<?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>S0035-001X2005000500008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Multi-pass confocal ultra-short pulse amplifier]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-de-la-Cruz]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel-Rojo]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigación Científica y Educación Superior de Ensenada Departamento de Óptica ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>51</volume>
<numero>5</numero>
<fpage>488</fpage>
<lpage>493</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2005000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2005000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2005000500008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present the results obtained in the design and construction of an amplifier system for ultrashort optical pulses. The system is based on the chirped pulse amplification technique (CPA). In this technique, the pulse to be amplified is first stretched in time to lower its peak power; in the next step, the pulse is amplified and it is finally compressed in time to approximately its original duration. Our amplifier stage is very simple, using only 2 spherical mirrors in a confocal configuration to make 8 passes of the signal pulse through the amplifying medium, a 5mm long Ti:Sapphire rod. We report obtaining output pulses with an energy of several &#956;J.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos los resultados obtenidos en el diseño y construcción de un sistema para amplificar pulsos ópticos ultracortos. El sistema está basado en la amplificación de pulsos con modulación temporal de la frecuencia (CPA por sus siglas en inglés). En esta técnica los pulsos a ser amplificados primero son estirados en el tiempo, después se amplifican y finalmente se recomprimen casi hasta recuperar a su duración original. En la etapa amplificadora usamos un diseño muy simple que utiliza solo dos espejos esféricos dispuestos en una configuración confocal que nos permite hacer 8 pasos de la señal por el medio amplificador y una barra de Ti:Zafiro de 5mm de largo. Hasta el momento hemos obtenido pulsos con una energía de varios &#956;J.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Femtoseconds]]></kwd>
<kwd lng="en"><![CDATA[amplifier]]></kwd>
<kwd lng="en"><![CDATA[pulse-compression]]></kwd>
<kwd lng="en"><![CDATA[stretcher]]></kwd>
<kwd lng="es"><![CDATA[Femtosegundos]]></kwd>
<kwd lng="es"><![CDATA[amplificador]]></kwd>
<kwd lng="es"><![CDATA[compresión de pulsos]]></kwd>
<kwd lng="es"><![CDATA[estirado de pulsos]]></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>Multi&#45;pass confocal ultra&#45;short pulse amplifier</b></font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>A. Ruiz&#45;de&#45;la&#45;Cruz and R. Rangel&#45;Rojo</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 &Oacute;ptica, CICESE, Apartado Postal 2732, Ensenada B.C., 22860, M&eacute;xico, e&#45;mail:</i> <a href="mailto:alruiz@cicese.mx">alruiz@cicese.mx</a>, <a href="mailto:rrangel@cicese.mx">rrangel@cicese.mx</a><a href="mailto:rrangel@cicese.mx"></a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 23 de febrero de 2005.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 9 de mayo de 2005.</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 present the results obtained in the design and construction of an amplifier system for ultrashort optical pulses. The system is based on the chirped pulse amplification technique (CPA). In this technique, the pulse to be amplified is first stretched in time to lower its peak power; in the next step, the pulse is amplified and it is finally compressed in time to approximately its original duration. Our amplifier stage is very simple, using only 2 spherical mirrors in a confocal configuration to make 8 passes of the signal pulse through the amplifying medium, a 5mm long Ti:Sapphire rod. We report obtaining output pulses with an energy of several <i>&#956;</i>J.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Femtoseconds; amplifier; pulse&#45;compression; stretcher.</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">Presentamos los resultados obtenidos en el dise&ntilde;o y construcci&oacute;n de un sistema para amplificar pulsos &oacute;pticos ultracortos. El sistema est&aacute; basado en la amplificaci&oacute;n de pulsos con modulaci&oacute;n temporal de la frecuencia (CPA por sus siglas en ingl&eacute;s). En esta t&eacute;cnica los pulsos a ser amplificados primero son estirados en el tiempo, despu&eacute;s se amplifican y finalmente se recomprimen casi hasta recuperar a su duraci&oacute;n original. En la etapa amplificadora usamos un dise&ntilde;o muy simple que utiliza solo dos espejos esf&eacute;ricos dispuestos en una configuraci&oacute;n confocal que nos permite hacer 8 pasos de la se&ntilde;al por el medio amplificador y una barra de Ti:Zafiro de 5mm de largo. Hasta el momento hemos obtenido pulsos con una energ&iacute;a de varios <i>&#956;</i>J.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Femtosegundos; amplificador; compresi&oacute;n de pulsos; estirado de pulsos.</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: 42.60; 42.65</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/v51n5/v51n5a8.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>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. A. Zoubir, L. Shah, K. Richardson, and M. 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