RT Journal Article
T1 Near field diffraction of cylindrical convex gratings
A1 Torcal Milla, Francisco José
A1 Sánchez Brea, Luis Miguel
A1 Bernabeu Martínez, Eusebio
AB We analyze the field produced by a cylindrical convex diffraction grating at the Fresnel regime for several kinds of light sources, including a monochromatic quasipunctual source, finite size, and polychromatic sources. These results can help one understand the functioning of rotary optical encoder technology. A decrease in the self-image contrast is produced for finite nonpunctual sources. In addition, the polychromaticity of the source affects the smoothness of the self-images, making them quasicontinuous from a certain distance from the grating forward. Finally, we experimentally validate the obtained analytical predictions.
PB IOP Publishing
SN 2040-8978
YR 2015
FD 2015
LK https://hdl.handle.net/20.500.14352/35041
UL https://hdl.handle.net/20.500.14352/35041
LA eng
NO © 2015 IOP Publishing Ltd. The authors thank Jose Maria Herrera-Fernandez for his help with graphics. This work has been supported by the project DPI2011-27851 of the Ministry of Science and Innovation of Spain and the project Fagor Automation-UCM Ref. 92/2014.
NO Ministerio de Ciencia e Innovación (MICINN), España
NO Project Fagor Automation-UCM
NO Universidad Complutense de Madrid (UCM)
DS Docta Complutense
RD 4 abr 2025