PRODUCT FOCUS OPTICAL METROLOGY
PRODUCT FOCUS MADE TO MEASURE
4D Technology has introduced a Vertical Digital Radius Slide for precise radius of curvature (ROC) measurement of concave or convex optics. The Vertical Digital Radius Slide (VDRS) provides axial positioning resolution to 1µm for extremely accurate ROC measurement using 4D Technology’s AccuFiz compact laser interferometers. The VDRS integrates with 4D Technology’s 4Sight data analysis software for fast, wizard- based ROC measurement. The system can accurately measure ROC without precise null at the cat’s-eye or confocal positions, resulting in increased accuracy and throughput. Easy-to-use controls and a long travel range make the VDRS simple to install and to use daily. 4D Technology’s family of digital radius slides also includes an encoder-based horizontal slide, and a horizontal slide with Laser Doppler Distance Measurement (LDDM) for 10nm axial position resolution. AccuFiz Fizeau laser interferometers offer
excellent lateral resolution and the ability to measure optical components and systems without vibration isolation. With a wide range of apertures and wavelengths, and a comprehensive line of accessories, AccuFiz interferometers provide best-in-class value and performance.
www.4dtechnology.com
Sphere Optics has launched a new lighting laboratory to provide precise measurement services to manufacturers, light designers or even lidar users. It enables the cost-effective testing of classical parameters of luminaires and lamps, like luminous flux (lumens), spectrum, colour parameters (CIE colour values, colour rendering index, colour temperature, etc.), efficacy (lumens per watt), luminance (cd/m²) as well as near- and far-field light distribution (ray- files, IES and EULUMDAT data). In addition, the firm offers specific
measurement procedures for the determination of optical material properties, like scatter parameter (BRDF, BTDF, TIS), as well as reflectance- and transmittance factors. Finally radiometric calibrations of photo detectors, spectrometers and hyperspectral cameras complete are included in the range of customised services.
www.sphereoptics.de
www.electrooptics.com | @electrooptics
Selected for their very high frequency stability, low frequency and intensity noise, the Koheras single frequency fibre lasers supplied by Photonic Solutions are playing a vital role in the development of Quantum Gravity sensors by the Quantum Technology Hub in Sensors and Metrology. Headed by the University of Birmingham in the UK, the hub is developing unique sensors that rely on the quantum superposition effect that can register minute changes in the gravity field. This in turn, is used for the detection of sinkholes, location of pipelines, archaeology and so on. Quantum superposition lies at the heart of quantum theory, allowing two classically distinct and exclusive alternatives to coexist. This principle of quantum mechanics has been exploited by the Hub’s ‘atom trap’ based quantum sensor. Laser cooling and trapping methods are used to confine and control the atomic motion of rubidium atoms and the Koheras lasers are then used to create superposition states and recombine them after some measurement time, leading to interference in final state populations. Separating the paths vertically enables the measurement of gravity and rotation respectively. Thus the Quantum Gravity Sensor is realised.
www.photonicsolutions.co.uk
Optical Surfaces has received an order for precisely matched etalon pairs from The Table Stable (Mettmenstetten, Switzerland) for use as a component in their ultra-high resolution JRS series interferometers. Optical Surfaces’ production team
is able to routinely produce the 50mm diameter fused silica etalons pairs for Table Stable with matching accuracies of better than lambda /200. Etalon manufacture places extreme demands on a company’s production capabilities. Material purity, optical figure, plate parallelism, plus surface, spacer and coating quality are all critical to the overall performance of an etalon. Optical Surfaces has been producing optical components and systems for more than 50 years and is now accepted as a specialist in the production of high-precision optics for interferometry.
www.optisurf.com
A round-up of the latest light-based
measurement solutions
Zygo’s Verifire HDX is a high-resolution Fizeau interferometer for surface form and wavefront metrology of optical components and systems. The high resolution camera and optimised optical design enable mid-spatial frequency content characterisation – a critical need for high precision applications. For versatility and precision, the Verifire HDX
interferometer includes all the great features of the popular Verifire HD – such as QPSI, and a long-life stabilised laser – and adds important enhancements like improved imaging and resolution for high instrument transfer function (ITF), superior characterisation of mid-spatial frequency content and high-slope surface deviations, as well as Zygo’s DynaPhase dynamic acquisition technique (optional) that eliminates problems resulting from vibration and enables precision metrology in nearly any environment.
www.zygo.com
December 2017/January 2018 Electro Optics 49
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