RT Journal Article
T1 Collimation method using a double grating system
A1 Sánchez Brea, Luis Miguel
A1 Torcal Milla, Francisco José
A1 Salgado Remacha, Francisco Javier
A1 Morlanes Calvo, Tomás
A1 Jiménez Castillo, Isidoro
A1 Bernabeu Martínez, Eusebio
AB We present a collimation technique based on a double grating system to locate with high accuracy an emitter in the focal plane of a lens. Talbot self-images are projected onto the second grating producing moiré interferences. By means of two photodetectors positioned just behind the second grating, it is possible to determine the optimal position of the light source for collimation by measuring the phase shift between the signals over the two photodetectors. We obtain mathematical expressions of the signal in terms of defocus. This allows us to perform an automated technique for collimation. In addition, a simple and accurate visual criterion for collimating a light source using a lens is proposed. Experimental results that corroborate the proposed technique are also presented.
PB The Optical Society Of America
SN 1559-128X
YR 2010
FD 2010-06-10
LK https://hdl.handle.net/20.500.14352/44286
UL https://hdl.handle.net/20.500.14352/44286
LA eng
NO © 2010 Optical Society of America.This research has been supported by project CCG08-UCM/DPI-3952 of Dirección General de Universidades e Investigación de la Consejería de Educación de la Comunidad de Madrid and by project DPI2008-02391 of the Ministerio de Ciencia e  Innovación of Spain.
NO Dirección General de Universidades e Investigación de la Consejería de Educación de la Comunidad de Madrid
NO Ministerio de Ciencia e Innovación (MICINN), España
DS Docta Complutense
RD 9 abr 2025