A5102003860- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Luminescence Properties of Advanced Materials
- Spectroscopy and Laser Applications
- Optical properties and cooling technologies in crystalline materials
- Photorefractive and Nonlinear Optics
- Cold Atom Physics and Bose-Einstein Condensates
- Glass properties and applications
- Laser-Matter Interactions and Applications
- Molecular Spectroscopy and Structure
- Photonic Crystal and Fiber Optics
- Atmospheric Ozone and Climate
- Semiconductor Lasers and Optical Devices
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Solid-state spectroscopy and crystallography
- Photonic and Optical Devices
- Inorganic Fluorides and Related Compounds
- Perovskite Materials and Applications
- Advanced Frequency and Time Standards
- Spectroscopy and Quantum Chemical Studies
- Molecular spectroscopy and chirality
- Dark Matter and Cosmic Phenomena
University of Pisa
2015-2024
Istituto Nanoscienze
2013-2022
National Enterprise for NanoScience and NanoTechnology
2005-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2004-2019
Changchun University of Science and Technology
2011
Istituto Nazionale per la Fisica della Materia
1998-2010
Fukuda Denshi (Japan)
2010
Nello Carrara Institute of Applied Physics
2010
Czech Academy of Sciences, Institute of Physics
2010
Scuola Normale Superiore
1993-2008
We present laser results obtained from a Dy³⁺-Tb³⁺ co-doped LiLuF₄ crystal, pumped by blue emitting InGaN diode, aiming for generation of compact 578 nm source. exploit the yellow Dy³⁺ transition ⁴F(9/2)⇒⁶H(13/2) to generate emission. The lifetime lower level is quenched, via energy transfer, Tb³⁺ ions in fluoride crystal. report growth technique, spectroscopic study, and room temperature continuous wave hemispherical cavity at 574 nm, with highly reflective output coupler nm. A very...
We demonstrate efficient continuous-wave (CW) and passively Q-switched Tm:LiLuF(4) laser operation near 1.9 μm. The CW slope efficiency reached 54.8% with respect to absorbed power. Stable passive Q-switching Cr(2+):ZnS saturable absorbers resulted in minimum pulse duration of 7.6 ns maximum energy peak power 1.26 mJ 166 kW, respectively.
In this work we investigate the power scaling of diode-pumped Pr:LiLuF 4 waveguide lasers produced by direct femtosecond writing. The waveguides studied consisted in depressed cladding with different geometries. We observed laser emission at 604 nm, achieving a maximum output 275 mW and slope efficiency 40%, 721 demonstrating 310 50%. Moreover, obtained, what believe is for first time waveguide, 523 65 11%. end, also demonstrated operation single-transverse-mode reaching 28 maintaining high...
We report the realization of continuous wave laser emission in orange at 607 nm from a Pr:BaY(2)F(8) (Pr:BYF) crystal pumped by blue GaN diode. A maximal output power 78 mW is obtained quasi-single transverse mode beam. The effect reabsorption losses wavelength also evidenced.
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.
Stable passive Q-switching of a Tm: LiYF4 laser is obtained using polycrystalline Cr2+: ZnS as saturable absorber. The achieved maximum pulse energy 0.9 mJ and peak power 65 kW for duration ∼14 ns represent substantial improvement highest values passively Q-switched diode-pumped Tm operating at ∼1.9 μm.
Visible lasers are a fascinating regime, and their significance is illustrated by the 2014 Noble prizes in physics chemistry. With development of blue laser diodes (LDs), LD-pumped solid-state visible become burgeoning direction today. Constrained scarce optical modulators, ultrafast rarely realized. Based on bandgap structure optoelectronic properties atomic-layer MoS2, it can be proposed that MoS2 has potential as modulator. Here, originally revealing layer-dependent nonlinear absorption...
Tunable and mode-locked laser operation near 2 µm based on different Tm-doped YAG ceramics, 4 at.% 10 at.%, is demonstrated.Several designs of GaSb-based surface-quantum-well SESAMs are characterized studied as saturable absorbers for mode-locking.Best mode-locking performance was achieved using an antireflection-coated near-surface quantum-well SESAM, resulting in a pulse duration ~3 ps ~150 mW average output power at 89 MHz.All Tm:YAG ceramic lasers operated 2012 nm, with over 133 nm...
We report continuous-wave lasing demonstration of a Tm3+:KY3F10 crystalline gain medium at 2343 nm. A narrow-linewidth, tunable, Ti3+:sapphire laser was used to end pump crystal with thulium doping 8 at. %. With 1 W power, the resonator 1% output coupler generated powers 31 and 122 mW in single-pumping double-pumping configurations, respectively. Excitation efficiency investigated for wavelengths 765-806 nm range. Four bands were identified this wavelength range, two most efficient centered...
We report laser-induced cooling with thulium-doped BaY 2 F 8 single crystals grown using the Czochralski technique.The spectroscopic characterization of has been used to evaluate laser performance samples.Cooling by 3 degrees below ambient temperature is obtained in a single-pass geometry 4.4 Watts pump power at λ = 1855 nm.
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.
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.
Room-temperature continuous-wave laser action in a novel Tm-doped LiLuF4 crystal emitting at around 1.9 μm is demonstrated. The growth process, spectroscopic measurements, and performance are presented for different Tm concentrations. An overall tunability extending from 1817 to 2056 nm, slope efficiency of 46%, maximum output power excess 1.1 W reported.
Yb:CaYAlO(4) has been investigated spectroscopically and compared to better known Yb:CaGdAlO(4). It turns out that both materials show very similar spectroscopic parameters relevant ultrafast lasers design. Employing single-mode fiber-coupled 400-mW laser diode at 976 nm we measured pulses as short 43 fs, broad tunability of 40 with a simple single-prism setup.
In this Letter we report the realization of a femtosecond-laser-written diode-pumped Pr:LiLuF4 visible waveguide laser. The studied in work consisted depressed-index cladding, whose design and fabrication were optimized to minimize propagation loss. Laser emission has been achieved at 604 nm 721 nm, with output power 86 mW 60 mW, respectively, slope efficiencies 16% 14%. addition, obtained, for first time praseodymium-based laser, stable continuous-wave laser operation 698 (3 0.46%...
In this work, we present the operation of a femtosecond-laser-written diode-pumped visible waveguide laser based on praseodymium-doped lithium lutetium fluoride. The refractive index modification induced by femtosecond in crystal exhibits an anisotropic behavior, thus enabling fabrication different types waveguides from single-track structures to stress-induced and depressed cladding structures. All were characterized realizing transmission measurements design was optimized obtain extremely...