Antonio Agnesi
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View article: Few-cycle THz Pulse Generation in DSTMS Crystal Pumped by a 8.3-MHz Amplified Mamyshev Oscillator
Few-cycle THz Pulse Generation in DSTMS Crystal Pumped by a 8.3-MHz Amplified Mamyshev Oscillator Open
Mamyshev oscillators are an emerging class of ultrafast fiber lasers that support exceptionally broadband spectra and few-femtosecond pulse durations, making them well-suited for nonlinear frequency conversion. Despite this potential, THz …
Efficient energy extraction and improved pulse quality of a Mamyshev ultrafast fiber laser with a Fabry-Perot output coupler Open
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Simple derivation of tangential and sagittal focal lengths of a tilted spherical mirror Open
Mirror astigmatism is analysed with different approaches in the two orthogonal planes, in a way that is easier to follow and understand than the classic textbooks usually referred to in research papers.
High gain, multi-pass, femtosecond Yb: KYW crossed-crystals amplifier pumped by high-brightness tapered laser diodes Open
In this work we present the development and characterization of a high-gain, double-pass and four-pass femtosecond Yb: KYW amplifier pumped by two polarization-coupled tapered laser diodes emitting a total power of 9 W at 979 nm. The ampli…
Generation of CW mid-infrared radiation in the mW power range and tuneable over 400 nm Open
Miniaturization of mid-infrared (MIR) spectroscopy sources has progressed significantly during the past two decades, but a solution able to provide full integration, high optical power and wide tuneability in the so-called atmospheric wind…
View article: Femtosecond Mamyshev fiber oscillator started by ultra-low power microchip laser seeder at two different wavelengths: a comparison
Femtosecond Mamyshev fiber oscillator started by ultra-low power microchip laser seeder at two different wavelengths: a comparison Open
A 1-W average output power, sub-60-fs femtosecond Mamyshev fiber oscillator was reliably started by a passively Q-switched sub-ns microchip laser generating four-wave-mixing signals in a polarization-maintaining passive fiber, at either 10…
View article: Performance studies on group-velocity-matched femtosecond optical parametric generation
Performance studies on group-velocity-matched femtosecond optical parametric generation Open
We present a comparative study and detailed characterization of high-power femtosecond optical parametric generation (OPG) at 10 MHz repetition rate in the near and mid-infrared by exploiting near-zero group-velocity-mismatch (GVM) in the …
1 MW Peak‐Power Mamyshev Oscillator Started by a Passively Q‐Switched Microchip Laser Open
Ultrafast fiber lasers (UFLs) have become an attractive alternative to solid‐state lasers (SSL) due to their excellent beam quality, compactness, environmental stability, and easy thermal management. In the last decade, a significant resea…
Compact all-solid-state femtosecond Yb amplifier using a high-brightness multi-watt tapered laser diode Open
In this work, we present a novel amplification module based on a high-brilliance tapered pump laser diode. A monolithic distributed Bragg grating permits to stabilize the diode wavelength, that was kept at 978.5 nm with a full-width at hal…
Self-Mixing Displacement Measured by a Two-Color Laser in 66-nm Steps Open
We demonstrate a new self-mixing interferometer (SMI) simultaneously working on two wavelengths, the fundamental at 1064 nm and the second harmonic at 532 nm delivered in the same beam. The beam is sent to the remote target in the usual wa…
View article: The CaloCube calorimeter for high-energy cosmic-ray measurements in space: performance of a large-scale prototype
The CaloCube calorimeter for high-energy cosmic-ray measurements in space: performance of a large-scale prototype Open
The direct observation of high-energy cosmic rays, up to the PeV energy region, will increasingly rely on highly performing calorimeters, and the physics performance will be primarily determined by their geometrical acceptance and energy r…
View article: The CaloCube calorimeter for high-energy cosmic-ray measurements in space: Performance of a large-scale prototype
The CaloCube calorimeter for high-energy cosmic-ray measurements in space: Performance of a large-scale prototype Open
The direct observation of high-energy cosmic rays, up to the PeV energy region, will increasingly rely on highly performing calorimeters, and the physics performance will be primarily determined by their geometrical acceptance and energy r…
View article: Few-optical-cycle pulse generation based on a non-linear fiber compressor pumped by a low-energy Yb:CALGO ultrafast laser
Few-optical-cycle pulse generation based on a non-linear fiber compressor pumped by a low-energy Yb:CALGO ultrafast laser Open
Pulse compression in a short, normal dispersion photonic-crystal fiber is investigated with a Yb:CaGdAlO 4 laser pumped by a low-power fiber-coupled single-mode diode that delivers 70-fs pulses at 1050 nm central wavelength, with 45-mW ave…
Passively Q-switched single-frequency Nd:YVO<sub>4</sub> ring laser with external feedback Open
A compact diode-pumped Nd:YVO4 ring laser was developed for generation of relatively long (few tens nanoseconds) single-frequency pulses for high-spectral-resolution LIDAR applications. Exploiting the feedback from an external mirror and C…
View article: CaloCube: an innovative homogeneous calorimeter for the next-generation space experiments
CaloCube: an innovative homogeneous calorimeter for the next-generation space experiments Open
The direct measurement of the cosmic-ray spectrum, up to the knee region, is one of the instrumental challenges for next generation space experiments. The main issue for these measurements is a steeply falling spectrum with increasing ener…
SESAM mode-locked Yb:GdYCOB femtosecond laser Open
We report a detailed characterization of the diode-pumping operation of the mixed crystal Yb0.1:Gd0.5Y0.4COB, including cw, tunable and femtosecond laser regimes. This crystal was recently proposed as a promising candidate for high-power a…
Continuous-wave and SESAM mode-locked femtosecond operation of a Yb:MgWO_4 laser Open
We present a detailed continuous-wave regime characterization and, for the first time to the best of our knowledge, SESAM mode-locked femtosecond operation with a monoclinic, Yb3+-doped, MgWO4 crystal. Pumping with a low-power, single-mode…
View article: CaloCube: a novel calorimeter for high-energy cosmic rays in space
CaloCube: a novel calorimeter for high-energy cosmic rays in space Open
CaloCube is an R&D project borne to develop a novel calorimeter design, optimized for high-energy cosmic ray measurements in space. A small prototype made of CsI(Tl) elements has been built and tested on particle beams. A final version, ma…
Ultrafast, solid-state oscillators based on broadband, multisite Yb-doped crystals Open
A detailed performance comparison of new interesting Yb-doped crystals in the same oscillator setup, with single-mode fiber-coupled diode laser pump is reported. We intended to assess the shortest pulses achievable with available SESAM tec…
Design and Development of the Folded 4-Mirror Resonators for Diode End-pumped Solid-State Cr:LiSAF Laser Open
We present the design and development of folded four-mirror resonators for diode end-pumped solid-state Cr:LiSAF lasers. The astigmatic effects due to the Brewster-cut laser crystal and two curved mirrors used at oblique incidence were tak…