EN ESTE TRABAJO SE PRESENTAN EL DISEÑO Y LA CONSTRUCCIÓN DE UN AUTOCORRELADOR DE PULSOS DE LÁSER DE FEMTOSEGUNDOS, BASADO EN EL PROCESO DE ABSORCIÓN DE DOS FOTONES EN UN DIODO LUMINISCENTE (LED). COMPARADO CON LOS AUTOCORRELADORES TRADICIONALES BASADOS EN CRISTALES NOLINEALES, ESTE AUTOCORRELADOR PRESENTA LAS VENTAJAS DE UN COSTO REDUCIDO, ASÍ COMO DE UNA MAYOR SENCILLEZ EN SU USO Y ALINEACIÓN. SE PRESENTAN LAS TRAZAS DE AUTOCORRELACIÓN DE INTENSIDAD E INTERFEROMÉTRICA OBTENIDAS CON ESTE DISPOSITIVO PARA UN LÁSER DE TITANIO: ZAFIRO CON PULSOS DE MENOS DE 100 FS DE DURACIÓN.AbstractIN THIS WORK, WE PRESENT THE DESIGN AND CONSTRUCTION OF A FEMTOSECOND LASER PULSE AUTOCORRELATOR, BASED ON THE TWO-PHOTON ABSORPTION PROCESS IN A LIGHT EMITTING DIODE (LED). COMPARED WITH TRADITIONAL AUTOCORRELATORS BASED ON NONLINEAR CRYSTALS, THIS AUTOCORRELATOR HAS THE ADVANTAGES OF LOWER COST AND GREATER EASE OF ALIGNMENT. THE INTENSITY AND INTERFEROMETRIC AUTOCORRELATION TRACES OBTAINED WITH THIS DEVICE FOR A TITANIUMSAPPHIRE LASER WITH PULSES THAT ARE LESS THAN 100 FS LONG, ARE ALSO PRESENTED.IN THIS WORK, WE PRESENT THE DESIGN AND CONSTRUCTION OF A FEMTOSECOND LASER PULSE AUTOCORRELATOR, BASED ON THE TWO-PHOTON ABSORPTION PROCESS IN A LIGHT EMITTING DIODE (LED). COMPARED WITH TRADITIONAL AUTOCORRELATORS BASED ON NONLINEAR CRYSTALS, THIS AUTOCORRELATOR HAS THE ADVANTAGES OF LOWER COST AND GREATER EASE OF ALIGNMENT. THE INTENSITY AND INTERFEROMETRIC AUTOCORRELATION TRACES OBTAINED WITH THIS DEVICE FOR A TITANIUMSAPPHIRE LASER WITH PULSES THAT ARE LESS THAN 100 FS LONG, ARE ALSO PRESENTED.