A5014916350- Solid State Laser Technologies
- Luminescence Properties of Advanced Materials
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Glass properties and applications
- Optical properties and cooling technologies in crystalline materials
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Terahertz technology and applications
- Inorganic Fluorides and Related Compounds
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Photonic Crystal and Fiber Optics
- Photonic Crystals and Applications
- Semiconductor Lasers and Optical Devices
- Plant and animal studies
- Advanced MEMS and NEMS Technologies
- Advanced MRI Techniques and Applications
- Quantum Information and Cryptography
- Advanced Fiber Optic Sensors
- Quantum optics and atomic interactions
- Laser-induced spectroscopy and plasma
- Advanced Frequency and Time Standards
- Forensic Fingerprint Detection Methods
University of Pisa
2015-2025
Istituto Nanoscienze
2015-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2006-2025
National Research Council
2020-2021
Istituto Nazionale di Fisica Nucleare
2007-2020
National Enterprise for NanoScience and NanoTechnology
2003-2019
Fondazione Stella Maris
2016
Laboratoire de physique des lasers
2010
Istituto Nazionale per la Fisica della Materia
1998-2008
University of Parma
2005
Piezoelectric polymers are promising energy materials for wearable and implantable applications replacing bulky batteries in small flexible electronics. Therefore, many research studies focused on understanding the behavior of at a molecular level designing new polymer-based generators using polyvinylidene fluoride (PVDF). In this work, we investigated influence voltage polarity ambient relative humidity electrospinning PVDF energy-harvesting applications. A multitechnique approach combining...
Single-photon sources are important for integrated photonics and quantum technologies, can be used in key distribution, computing, sensing. Color centers the solid state a promising candidate development of next generation single-photon devices. They point defects crystal lattice that absorb emit light at given wavelengths single photons with high efficiency. The landscape color has changed abruptly recent years, identification wider set emergence new solid-state platforms room-temperature...
We have exploited the broad absorption and emission bandwidth of laser crystal Ca/sub 3/(NbGa)/sub 2-x/Ga/sub 3/O/sub 12/ doped with Nd/sup 3+/ to develop a tunable mode locked diode-pumped 1.06 /spl mu/m laser. also present fluorescence excitation spectra at different temperatures from 10 298 K. The spontaneous transition probabilities, branching ratios, radiative lifetime are calculated by means Judd-Ofelt theory compared experimental results. stimulated cross-sections most important...
Terahertz spectroscopy is a perfect tool to investigate the electronic intraband conductivity of graphene, but phenomenological model (Drude-Smith) often needed describe disorder. By studying THz response isotropically strained polycrystalline graphene and using fully atomistic computational approach fit results, we demonstrate here connection between Drude-Smith parameters microscopic behavior. Importantly, clearly show that strain-induced changes in originate mainly from increased...
In this work, we investigated the potential of Eu3+/Dy3+-codoped Y2Sn2O7 fluorescent nanophosphors to visualize latent fingermarks. We prepared these with various doping concentrations by conventional coprecipitation reaction. The crystal structure, morphology, luminescence properties, and energy transfer mechanisms were studied. crystalline phase was characterized X-ray diffraction structure refinement using Rietveld method. XRD measurements showed that samples crystallized in pure single...
Integrated photonics on Silicon-On-Insulator (SOI) substrates is a well developed research field that has already significantly impacted various fields, such as quantum computing, micro sensing devices, biosensing, and high-rate communications. Although quite complex circuits can be made with technology, everything based few ’building blocks’ which are then combined to form more circuits. This review article provides detailed examination of the state art integrated photonic building blocks...
In this work we report the spectroscopy and laser results of several Thulium doped BaY(2)F(8) single crystals grown using Czochralski technique. The doping concentration is between 2at.% 18at.%. We performed room temperature experiments pumping samples with a diode at 789 nm obtaining 61% as maximum optical-to-optical efficiency output power 290 mW minimum lasing threshold 26 mW. wavelength changed dopant from 1927 up to 2030 nature transition purely electronic vibronic, accordingly.
Spectroscopic properties of thulium-doped germanate, silica, and phosphate glasses were measured compared since such are interest as materials for fiber lasers in the eye-safe wavelength region. F43 excited state fluorescence decay dynamics was investigated at temperatures from 8to300K results revealed a strong dependence lifetime on host matrix. The temperature-dependent stimulated emission cross section obtained by using Fuchtbauer–Ladenburg technique. In glass fluorescent is short, making...
The synthesis and spectroscopic investigation of Pr(3+):YF(3) nanoparticles with nominal concentration between 0.05% 5 at% Pr(3+) are reported. emission in the visible range spectrum is investigated at room temperature 10 K as well time resolved spectroscopy a function concentration. upconverted from orange to blue region observed time-resolved emissions discussed doping level. A careful analysis decays permits identification main energy-transfer mechanisms that determine population excited...
Plant water resource management is one of the main future challenges to fight recent climatic changes. The knowledge plant content could be indispensable for saving strategies. Terahertz spectroscopic techniques are particularly promising as a non-invasive tool measuring leaf content, thanks high predominance contribution total absorption. quantum cascade lasers (THz QCL) most successful sources THz radiation. Here we present new method which improves precision by combining transmission...
The letter reports on upconverted orange (607.5 nm, P03→3H6) and red (638.7 P03→3F2) laser oscillation at room temperature observed in Pr3+, Yb3+:BaY2F8 under excitation 822 or 841 nm 300 K. upconversion mechanism that populates the emitting level is an avalanche mechanism. Output powers up to 55 mW slope efficiencies 27% were demonstrated 607.5 nm. At 638.7 maximum output power was 26 with a efficiency of about 13.5%.
The optical properties of KLa(MoO4)2 crystals doped with Nd3+ are investigated at temperatures in the range 10–300 K. spontaneous transition probabilities, branching ratios, and radiative lifetime calculated framework Judd–Ofelt theory compared experimental results for 4F3/2 emitting level. Moreover, observed splittings multiplets reliably reproduced by a crystal-field calculation. structural disorder this crystal causes substantial broadening emission bands. This fact high cross-section...
Continuous-wave laser action at ∼2 µm is demonstrated in a Tm–Ho:KYF4 single crystal room temperature. Crystal growth, spectroscopic measurements, and results are presented. An output power excess of 250 mW obtained with tuning range 99 nm, the largest ever published, to our knowledge, for Tm–Ho any crystalline host.
The optical spectra of the BaY2F8:Dy3+ laser crystal have been investigated in 5000–30 000 cm−1 range. Judd–Ofelt parametrization scheme has applied to analysis room temperature absorption spectra. calculated radiative lifetime 4F9/2 state is 1.48 ms. Decay curves visible emission measured as a function for two different Dy3+ concentrations (0.5 and 4.4%). In case diluted profiles are single exponential with decay times consistent lifetime. concentrated not they obey Inokuti–Hirayama model...
Since the 1980s, researchers have taken giant steps in understanding how to use quantum mechanics for solving real problems—for example, making a computer that works according laws of mechanics. In recent decades, tried develop platform information and computation can be integrated into digital telecom technologies without need cryogenic environment. The current status research field photonics will reviewed. A review most common photonic platforms given, together with main achievements...
A novel BaY2F8 crystal doped with thulium ions is grown and extensively investigated. Owing to the large number of vibronic levels a favorable electron-phonon coupling, extremely wide absorption emission bands around 1.9 microm are observed. room-temperature Tm:BaY2F8 laser tunable over 210-nm interval, from 1849 2059 nm, demonstrated.
The detailed polarized spectroscopic investigation of I11∕24 and I13∕24 states Er3+ ions in Czochralski-grown NaLa(MoO4)2 single crystals doped with codoped Ce3+ as a function cerium concentration is presented. main results room-temperature lifetime show that the reduces by about 50 times from solely Er-doped sample to crystal 50at.% Ce, while same experimental conditions, level less than two most heavily Ce sample. This result looks very promising point view obtaining low-threshold 1.5-μm...