<?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>1390-0129</journal-id>
<journal-title><![CDATA[Revista Politécnica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Politéc. (Quito)]]></abbrev-journal-title>
<issn>1390-0129</issn>
<publisher>
<publisher-name><![CDATA[Escuela Politécnica Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1390-01292019000300007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Propiedades Ópticas no lineales en Señales de Mezcla de Cuatro Ondas: Consideraciones Estocásticas del Solvente y Difusión Espectral]]></article-title>
<article-title xml:lang="en"><![CDATA[Nonlinear Optical Properties in Four-Wave Mixing Signals: Stochastic Considerations of Solvent and Spectral Diffusion]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lascano]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costa-Vera]]></surname>
<given-names><![CDATA[Cesar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela Politécnica Nacional  ]]></institution>
<addr-line><![CDATA[ Quito]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2019</year>
</pub-date>
<volume>43</volume>
<numero>2</numero>
<fpage>7</fpage>
<lpage>20</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S1390-01292019000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S1390-01292019000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S1390-01292019000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Usando las ecuaciones Ópticas de Bloch y considerando un sistema molecular que interactúa con un reservorio térmico, derivamos expresiones analíticas para las propiedades ópticas no lineales en la espectroscopia de mezcla de cuatro ondas. En este trabajo se introducen diferentes metodologías para el estudio de las polarizaciones macroscópicas y susceptibilidades ópticas no lineales. En un sistema de dos niveles, hemos considerado una frecuencia dependiente del tiempo para describir los efectos colectivos del reservorio térmico, cuya manifestación es el ensanchamiento del nivel superior según una función aleatoria prescrita. Aquí, las respuestas ópticas son calculadas mediante una metodología basada en el promedio de la coherencia obtenida por la resolución de las ecuaciones de Bloch ópticas estocásticas. Evaluamos las susceptibilidades ópticas a diferentes frecuencias, representadas como superficies numéricas para el comportamiento de las respuestas ópticas, en función del factor de desintonización de frecuencias bombeo-prueba, y de la intensidad del ruido. Se estudian los tiempos de relajación utilizando las propiedades de simetría de las respuestas ópticas y los efectos de la difusión espectral en la susceptibilidad no lineal de tercer orden para sistemas cuánticos de dos y tres estados. Los resultados presentados en este trabajo muestran aplicaciones potenciales para la caracterización de sistemas moleculares complejos a través de sus propiedades ópticas no lineales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Using the Optical Bloch equations, and considering a molecular system interacting with a thermal reservoir in Four-wave mixing spectroscopy, we derive analytical expressions for the nonlinear optical properties. In this work, we introduce different methodologies for the study of the macroscopic polarizations and nonlinear optical susceptibilities. In a two-level system, we have considered the collective effects of the thermal reservoir as a time dependent frequency, whose manifestation is the broadening of the upper level according to a prescribed random function. Here, the optical responses calculated through a methodology based on the averaging of the coherence obtained by the resolution of the optical stochastic Bloch equations. We were able to calculate the optical susceptibilities at different frequencies, depicted as numerical surfaces for the behavior of the optical responses, as function of the pump- and probe-frequency detuning factor and the strength of the noise source. Relaxation times using symmetry properties of the optical responses, effects of spectral diffusion on the third order nonlinear susceptibility for two- and three-level quantum systems, are studied. The results presented in this work show potential applications for the optical characterization of complex molecular systems.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[susceptibilidad óptica]]></kwd>
<kwd lng="es"><![CDATA[propiedades absortivas y dispersivas]]></kwd>
<kwd lng="es"><![CDATA[mezcla de cuatro ondas]]></kwd>
<kwd lng="en"><![CDATA[Optical susceptibility]]></kwd>
<kwd lng="en"><![CDATA[absorptive and dispersive properties]]></kwd>
<kwd lng="en"><![CDATA[four-wave mixing]]></kwd>
</kwd-group>
</article-meta>
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