<?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>S0035-001X2012000200007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Non-stationary response of photorefractive crystal under an external sinusoidal electric field]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salas-Torres]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zúñiga-Segundo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Magaña-Solís]]></surname>
<given-names><![CDATA[L.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Escuela Superior de Física y Matemáticas Departamento de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2012</year>
</pub-date>
<volume>58</volume>
<numero>2</numero>
<fpage>160</fpage>
<lpage>165</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2012000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2012000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2012000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We calculated the non-stationary holographic current arising in a photorefractive crystal illuminated by a vibrating sinusoidal pattern along with an external sinusoidal electric field applied to the sample. We first solved numerically the set of nonlinear material rate differential equations to find the full overall space charged field and the mobile carrier density for a photorefractive BSO crystal. With these results we calculated the photocurrent, which is found to be in good agreement with corresponding values obtained from holographic experiments performed with similar samples.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Calculamos la corriente que fluye en un cristal fotorefractivo cuando es iluminado por un patrón de interferencia móvil junto con un campo eléctrico externo sinusoidal. Resolvemos primeramente las ecuaciones diferenciales del cristal fotorefractivo BSO con el fin de encontrar el campo de carga espacial y la densidad de portadores móviles. Con estos resultados calculamos la corriente que fluye en el medio, encontramos una buena concordancia entre los valores obtenidos y los reportados en experimentos con muestras similares.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Photorefractive gratings]]></kwd>
<kwd lng="en"><![CDATA[photo-EMF]]></kwd>
<kwd lng="en"><![CDATA[non-linear optics]]></kwd>
<kwd lng="es"><![CDATA[Rejillas fotorrefractivas]]></kwd>
<kwd lng="es"><![CDATA[foto-FEM]]></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>Non&#150;stationary response of photorefractive crystal under an external sinusoidal electric field</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>O. Salas&#150;Torres<sup>a</sup>, A. Z&uacute;&ntilde;iga&#150;Segundo<sup>a</sup>, and L.F. Maga&ntilde;a&#150;Sol&iacute;s<sup>b</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Departamento de F&iacute;sica, Escuela Superior de F&iacute;sica y Matem&aacute;ticas, Edificio 9, Unidad Profesional Adolfo L&oacute;pez Mateos, 07738, M&eacute;xico, D.F., Mexico. </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</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.</i></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 abril de 2011.    ]]></body>
<body><![CDATA[<br> Aceptado el 2 de marzo de 2012.</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">We calculated the non&#150;stationary holographic current arising in a photorefractive crystal illuminated by a vibrating sinusoidal pattern along with an external sinusoidal electric field applied to the sample. We first solved numerically the set of nonlinear material rate differential equations to find the full overall space charged field and the mobile carrier density for a photorefractive BSO crystal. With these results we calculated the photocurrent, which is found to be in good agreement with corresponding values obtained from holographic experiments performed with similar samples.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Photorefractive gratings; photo&#150;EMF; non&#150;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">Calculamos la corriente que fluye en un cristal fotorefractivo cuando es iluminado por un patr&oacute;n de interferencia m&oacute;vil junto con un campo el&eacute;ctrico externo sinusoidal. Resolvemos primeramente las ecuaciones diferenciales del cristal fotorefractivo BSO con el fin de encontrar el campo de carga espacial y la densidad de portadores m&oacute;viles. Con estos resultados calculamos la corriente que fluye en el medio, encontramos una buena concordancia entre los valores obtenidos y los reportados en experimentos con muestras similares.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Rejillas fotorrefractivas; foto&#150;FEM; &oacute;ptica no lineal.</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: 42.70.Nq; 42.40.Eq; 42.40.Pa; 78.20.Jq</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/v58n2/v58n2a7.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>6. Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">A.Z.S. would like to thank S. Barraza&#150;Lopez (UARK), A. Khomenko and N. Korneev for their fruitful discussions, as well as H. Moya&#150;Cessa for his hospitality at INAOE where these ideas were developed. We thank SIP&#150;IPN grant 20120303.</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. M.P. Petrov, I.A. Sokolov, S.I. Stepanov, and G.S. Trofimov, J <i>Appl.Phys. </i><b>68</b> (1990)216.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8377353&pid=S0035-001X201200020000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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