A. Di Lieto
A5038233216- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Solid State Laser Technologies
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Advanced Fiber Laser Technologies
- Optical properties and cooling technologies in crystalline materials
- Spectroscopy and Laser Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Laser Design and Applications
- Geophysics and Sensor Technology
- Astrophysics and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Radio Astronomy Observations and Technology
- Luminescence Properties of Advanced Materials
- High-pressure geophysics and materials
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Laser-Matter Interactions and Applications
- Statistical and numerical algorithms
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2015-2024
University of Pisa
2015-2024
Institute of Polymers, Composites and Biomaterials
2024
Istituto Nanoscienze
2011-2022
National Enterprise for NanoScience and NanoTechnology
2007-2022
Scuola Normale Superiore
1982-2018
University of Siena
2008-2013
Istituto Nazionale per la Fisica della Materia
1996-2010
Advanced Virgo is the project to upgrade interferometric detector of gravitational waves, with aim increasing number observable galaxies (and thus detection rate) by three orders magnitude. The now in an advanced construction phase and assembly integration will be completed end 2015. part a network, alongside two LIGO detectors US GEO HF Germany, goal contributing early waves opening new window observation on universe. In this paper we describe main features outline status construction.
The Virgo detector has now finished its first science run; a mode duty cycle of more than 80% and 4.5 Mpc horizon distance for binary neutron star inspiral sources were achieved. Commissioning breaks organized during the run which permitted improvement sensitivity robustness interferometer against environmental perturbations like bad weather earthquakes. post-run commissioning phase started, with goal preparing next upgrade step detector, Virgo+.
We describe the present state and future evolution of Virgo gravitational wave detector, realized by Collaboration at European Gravitational Observatory, in Cascina near Pisa Italy. summarize basic principles operation design features detector. sensitivity due to a series intermediate upgrades called Virgo+ which is being completed this year includes new monolithic suspensions. scientific potential Finally we discuss plans for second generation Advanced Virgo, introducing its features,...
In the present work we report on growth, spectroscopy and laser results of diode pumped Pr-doped LiYF 4 , LiLuF LiGdF fluoride, scheelite-type structure crystals.We measured polarisation dependent absorption emission properties as well decay time 3 P 0 level.Exploiting 2 around 444 nm, obtained efficient under GaN pumping several transitions from green to near infrared wavelength range.
The Virgo collaboration has just concluded its first long science run (VSR1). In these four months the detector achieved a good duty cycle, larger than 80%, and an average horizon distance for binary neutron star system sources of about 4 Mpc. An intense commissioning activity was resumed after complete to further increase performances prepare Virgo+ upgrades. during last achievements are briefly discussed here.
We report on bulk optical refrigeration of Yb:YLF crystal to a temperature ∼124 K, starting from the ambient. This is achieved by pumping E4-E5 Stark multiplet transition at ∼1020 nm. A lower 119±1 K (∼−154C) with available cooling power 18 mW attained when surrounding reduced 210 K. result within only few degrees minimum achievable our and signifies solid-state laser below National Institute Standards Technology (NIST)-defined cryogenic 123
Virgo is one of the large, ground-based interferometers aimed at detecting gravitational waves. One technical problems limiting its sensitivity caused by light in output beams which backscattered seismically excited surfaces and couples back into main beam interferometer. The resulting noise was thoroughly studied, measured mitigated before Virgo's second science run (VSR2). residual during VSR2, increases periods with a large microseism activity, accurately predicted theoretical model....
Minimum achievable temperature of ~110 K is measured in a 5% doped Yb:YLF crystal at λ = 1020 nm, corresponding to E4-E5 resonance Stark manifold. This measurement excellent agreement with the laser cooling model and was made possible by employing novel sensitive implementation differential luminescence thermometry using balanced photo-detectors.
The Advanced Virgo interferometer is the upgraded version of detector having goal to extend by a factor 10 observation horizon in universe and consequently increase detection rate three orders magnitude. Its installation progress expected be completed late 2015. In this proceeding we will present scheme main challenging technical features give an outline status foreseen time schedule which bring its full operation.
In August 2017, Advanced Virgo joined LIGO for the end of O2 run, leading to first gravitational waves detections with three-detector network. This paper describes calibration and wave strain h(t) reconstruction during O2. The methods are same as ones developed initial detector have already been described in previous publications, this summarizes differences emphasis is put on estimating systematic uncertainties. Three versions signal computed an online version two post-run reprocessed...
We demonstrate passive mode-locking by means of a semiconductor saturable-absorber mirror in diode-pumped Yb:YLF laser. present crystal growth process, spectroscopic measurements, and investigation performance. Pulse trains with minimum duration 196 fs, average power 54 mW repetition rate 55 MHz were obtained. The optical spectrum, centered at 1028 nm, has 7.1-nm bandwidth leading to nearly transform-limited pulses.
The Virgo detector is a kilometer-length interferometer for gravitational wave detection located near Pisa (Italy). During its second science run (VSR2) in 2009, 6 months of data were accumulated with sensitivity close to design. In this paper, the methods used determine parameters estimation and reconstruction are described. main quantities be calibrated frequency response mirror actuation sensing output power. Focus also put on their absolute timing. monitoring calibration parameter...
Abstract Coherent light sources in the visible range are playing important roles our daily life and modern technology, since about 50% of capability human brains is devoted to processing visual information. Visible lasers can be achieved by nonlinear optical process infrared direct lasing gain materials latter has advantages aspects compactness, efficiency, simplicity, etc. However, due lack modulators, directly generated with only a material constrained continuous-wave operation. Here, we...
Optical cooling of a YLF:Yb single crystal to 87 K, well below the minimum achievable temperature predicted from existing theory, has been observed. This discrepancy between theory and data motivated us revisit current model optical refrigeration, in particular critical role parasitic background absorption. Challenging experiments that measured efficiency as function reveal absorption coefficient decreases with temperature, resulting significant enhancement at cryogenic temperatures. These...
An efficient continuous-wave Cr2+-doped ZnSe laser pumped by a Co:MgF2 is experimentally demonstrated. In single-pass pump scheme we observed up to 520 mW at ∼2500 nm in 0.4-nm narrow-band operation, with 52% incident-power slope efficiency, and tuning range between 2180 2800 nm. the multipass also analyzed effect of dual Q-switching action 1.75 2.5 µm Co:MgF2–Cr:ZnSe coupled-cavity oscillator. Finally, report measurement passive losses ground-state absorption lasing wavelength.
We present a systematic study of the crystal field interactions in Li$R$F$_4$, $R$ = Gd, Ho, Er, Tm and Yb, family rare-earth magnets. Using detailed inelastic neutron scattering measurements we have been able to quantify transition energies wavefunctions for each system. This allows us quantitatively describe high-temperature susceptibility series materials make predictions based on mean-field approach low-temperature thermal quantum phase transitions. show that coupling between phonon...
We report on a detailed comparative study of the spectroscopic and thermo-optic properties tetragonal Tm:LiLnF 4 (Ln = Y, Gd, Lu) crystals indicating their suitability for highly-efficient microchip lasers diode-pumped at ~791 nm operating ~1.91 μm.An a-cut 8 at.%Tm:LiYF micro-laser generated 3.1 W linearly polarized output 1904 with slope efficiency η 72% laser threshold only 0.24 W. The internal loss this crystal is as low 0.0011 cm -1 .For at.%Tm:LiGdF 12 at.%Tm:LiLuF lasers, power...
We demonstrate cooling of a 2 micron thick GaAs/InGaP doubleheterostructure to 165 K from ambient using an all-solid-state optical refrigerator.Cooler is comprised Yb 3+ -doped YLF crystal, utilizing 3.5 Watts absorbed power near the E4-E5 Stark manifold transition.©2010 Optical Society America
We present a detection scheme to search for QCD axion dark matter, that is based on direct interaction between axions and electrons explicitly predicted by DFSZ models. The local matter field shall drive transitions Zeeman-split atomic levels separated the rest mass energy $m_a c^2$. Axion-related excitations are then detected with an upconversion involving pump laser converts absorbed ($\sim $ hundreds of $\mu$eV) visible or infrared photons, where single photon established technique....
We demonstrate efficient laser-diode pumped multi-gigahertz (GHz) self-mode-locked praseodymium (Pr3+) visible lasers with broadband spectra from green to deep red for the first time our knowledge. With a Pr3+-doped GdLiF4 crystal, stable pulsed at wavelengths of 522 nm, 607 639 and 720 nm have been obtained repetition rates 2.8 GHz, 3.1 3.0 respectively. The maximum output power was 612 mW slope efficiency 46.9% nm. mode-locking mechanism theoretically analyzed. second-harmonic doubled...