<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2011000400004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Amplitude and phase recovering from a micro-digital hologram using angular spectrum]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Vera]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rayas]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calixto]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de investigaciones en óptica, A.C.  ]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>4</numero>
<fpage>315</fpage>
<lpage>321</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000400004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we present a method to get the complex amplitude of a digital hologram obtained through phase shifting transmission digital holographic microscopy. This is based on the angular spectrum method as a reconstruction algorithm employing an in-line experimental setup. The reconstruction technique automatically eliminates the zero order and the twin images from the digital hologram. By means of a reference hologram reconstruction method, a temporal averaging procedure and a focus distance averaging of the reconstructed complex amplitude, we extend an already efficient methodology to obtain high precision phase images with a reduced amount of aberrations caused by the microscope objective, and at the same time, we reduce the optical noise of the reconstructed complex amplitude. Using a homemade micro-thin film step surface, our system was calibrated and made traceable to an atomic force microscope (AFM). It is shown that our experimental results, compared to those given by the AFM, reach an axial accuracy of 9.7 nm from a typical phase sample.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo presentamos una metodología para la obtencion de la amplitud compleja de un holograma digital por medio de un microscopio holográfico digital en transmisión usando corrimiento de fase. Como método de reconstrucción se usa el algoritmo de propagación del espectro angular, empleando un arreglo experimental en eje. Esta técnica de reconstrucción elimina de manera automática el orden cero y la imagen gemela del holograma digital. Por medio del método de reconstruccion del holograma de referencia, el metodo del promediado temporal y el metodo de promediado de la distancia focal de la amplitud compleja reconstruida ampliamos una metodología eficiente para obtener imágenes de fase de alta precisión con una cantidad reducida de aberraciones provocadas por el objetivo de microscopio, así como la reduccion de ruido óptico de la amplitud compleja reconstruida. Usando una micro película delgada superficial en forma de escalon hecha en casa como primera muestra, nuestro sistema fue calibrado y con los resultados de un microscopio de fuerza atómica como medio de trazabilidad de la misma muestra. Se muestra que nuestros resultados experimentales comparados con los del microscopio de fuerza atómica alcanzan una precisión axial de 9.7 nm de una muestra típica de fase.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Digital holography]]></kwd>
<kwd lng="en"><![CDATA[aberration compensation]]></kwd>
<kwd lng="en"><![CDATA[computer holography]]></kwd>
<kwd lng="en"><![CDATA[phase retrieval]]></kwd>
<kwd lng="en"><![CDATA[microscopy]]></kwd>
<kwd lng="en"><![CDATA[image reconstruction techniques]]></kwd>
<kwd lng="en"><![CDATA[phase measurement]]></kwd>
<kwd lng="en"><![CDATA[surface measurements]]></kwd>
<kwd lng="en"><![CDATA[roughness]]></kwd>
<kwd lng="es"><![CDATA[Holografía digital]]></kwd>
<kwd lng="es"><![CDATA[compensación de aberraciones]]></kwd>
<kwd lng="es"><![CDATA[holografía por computadora]]></kwd>
<kwd lng="es"><![CDATA[recuperación de fase]]></kwd>
<kwd lng="es"><![CDATA[microscopia]]></kwd>
<kwd lng="es"><![CDATA[técnicas de reconstrucción de imagen]]></kwd>
<kwd lng="es"><![CDATA[medicion de fase]]></kwd>
<kwd lng="es"><![CDATA[medición superficial]]></kwd>
<kwd lng="es"><![CDATA[rugosidad]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>Amplitude and phase recovering from a micro&#150;digital hologram using angular spectrum</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>M. Le&oacute;n*, R. Rodr&iacute;guez&#150;Vera, J.A. Rayas, and S. Calixto</b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i>Centro de investigaciones en &oacute;ptica, A.C. Loma del bosque 115, Le&oacute;n, Guanajuato, 37150, M&eacute;xico, e&#150;mails:*</i><a href="mailto:migue@cio.mx">migue@cio.mx</a>; <a href="mailto:rarove@cio.mx">rarove@cio.mx</a>; <a href="mailto:jrayas@cio.mx">jrayas@cio.mx</a>; <a href="mailto:scalixto@cio.mx">scalixto@cio.mx</a>.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Recibido el 25 de noviembre de 2010    ]]></body>
<body><![CDATA[<br>     Aceptado el 31 de mayo de 2011</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p> 	    <p align="justify"><font face="verdana" size="2">In this paper we present a method to get the complex amplitude of a digital hologram obtained through phase shifting transmission digital holographic microscopy. This is based on the angular spectrum method as a reconstruction algorithm employing an in&#150;line experimental setup. The reconstruction technique automatically eliminates the zero order and the twin images from the digital hologram. By means of a reference hologram reconstruction method, a temporal averaging procedure and a focus distance averaging of the reconstructed complex amplitude, we extend an already efficient methodology to obtain high precision phase images with a reduced amount of aberrations caused by the microscope objective, and at the same time, we reduce the optical noise of the reconstructed complex amplitude. Using a homemade micro&#150;thin film step surface, our system was calibrated and made traceable to an atomic force microscope (AFM). It is shown that our experimental results, compared to those given by the AFM, reach an axial accuracy of 9.7 nm from a typical phase sample.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Digital holography; aberration compensation; computer holography; phase retrieval; microscopy; image reconstruction techniques; phase measurement; surface measurements; roughness.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p> 	    <p align="justify"><font face="verdana" size="2">En este trabajo presentamos una metodolog&iacute;a para la obtencion de la amplitud compleja de un holograma digital por medio de un microscopio hologr&aacute;fico digital en transmisi&oacute;n usando corrimiento de fase. Como m&eacute;todo de reconstrucci&oacute;n se usa el algoritmo de propagaci&oacute;n del espectro angular, empleando un arreglo experimental en eje. Esta t&eacute;cnica de reconstrucci&oacute;n elimina de manera autom&aacute;tica el orden cero y la imagen gemela del holograma digital. Por medio del m&eacute;todo de reconstruccion del holograma de referencia, el metodo del promediado temporal y el metodo de promediado de la distancia focal de la amplitud compleja reconstruida ampliamos una metodolog&iacute;a eficiente para obtener im&aacute;genes de fase de alta precisi&oacute;n con una cantidad reducida de aberraciones provocadas por el objetivo de microscopio, as&iacute; como la reduccion de ruido &oacute;ptico de la amplitud compleja reconstruida. Usando una micro pel&iacute;cula delgada superficial en forma de escalon hecha en casa como primera muestra, nuestro sistema fue calibrado y con los resultados de un microscopio de fuerza at&oacute;mica como medio de trazabilidad de la misma muestra. Se muestra que nuestros resultados experimentales comparados con los del microscopio de fuerza at&oacute;mica alcanzan una precisi&oacute;n axial de 9.7 nm de una muestra t&iacute;pica de fase.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Holograf&iacute;a digital; compensaci&oacute;n de aberraciones; holograf&iacute;a por computadora; recuperaci&oacute;n de fase; microscopia; t&eacute;cnicas de reconstrucci&oacute;n de imagen; medicion de fase; medici&oacute;n superficial; rugosidad.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 42.15.Fr; 61.05.jp; 07.60.Pb; 42.30.Wb.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v57n4/v57n4a4.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Authors would like to recognize the financial support pro&#150;vided by the Council of Science and Technology of the State of Guanajuato (CONCYTEG) under grant No. 09&#150;04&#150;K662&#150;055&#150;A03. Also, Miguel Leon would like recognize the scholarship from CONACyT.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. E. Cuche, P. Marquet, and C. Depeursinge, <i>Appl. Opt.</i> <b>38</b> (1999) 6994.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8370312&pid=S0035-001X201100040000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p> 	    ]]></body>
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