Reference algorithms and metrology on aspherical and freeform lenses

Short Name: FreeFORM, Project Number: 15SIB01
Large Close up of camera lens

Measurement to support innovation in optical aspheres and freeform surfaces 

Aspheres and freeform surfaces are components used in a variety of optical systems, from medical imaging to astronomy. They deliver better image quality compared to traditional spherical elements and as a result their use is growing rapidly. However, the ability to develop higher-performance aspheres and freeform surfaces is limited by the precision with which the shape of their surface can be measured. Although modern optical polishing techniques can remove material at the nanometre level, measurement techniques are unable to measure with the same degree of precision. This project has built on the work of the previous EMRP project IND10 Form, which achieved measurements below 100 nanometres, by developing new measurement capabilities within European National Measurement Institutes to routinely measure below 30 nanometres. The capabilities developed will strengthen Europe’s position in global optics, and will be used by industry to develop a new level in optical device performance. 

Project website
Round robin comparison study on the form measurement of optical freeform surfaces

Journal of the European Optical Society-Rapid Publications

Lens aberration compensation in interference microscopy

Optics and Lasers in Engineering

SimOptDevice: a library for virtual optical experiments

Journal of Sensors and Sensor Systems

Robust and precise algorithm for aspheric surfaces characterization by the conic section

Journal of the European Optical Society-Rapid Publications

Other Participants
Ecole Normale Supérieure Paris-Saclay (France)
Fudan University (China)
GEOMNIA (France)
IBS Precision Engineering bv (Netherlands)
Itä-Suomen yliopisto (Finland)
National Institute of Advanced Industrial Science and Technology (Japan)
Thales Angenieux SAS (France)
The Hong Kong Polytechnic University (Hong Kong)
The University of Nottingham (United Kingdom)
Trioptics GmbH (Germany)
Universidade de Brasília (Brazil)
Universitaet Stuttgart (Germany)
Ústav fyziky plazmatu AV ČR, v. v. i. (Czech Republic)