tip-tilt stage. The mirror has tip and tilt range of 24µm at 10mm aperture, and an 8.8µm defocussing range in the reflected wavefront. The piezoelectric laser deformable mirror was


designed specially for the correction of low-order aberrations. By locating 18 of the mirror’s 19 actuators


outside the 20mm aperture, the device offers perfect correction of the first 15 Zernike polynomials with very little actuator print-through. While working with high-power beams the mirror provides optimal correction of low-order aberrations, causing no hot spots. www.okotech.com


system. Similar configurations are also available for white light interferometry applications. The SuperK Gauss also allows the tuning of the centre wavelength of each band over 200nm. The SuperK series of industrial supercontinuum lasers and accessories are used in biomedical instrumentation for applications in imaging and analysis. All SuperK lasers are based on a monolithic fibre platform and need no alignment, no warm up time and have lifetimes exceeding industry standards. www.nktphotonics.com


lenses are well suited to laser-drilling and optical coherence tomography (OCT) applications. Bessel Beams are ideal for a wide range of


medical research, such as optical injections and corneal surgery, as well as measurement and alignment applications. A Bessel beam is a non- diffractive beam made up of rings that each have power equal to every other ring. Bessel beams are purely theoretical in nature, as they require an infinite amount of energy, however, the output


of a plano-convex axicon provides an accurate approximation of the beam, because it exhibits and maintains high level non-diffractive Bessel beam characteristics. The PCX axicons are available uncoated or with VIS coating in apex angles from 90º to 179º at a diameter of 25.4mm. Featuring a precision fused silica substrate, the lenses are also available with a UV-AR coating with apex angles of 90º and 130º and a diameter of 25.4mm. www.edmundoptics.com


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electro optics l APRIL 2011


www.electrooptics.com


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