<?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>S0035-001X2010000400009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Influence of the absorption grating on the diffraction efficiency in thick photovoltaic media in transmission geometry under non linear regimes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes]]></surname>
<given-names><![CDATA[L.M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zúñiga]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magaña]]></surname>
<given-names><![CDATA[L.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo]]></surname>
<given-names><![CDATA[J.G.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Cómputo ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Centro de Investigación en Materiales Avanzados  ]]></institution>
<addr-line><![CDATA[Chihuahua ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2010</year>
</pub-date>
<volume>56</volume>
<numero>4</numero>
<fpage>323</fpage>
<lpage>327</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2010000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2010000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2010000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[With simultaneous phase and absorption gratings, we calculated the contribution of the absorption grating to the total diffraction efficiency in thick samples (&#8776; 1 cm) of iron doped LiNbO3. We considered transmission geometry, with an applied field of 5 kV/cm. First we solved numerically the set of partial, non linear, material rate differential equations. These solutions were used to calculate the energy exchange in two wave mixing. We solved numerically the beam coupling equations along sample thickness, for different values of grating period. For the used value of iron doping, we found that the contribution of the absorption grating is less than 0.02% of the total value of the diffraction efficiency.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Con rejillas simultáneas de fase y de absorción, calculamos la contribución de la rejilla de absorción a la eficiencia total de difracción en muestras gruesas (&#8776;1 centimetro) de LiNbO3 dopado con hierro. Consideramos la geometría de transmisión, con un campo aplicado de 5 kV/cm. Primero resolvimos numéricamente el sistema de ecuaciones diferenciales parciales, no lineales del material. Estas soluciones fueron utilizadas luego para calcular el intercambio de energía en la mezcla de dos ondas. Resolvimos numéricamente las ecuaciones del acoplamiento de los haces a lo largo del grosor de la muestra, para diversos valores del período de la rejilla. Para el valor usado del dopaje de hierro, encontramos que la contribución de la rejilla de absorción es menos de 0.02 % del valor total de la eficiencia de difracción.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Photorefractive gratings]]></kwd>
<kwd lng="en"><![CDATA[absorption gratings]]></kwd>
<kwd lng="en"><![CDATA[diffraction efficiency]]></kwd>
<kwd lng="en"><![CDATA[non linear optics]]></kwd>
<kwd lng="es"><![CDATA[Rejillas fotorrefractivas]]></kwd>
<kwd lng="es"><![CDATA[rejillas de absorción]]></kwd>
<kwd lng="es"><![CDATA[eficiencia de difracción]]></kwd>
<kwd lng="es"><![CDATA[óptica no lineal]]></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>Influence of the absorption grating on the diffraction efficiency in thick photovoltaic media in transmission geometry under non linear regimes</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>L.M. Cervantes&ordf;, A. Z&uacute;&ntilde;iga<sup>b</sup>, L.F. Maga&ntilde;a<sup>c</sup>*, and J.G. Murillo<sup>d</sup></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Escuela Superior de C&oacute;mputo, Instituto Polit&eacute;cnico Nacional, Unidad Profesional Adolfo L&oacute;pez Mateos, M&eacute;xico D.F., 07730 M&eacute;xico. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Escuela Superior de F&iacute;sica y Matem&aacute;ticas, Instituto Polit&eacute;cnico Nacional, Edificio 9, Unidad Profesional Adolfo L&oacute;pez Mateos, M&eacute;xico D.F., 07730 M&eacute;xico. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Instituto de F&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apartado Postal 20&#150;364, M&eacute;xico D.F., 01000 M&eacute;xico. *Phone: +&#91;52&#93;5556225122; FAX: +&#91;52&#93;5556225011.</i> E&#150;mail: <a href="mailto:fernando@fisica.unam.mx">fernando@fisica.unam.mx</a></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>d</sup> Centro de Investigaci&oacute;n en Materiales Avanzados, Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109 Chihuahua, M&eacute;xico.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 29 de abril de 2010    <br> Aceptado el 25 de mayo de 2010</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">With simultaneous phase and absorption gratings, we calculated the contribution of the absorption grating to the total diffraction efficiency in thick samples (&#8776; 1 cm) of iron doped LiNbO<sub>3</sub>. We considered transmission geometry, with an applied field of 5 kV/cm. First we solved numerically the set of partial, non linear, material rate differential equations. These solutions were used to calculate the energy exchange in two wave mixing. We solved numerically the beam coupling equations along sample thickness, for different values of grating period. For the used value of iron doping, we found that the contribution of the absorption grating is less than 0.02% of the total value of the diffraction efficiency.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Photorefractive gratings; absorption gratings; diffraction efficiency; non linear optics.</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">Con rejillas simult&aacute;neas de fase y de absorci&oacute;n, calculamos la contribuci&oacute;n de la rejilla de absorci&oacute;n a la eficiencia total de difracci&oacute;n en muestras gruesas (&#8776;1 centimetro) de LiNbO<sub>3</sub> dopado con hierro. Consideramos la geometr&iacute;a de transmisi&oacute;n, con un campo aplicado de 5 kV/cm. Primero resolvimos num&eacute;ricamente el sistema de ecuaciones diferenciales parciales, no lineales del material. Estas soluciones fueron utilizadas luego para calcular el intercambio de energ&iacute;a en la mezcla de dos ondas. Resolvimos num&eacute;ricamente las ecuaciones del acoplamiento de los haces a lo largo del grosor de la muestra, para diversos valores del per&iacute;odo de la rejilla. Para el valor usado del dopaje de hierro, encontramos que la contribuci&oacute;n de la rejilla de absorci&oacute;n es menos de 0.02 % del valor total de la eficiencia de difracci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Rejillas fotorrefractivas; rejillas de absorci&oacute;n; eficiencia de difracci&oacute;n; &oacute;ptica no lineal.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 42.65.&#150;k; 42.70&#150;a; 42.70.Nq</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/v56n4/v56n4a9.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>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">We thank Direcci&oacute;n General de Asuntos del Personal Acad&eacute;mico for partial funding by the grant IN111807.</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>     ]]></body>
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