A detailed study of the practical design considerations for a focus error measurement system through numerical simulations, based on ABCD ray matrix for Gaussian beams, is presented. The results obtained can be applied in an equivalent way to the cases of reflection or transmission measurement, since these are identical by means of a change of variables. In all cases, the calculations consider the actual shape of the detector used, since these have gaps that separate the quadrants, affecting their efficiency. The distances involved between the optical components are swept in order to study the behavior of the sensitivity, maximizing it depending on the application.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.