Measurement of radius of curvature directly in the interferometer confocal position

0560443 - ÚFP 2023 RIV US eng J - Journal Article
Psota, Pavel - Stašík, Marek - Kredba, Jan - Lédl, Vít - Nečásek, Jakub
Measurement of radius of curvature directly in the interferometer confocal position.
Applied Optics. Roč. 60, č. 15 (2021), s. 4485-4490. ISSN 1559-128X. E-ISSN 2155-3165
R&D Projects: GA MŠMT(CZ) EF16_026/0008390
Institutional support: RVO:61389021
Keywords : interferometer * radius * optical surface
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.905, year: 2021
Method of publishing: Limited access
https://opg.optica.org/ao/abstract.cfm?uri=ao-60-15-4485

This paper presents a new method for radius of curvature measurement by interferometers. The radius measurement is carried out directly in the interferometer confocal position without the need for a specific hardware and thus allows us to measure a much more diverse range of optical surfaces than standard methods. The method is based on measuring a number of phase maps and displacements at several steps through the confocal null position. Radius of curvature is then computed as the tangent slope of the measured defocus–displacement pair values in the confocal position. A relative accuracy of the method is approximately 0.05%, which makes the method suitable for a vast number of applications. Results of the method are verified using standard confocal cat’s eye technique.
Permanent Link: https://hdl.handle.net/11104/0333371