RT Journal Article T1 Improved regularised phase-tracking technique for the processing of squared-grating deflectograms A1 Quiroga Mellado, Juan Antonio A1 Villa Hernández, José de Jesús A1 Servín Guirado, Manuel AB We propose a robust procedure based on the regularized phase-tracking (RPT) technique to demodulate squared-grating deflectograms. The use of squared gratings, already reported, lets us multiplex the information of the deflections in two orthogonal directions in a single image, thus avoiding the necessity of rotating the gratings. The good noise-rejection characteristics of the RPT technique are improved by use of a quasi-Newton optimization algorithm and a quality-map-based algorithm for the crystal-growing process. PB The Optical Society of America SN 0003-6935 YR 2000 FD 2000-02-01 LK https://hdl.handle.net/20.500.14352/58791 UL https://hdl.handle.net/20.500.14352/58791 LA eng NO © 2000 Optical Society of America.We acknowledge the support of a postdoctoral grant from the Universidad Complutense de Madrid, the “Becas Internacionales Flores-Valles” program, Spain, and the Consejo Nacional de Ciencia y Tecnología (CONACyT), México. NO Becas Internacionales Flores-Valles program, Spain NO Universidad Complutense de Madrid NO Consejo Nacional de Ciencia y Tecnología (CONACyT), México DS Docta Complutense RD 8 jun 2025