technology
Measuring wavelengths precisely
rob coppinger rounds up the latest interferometry products
4D technology’s AccuFiz Fizeau laser interferometer offers high-performance, quality and value, for accurate shape and transmitted
wavefront quality measurements of optics and optical surfaces. AccuFiz provides unparalleled accuracy at mid-spatial frequencies, letting you measure polishing artifacts that other interferometers simply miss. The AccuFiz includes a touch-screen remote, fully motorised controls, and smart zoom for repeatable lateral resolution at all zoom settings. A range of laser sources, aperture sizes, mounting configurations and accessories are available. Optional dynamic interferometry lets users without an air table measure despite vibration and air turbulence.
www.4dtechnology.com
coherent’s Sapphire SF family of lasers features wavelengths of 488nm and 532nm with single longitudinal output to achieve a linewidth of less than 1.5MHz. With output powers ranging from 20mW to 150mW, Sapphire SF lasers provide a high quality, diffraction-limited beam with excellent beam pointing stability. Sapphire
SF lasers are based on optically pumped semiconductor laser (OPSL) technology. This well-proven technology has more than 25,000 units currently in the field. Moreover, OPSL technology features extremely low output noise, because its short upper state lifetime completely eliminates the ‘green noise’ that limits many other solid-state lasers. Primary applications include Raman spectroscopy, Brillouin scattering, holography/stereography, interferometry, metrology, inspection, and remote optical sensing.
www.coherent.com
newport’s LDS-Vector electronic autocollimator performs high-resolution angular measurements for alignment, quality assurance and metrology
applications. Featuring a highly collimated 670nm laser diode the LDS-Vector allows for non-contact measurements over long working distances of up to 20m. The use of a visible light laser diode and a large range ocular field minimises set-up time and prevents users from spending hours aligning the
Interferometry
instrument. A dual axis analogue sensor with a silicon surface provides fast 2kHz data acquisition.
www.newport.com
ocean optics’ collimation testers are lateral-shearing interferometers that can be used to examine and adjust the collimation of laser light. The testers can also be used
to measure wavefront curvature and quantify divergence, convergence magnitudes. To examine an optical wavefront in a collimating system the tester is placed at ~45° incident to an expanded beam so the face of the collimation tester is illuminated. The beam is reflected onto a screen placed at a right angle to the reflected beam. Two overlapping circular images bisected by the shadow of the collimation tester’s reference wire will appear on the screen. Fringes will be seen in the overlap region of the two images.
www.oceanoptics.com
µPhase interferometers from trioptics are compact, small and lightweight digital tools that can be used in almost any working environment. These
measuring devices are complemented by the µShape measurement and analysis software to fulfil expectations of quality management. The µPhase interferometer systems are used for measuring specular high precision components made of glass, plastic, metal or ceramic. The non-contact measurement method prevents damage to the sample under test and gives the most exact evaluation of the entire surface or wavefront.
www.trioptics-berlin.com
www.electrooptics.com
deceMber 2011/january 2012 l electro optIcs
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