<?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>S0035-001X2016000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efectos del solvente en la respuesta óptica de un sistema de dos niveles]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Izquierdo]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[L.G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costa-Vera]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Secretaría Nacional de Educación Superior, Ciencia, Tecnología e Innovación Prometeo Project ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Simón Bolívar Departamento de Química ]]></institution>
<addr-line><![CDATA[Caracas Distrito Federal]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Grupo Ecuatoriano para el estudio Experimental y Teórico de Nanosistemas  ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2016</year>
</pub-date>
<volume>62</volume>
<numero>1</numero>
<fpage>10</fpage>
<lpage>19</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2016000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2016000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2016000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo fueron modelados los efectos del reservorio térmico sobre las propiedades (ópticas no lineales absortivas y dispersivas de un sistema molecular de dos niveles en presencia de campos electromagnéticos clásicos. Los efectos colectivos del reservorio térmico son modelados como una frecuencia dependiente del tiempo, manifestada en el ensanchamiento del nivel superior, de acuerdo a una función aleatoria prescrita. Expresiones analíticas fueron obtenidas para las susceptibilidades no lineales inducidas y las propiedades ópticas, usando ecuaciones de Bloch ópticas estocásticas. Cálculos numéricos se llevaron a cabo para construir las superficies correspondientes a estas propiedades ópticas como una función de la desintonización de frecuencias bombeo-prueba, las relaciones entre los tiempos de relajación longitudinal y transversal, y la concentración molecular de soluto. Finalmente, se observa una atenuación de estas respuestas ópticas por los efectos de solvente y la alta intensidad del bombeo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this work, the thermal reservoir effects over the absorptive and dispersive nonlinear optical properties of a two-level molecular system in presence of classical electromagnetic fields, were modeled. The collective effects proper of the thermal reservoir are modeled as a time dependent frequency, whose manifestation is the broadening of the upper level according to a prescribed random function. Using the stochastic optical Bloch equations, analytical expression for the nonlinear induced susceptibilities and absorptive and dispersive optical properties, were obtained. Numerical calculations were carried out to construct surfaces corresponding to these optical properties as a function of the pump-probe frequency detuning, relationships between the longitudinal and transversal relaxation times, and molecular concentration of solute. Finally, we see an attenuation of these optical responses by the solvent effects and the high pump-intensity]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Procesos estocásticos]]></kwd>
<kwd lng="es"><![CDATA[propiedades ópticas]]></kwd>
<kwd lng="es"><![CDATA[ecuaciones de Bloch]]></kwd>
<kwd lng="en"><![CDATA[Stochastic processes]]></kwd>
<kwd lng="en"><![CDATA[optical properties]]></kwd>
<kwd lng="en"><![CDATA[Bloch equations]]></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="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Efectos del solvente en la respuesta &oacute;ptica de un sistema de dos niveles</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>J.L. Paz<sup>a,b,c,*</sup>, M. Izquierdo<sup>c</sup>, L.G. Rodr&iacute;guez<sup>a,b</sup> and C. Costa&#45;Vera<sup>b,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><sup>a</sup> Secretar&iacute;a Nacional de Educaci&oacute;n Superior, Ciencia, Tecnolog&iacute;a e Innovaci&oacute;n, Prometeo Project, Quito, Ecuador. *</i> e&#45;mail: <a href="mailto:jlpaz@usb.ve">jlpaz@usb.ve</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Departamento de F&iacute;sica, Escuela Polit&eacute;cnica Nacional, Ladr&oacute;n de Guevara, E11&#45;253, 170517, Apartado Postal 17&#45;12&#45;866, Quito, Ecuador.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Departamento de Qu&iacute;mica, Universidad Simon Bol&iacute;var, Apartado Postal 89000, Caracas 1086, Venezuela.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>d</sup> Grupo Ecuatoriano para el estudio Experimental y Te&oacute;rico de Nanosistemas, Diego de Robles y V&iacute;a Interoce&aacute;nica, USFQ, N104&#45;E, Quito, Ecuador.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Received 28 July 2015;    <br> 	accepted 13 October 2015</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 fueron modelados los efectos del reservorio tÃ©rmico sobre las propiedades (Ã³pticas no lineales absortivas y dispersivas de un sistema molecular de dos niveles en presencia de campos electromagnÃ©ticos clÃ¡sicos. Los efectos colectivos del reservorio tÃ©rmico son modelados como una frecuencia dependiente del tiempo, manifestada en el ensanchamiento del nivel superior, de acuerdo a una funci&oacute;n aleatoria prescrita. Expresiones anal&iacute;ticas fueron obtenidas para las susceptibilidades no lineales inducidas y las propiedades Ã³pticas, usando ecuaciones de Bloch Ã³pticas estocÃ¡sticas. CÃ¡lculos numÃ©ricos se llevaron a cabo para construir las superficies correspondientes a estas propiedades Ã³pticas como una funciÃ³n de la desintonizaciÃ³n de frecuencias bombeo&#45;prueba, las relaciones entre los tiempos de relajaciÃ³n longitudinal y transversal, y la concentraciÃ³n molecular de soluto. Finalmente, se observa una atenuaciÃ³n de estas respuestas Ã³pticas por los efectos de solvente y la alta intensidad del bombeo.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Procesos estocÃ¡sticos; propiedades Ã³pticas; ecuaciones de Bloch.</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>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">In this work, the thermal reservoir effects over the absorptive and dispersive nonlinear optical properties of a two&#45;level molecular system in presence of classical electromagnetic fields, were modeled. The collective effects proper of the thermal reservoir are modeled as a time dependent frequency, whose manifestation is the broadening of the upper level according to a prescribed random function. Using the stochastic optical Bloch equations, analytical expression for the nonlinear induced susceptibilities and absorptive and dispersive optical properties, were obtained. Numerical calculations were carried out to construct surfaces corresponding to these optical properties as a function of the pump&#45;probe frequency detuning, relationships between the longitudinal and transversal relaxation times, and molecular concentration of solute. Finally, we see an attenuation of these optical responses by the solvent effects and the high pump&#45;intensity.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Stochastic processes; optical properties; Bloch equations.</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/v62n1/v62n1a3.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>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. S. Mukamel, <i>Principles of Nonlinear optical spectroscopy,</i> Oxford University Press, (New York, USA, 1999).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8407385&pid=S0035-001X201600010000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. S. Mukamel, R. Loring, <i>J. Opt. Soc. Am. B.</i> <b>3</b> (1986) 595.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8407387&pid=S0035-001X201600010000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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