Towards optical attosecond pulses: broadband phase coherence between an ultrafast laser and OPO using lock-tozero CEO stabilization

The carrier-envelope-offset frequencies of the pump, signal, idler and related sum-frequency mixing pulses have been locked to 0 Hz in a 20-fs-Ti:sapphire-pumped optical parametric oscillator, satisfying a critical prerequisite for optical attosecond pulse synthesis

Applications of ultra-short pulse sources in OTDM networks

Novel all-optical and high-speed time-multiplexed space (TMS) switch architectures can be realised with the use of ultra-short pulse sources and ultra-fast all-optical wavelength converters. Example architectures, which only require low speed electronics, are outlined. Experimental results from an associated time-slot interchange architecture demonstrate error-free performance at 40 Gbit/s. The proposed architectures can be used in a WDM/OTDM optical cross-connect node, able to switch circuits in space, wavelength, and time

650MHz-prf-femtosecond Cr4+:forsterite laser with dispersion-compensating GaInNAs SESAM

We report the use of a near-resonant GaInNAs SESAM in a Cr4+:forsterite laser to generate transform-limited 150fs pulses around 1300nm at a repetition-rate of 0.65GHz with average powers up to 270mW. (C) 2010 Optical Society of America</p

An All-Optical Time-Slot Interchange Architecture

A novel, bit-rate scaleable and transparent Time-Slot Interchange architecture is proposed and experimental results demonstrate error-free performance at 40Gbit/s. The proposed architecture can be used in an OTDM-based optical cross-connect node

Characterization of Rare-Earth Oxide Photoactivated Calcium Phosphate Minerals for Resurfacing Teeth

Calcium phosphate (CaP) minerals were synthesized with photo-active erbium oxide (Er O ), and acid-resistant phase mixture of aluminum phosphate (AlPO ) and calcium fluoride (CaF ) at room temperature via precipitation from the aqueous solution of hydrated calcium nitrate Ca(NO ) ·4H O and ammonium hydrogen phosphate (NH ) HPO . The dominant precipitated phases, characterized by X-ray powder diffraction, confirmed the presence of monetite (CaHPO ) and brushite (CaHPO ·2H O) at room temperature. The microstructural analysis showed the presence of platelet-like features of monetite and brushite, which were tested for occlusion of dentinal tubules via irradiation with a 100 fs pulse duration laser, operating at 1520 nm at 2.5 GHz repetition rate. The SEM analysis of dentinal tubule over the occluded surface showed a continuum of 10 μm layer, which covered several 100s of micrometer surface. The results open the opportunity for dentinal tubule occlusion via ultrafast laser sintering using acid-resistant minerals

Cuadernos de pedagogía

Resumen basado en el de la publicación. Pertenece al monográfico: “Otros escenarios de aprendizaje”Vivir unos días al ritmo de la naturaleza, en contacto con una realidad distinta, ayuda a los niños y niñas a abrir sus sentidos, a estar presentes y a potenciar su autonomía, su autoconocimiento y su creatividad. Se narra el desarrollo de una jornada en una granja escuela situada en Granada donde los niños tienen la oportunidad de tener un contacto directo con la naturaleza y los animales. Estas experiencias vitales fortalecen el pensamiento ecológico y conectan a los más pequeños con el medioambiente, algo que les permite conocer de cerca su funcionamiento y aprender a respetar su equilibrio.Biblioteca de Educación del Ministerio de Educación, Cultura y Deporte; Calle San Agustín, 5 - 3 planta; 28014 Madrid; Tel. +34917748000; [email protected]