Presence of fast quenching mechanisms in Al2O3:Er3+

The measurement of luminescence decay curves and non-saturable absorption in erbium-doped aluminum oxide waveguides reveals the presence of fast quenching effects, leading to a revised value of the microscopic and macroscopic parameters of energy-transfer upconversion

Narrow-Linewidth Distributed Feedback Channel Waveguide Laser in Al2_2O3_3:Er3+^{3+}

We report on the fabrication and characterization of a distributed feedback channel waveguide laser in erbium-doped aluminium oxide on a standard thermally oxidized silicon substrate. Holographically-written surface-relief Bragg gratings have been integrated with the aluminium oxide waveguides via reactive ion etching of a silicon dioxide overlay film. The laser operates at a wavelength of 1545.2 nm and exhibits a threshold of 2.2 mW absorbed pump power, while it produces a maximum output power of 3 mW. The emission is TE polarized and has a Lorentzian linewidth of 1.70±0.58 kHz, which corresponds to a Q-factor of 1.14×E11

Ultra-high, broadband gain in a lattice-engineered, Yb-doped double tungstate channel waveguide

150 dB/cm gain over 55 nm wavelength range between 977-1032 nm is obtained in a 47.5% Yb-doped potassium double tungstate waveguide amplifier. The dependence of luminescence lifetime and gain on Yb concentration is investigated

Per una biografia di Sergio Bettini

Il volume (a cura dell'autrice e di C. Romanelli) pubblica i risultati della ricerca su Sergio Bettini e gli atti del convegno sullo studioso del 2005: il contributo ricostruisce la biografia di Sergio Bettini, basata sulla documentazione dell'Archivio Bettini (conservato presso il Dip. Storia e delle arti ora confluito nel Dip. Filosofia e Beni culturali dell'Univ. Ca' Foscari) e su quella raccolta nell'ambito della ricerca

Disegni nel Trecento veneziano

Esame della casistica dei disegni trecenteschi a Venezia attraverso fonti indirette: i disegni ricordati nell'elenco di Oliviero Forzetta e le mappe di città riprese nell'illustrazione del codice di Paolino da Venezia

Single-Frequency, Narrow-Linewidth Distributed Feedback Waveguide Laser in Al2O3:Er3+ on Silicon

A distributed feedback channel waveguide laser in erbium-doped aluminum oxide on a silicon substrate is reported. The optically pumped laser has a threshold pump power of 15 mW and emits 3 mW in single-frequency operation at 1545.2 nm wavelength with a slope efficiency of 6.2% and linewidth of 15 kHz