Project Title: Measuring Instruments for Aspherical and Free-form Optical Surfaces 1 / 2 Project no.: TA03010893 Provider: Technology Agency of the Czech Republic Realization period: 1 st January 2013 – 31 st December 2016 The aim of the project, which was completed in cooperation with Meopta - optika, s.r.o. and the Tech- nical University of Liberec, was research and development into systems and technologies for mea- suring the shape of aspherical and free-form optical surfaces which meet current requirements of industry and are more affordable and more effective than instruments available on the market. Within the project, a team consisting of representatives of all the institutions involved developed two instruments as functional samples – an interferometric and a holographic one. The interfero- metric instrument is a six-axis automatic measurement system that combines information from measurements at two wavelengths, which makes it possible to measure aspherical surfaces with high precision. The holographic gauge for free-form surfaces is a three-axis system that illumina- tes the measured surface from 16 directions and uses digital holography with frequency sweep of the laser source developed at the TOPTEC Centre. The development of these measuring systems involved their mechanical design, design and im- plementation of an innovative optical system, and soſtware development. Both instruments were tested and the results compared with reference systems. The basic parameters of the two instruments are summarized in the table: Instrument V005 - Interferometer V004 – Holographical system Automatic positioning and calibration YES YES Axis travel range X ± 120 mm Y ± 10 mm Z 1250 mm A 360° B ± 60° C ± 7° X ± 12.5 mm Y ± 12.5 mm Z ± 12.5 mm (+ rough manual shiſt) Output aperture 4“ NA (Field of view is defined by camera – element distance) Wavelength 780 nm, 850 nm 780 nm, 850 nm Maximum measurable diameter < 100 mm < 250 mm Maximum surface slope 6.5 mrad (with respect to BFS*) NA BFS deviation 90 µm Not limited Measurement repeatability (RMS) λ/50 λ/40 Camera resolution 2048x2048 pixels 2016x2016 pixels *(BFS – best fit sphere) = best matching spherical wavefront RESEARCH CENTRE FOR SPECIAL OPTICS AND OPTOELECTRONIC SYSTEMS WWW.TOPTEC.EU INSTITUTE OF PLASMA PHYSICS OF THE CZECH ACADEMY OF SCIENCES