Ultrashort Q-switched pulses from a passively mode-locked distributed Bragg reflector semiconductor laser

A compact semiconductor mode-locked laser (MLL) is presented that demonstrates strong passive Q-switched mode-locking over a wide range of drive conditions. The Q-switched frequency is tunable between 1 and 4 GHz for mode-locked pulses widths around 3.5 ps. The maximum ratio of peak to average power of the pulse-train is >120, greatly exceeding that of similarly sized passively MLLs

Monolithically integrated DFB lasers for tunable and narrow linewidth millimeter-wave generation

A monolithic optoelectronic device for the generation of tunable and narrow linewidth millimeter-wave signals is presented. The device consists of three mutually injected distributed feedback lasers whose emission frequencies are stabilized via a four-wave mixing process. Their beating on a high-speed photodetector generates a narrow linewidth electrical signal that is continuously tunable over several tens of gigahertz

Generation of picosecond pulses over a 40-nm wavelength range using an array of distributed Bragg grating mode-locked lasers

A set of distributed Bragg Reflector mode-locked semiconductor lasers are presented that generate picosecond pulses over a spectral range of 40 nm on a single chip. The same technology is used to realize an integrated laser with two separate Bragg gratings coupled into a common gain and saturable absorption section. This laser is shown to lock together the two spectral slices from each grating in a single pulse train

Bathymetric map of Lago Fagnano (Tierra del Fuego Island)

We present a general bathymetric map of Lago Fagnano, the largest ice-free lake of the Southern Hemisphere, located in the central part of the Tierra del Fuego Island. The map has been obtained compiling all the available bathymetric soundings and depth-converted high-resolution seismic profiles, collected in the course of several geophysical campaigns. The lake occupies a 110-km long, E-W trending tectonic depression within the southernmost tip of the Andean Cordillera, where the South America-Scotia plate boundary traverses the Tierra del Fuego Island. The map allows us to identify the main morpho-bathymetric features of Lago Fagnano. The lake floor is divided into two principal sectors of different water depths, separated by a main shoal located in the central part of the lake. Maximum water depth (206 m) is found in the eastern part, whereas water depths in the western half do not exceed 165 m. In this paper, we describe the geometry and the general morphological characteristics of the basin, which was generated by a combination of distinct tectonic processes, and later superposed by Late Quaternary glacial and glacio-lacustrine dynamic events.Fil: Zanolla, C.. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; ItaliaFil: Lodolo, E.. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale ; ItaliaFil: Lippai, Horacio Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Instituto de Geofísica "Daniel Valencio"; ArgentinaFil: Tassone, Alejandro Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Instituto de Geofísica "Daniel Valencio"; ArgentinaFil: Menichetti, M.. Università di Urbino; ItaliaFil: Baradello, L.. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; ItaliaFil: Grossi, H. L.. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale; ItaliaFil: Hormaechea, Jose Luis. Estación Astronomica de Río Grande; Argentin

All-optical directional switching in bistable semiconductor-ring lasers

We investigate the operation of directionally bistable semiconductor-ring lasers as all-optical flip-flops. We demonstrate fast switching between the two lasing directions by injection of optical pulses acting as set and reset control signals with switching times as fast as 20 ps, delay times as short as 60 ps, and switching energy of 150 fJ

« La grâce de montrer son âme dans le vêtement » Scrivere di tessuti, abiti, accessori. Studi in onore di Liana Nissim

Eminente francesista, Liana Nissim ha dedicato la sua intensa attività di ricerca al XIX secolo, in particolare a Gustave Flaubert e Stéphane Mallarmé. I suoi studi si sono concentrati anche sulle letterature francofone dell’Africa Nera e del Québec, che ha contribuito a introdurre in Italia e a diffondere su scala internazionale. Questo trittico di volumi «La grâce de montrer son âme dans le vêtement». Scrivere di tessuti, abiti e accessori illustra e approfondisce in molteplici direzioni una tematica a lei cara e ampiamente presente nei suoi lavori. Tramite la ricchezza delle metodologie e delle prospettive critiche, la comunità scientifica che ha condiviso con lei la passione per la ricerca e la dedizione alla vita universitaria vuole renderle un omaggio riconoscente