<?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>S0035-001X2010000200008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Two methods to determine the Hermite-Gaussian beam radius by means of aperiodic rulings]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mata-Mendez]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas Departamento de Física]]></institution>
<addr-line><![CDATA[ Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<volume>56</volume>
<numero>2</numero>
<fpage>141</fpage>
<lpage>146</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2010000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2010000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2010000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We study the diffraction of Hermite-Gaussian beams by aperiodic rulings by means of the Rayleigh-Sommerfeld theory in the scalar diffraction regime. We extend to Hermite-Gaussian beams the results of a previous paper where Gaussian beams were considered [J. Opt. Soc. Am. A 25 (2008) 2743]. The transmitted power and the normally diffracted energy are analyzed as a function of the beam radius. Two methods to determine the Hermite-Gaussian beam radius by means of aperiodic rulings are proposed. These two methods are based on the maximum and minimum transmitted power, and in the normally diffracted energy.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En la región escalar estudiamos la difracción de haces Hermite-Gauss con redes de difracción aperiódicas mediante la Teoría de Rayleigh-Sommerfeld. Extendemos a haces Hermite-Gauss los resultados previamente publicados para haces Gaussianos [J. Opt. Soc. Am. A 25 (2008) 2743]. La energía total transmitida y la energía normalmente difractada son analizadas como función del radio de los haces. Se proponen dos métodos para determinar el radio de haces Hermite-Gauss mediante redes de difracción aperiódicas. Estos dos métodos están basados en el máximo y el mínimo de la energía total transmitida y en la energía normalmente difractada.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Diffraction]]></kwd>
<kwd lng="en"><![CDATA[gratings]]></kwd>
<kwd lng="es"><![CDATA[Difracción]]></kwd>
<kwd lng="es"><![CDATA[redes de difracción]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Two methods to determine the Hermite&#150;Gaussian beam radius by means of aperiodic rulings</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>O. Mata&#150;Mendez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Departamento de F&iacute;sica, Escuela Superior de F&iacute;sica y Matem&aacute;ticas, Instituto Polit&eacute;cnico Nacional, 07738 Zacatenco, Distrito Federal, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 31 de julio de 2009    <br> Aceptado el 18 de enero de 2010</font></p>     ]]></body>
<body><![CDATA[<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">We study the diffraction of Hermite&#150;Gaussian beams by aperiodic rulings by means of the Rayleigh&#150;Sommerfeld theory in the scalar diffraction regime. We extend to Hermite&#150;Gaussian beams the results of a previous paper where Gaussian beams were considered <i>&#91;J. Opt. Soc. Am. A </i>25 (2008) 2743&#93;. The transmitted power and the normally diffracted energy are analyzed as a function of the beam radius. Two methods to determine the Hermite&#150;Gaussian beam radius by means of aperiodic rulings are proposed. These two methods are based on the maximum and minimum transmitted power, and in the normally diffracted energy.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Diffraction; gratings.</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 la regi&oacute;n escalar estudiamos la difracci&oacute;n de haces Hermite&#150;Gauss con redes de difracci&oacute;n aperi&oacute;dicas mediante la Teor&iacute;a de Rayleigh&#150;Sommerfeld. Extendemos a haces Hermite&#150;Gauss los resultados previamente publicados para haces Gaussianos &#91;<i>J. Opt. Soc. Am. A </i>25 (2008) 2743&#93;. La energ&iacute;a total transmitida y la energ&iacute;a normalmente difractada son analizadas como funci&oacute;n del radio de los haces. Se proponen dos m&eacute;todos para determinar el radio de haces Hermite&#150;Gauss mediante redes de difracci&oacute;n aperi&oacute;dicas. Estos dos m&eacute;todos est&aacute;n basados en el m&aacute;ximo y el m&iacute;nimo de la energ&iacute;a total transmitida y en la energ&iacute;a normalmente difractada.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Difracci&oacute;n; redes de difracci&oacute;n. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 42.25.Fx; 42.10.H.C</font></p>     ]]></body>
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