A5045267684- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Laser Material Processing Techniques
- Spectroscopy and Laser Applications
- Mass Spectrometry Techniques and Applications
- Laser Design and Applications
- Terahertz technology and applications
- Advanced X-ray Imaging Techniques
- Photonic Crystal and Fiber Optics
- Solid State Laser Technologies
- Orbital Angular Momentum in Optics
- Surface Chemistry and Catalysis
- Advanced optical system design
- Photonic and Optical Devices
- Adaptive optics and wavefront sensing
- Microfluidic and Capillary Electrophoresis Applications
- Electrowetting and Microfluidic Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-induced spectroscopy and plasma
- Quantum optics and atomic interactions
- Innovative Microfluidic and Catalytic Techniques Innovation
- Microbial Inactivation Methods
Center for Biomolecular Nanotechnologies
2020-2024
National Research Council
2020-2024
Istituto di Fotonica e Nanotecnologie
2016-2024
Politecnico di Milano
2014-2018
Mylan (Switzerland)
2017
Abstract Escaping from a complex maze, by exploring different paths with several decision-making branches in order to reach the exit, has always been very challenging and fascinating task. Wave field quantum objects may explore structure parallel interference effects, but without necessarily leading more efficient transport. Here, inspired recent observations biological energy transport phenomena, we demonstrate how walker can efficiently output of maze partially suppressing presence...
We investigated the giant resonance in xenon by high-order harmonic generation spectroscopy driven a two-color field. The addition of nonperturbative second component parallel to driving field breaks symmetry between neighboring subcycles resulting appearance spectral caustics at two distinct cutoff energies. By controlling phase delay color components it is possible tailor emission order amplify and isolate feature interest. In this Letter we demonstrate how control scheme can be used...
Over the last few decades, investigation of ultrafast phenomena occurring in atoms, molecules and solid-state systems under a strong-field regime light-matter interaction has attracted great attention. The increasing request for suitable optical technology is significantly boosting development powerful laser sources. In this framework, Optical Parametric Amplification (OPA) currently becoming leading solution applications high-power ultra-broadband light burst generation. main advantage...
Chiral molecules are widespread in nature, playing a fundamental role bio-chemical processes and the origin of life itself. The observation dynamics chiral is crucial for understanding control activity photo-excited states. One most promising techniques study systems time-resolved photoelectron circular dichroism (TR-PECD), which offers an intense sensitive probe vibronic geometric molecular structure as well electronic structures, their evolution on femtosecond timescale. However, non-local...
Abstract We report on the efficient generation of high-order harmonics in helium gas inside complex glass micro-devices fabricated by femtosecond laser micromachining. By exploiting three-dimensional capabilities and extreme flexibility this fabrication technique we developed fluidic micro-structures a fused-silica substrate that allowed us to achieve accurate control density micrometer-sized microchannel. As result, achieved broadband spectrum ultraviolet (XUV) radiation which extends up...
The development of compact and bright XUV soft X-ray sources based on high-order harmonic generation is boosting advances towards understanding the behavior matter with extreme temporal spatial resolutions. Here, we report efficient inside microfluidic devices fabricated by femtosecond laser irradiation followed chemical etching. Our approach allows one to control manipulate conditions in gas a micro-meter scale unprecedented flexibility, thus enabling high photon-flux broadband harmonics...
Abstract We present a robust, three-stage optical parametric amplifier driven by Ti:Sapphire ultrafast laser system that implements passive carrier-envelope phase stabilization and directly generates five-cycle mid-IR pulses dispersion compensation. The source is based on potassium titanyl arsenate crystals exploits intra-pulse difference-frequency seed generation in the mid-IR. This will be particularly suited for applications strong-field physics, such as high order harmonic photoelectron...
Spectral focusing of the recolliding electron in high-order harmonic generation driven by two-color fields is shown to be a powerful tool for isolating and enhancing hidden spectral features target under study. In previous works we used this technique probing multi-electron effects xenon compared our experimental results with time-dependent configuration-interaction singles calculations. We demonstrate here that can exploited reconstructing enhancement factor giant dipole resonance discuss...
We report on the application of femtosecond laser micromachining to fabrication complex glass microdevices, for high-order harmonic generation in gas. The three-dimensional capabilities and extreme flexibility allow us achieve accurate control gas density inside micrometer interaction channel. This device gives a considerable increase harmonics’ efficiency if compared with traditional jets. propose different chip geometries that driving field intensity channel quasi phase-matching conditions...
High order harmonic generation (HHG) has shown its impact on several applications in Attosecond Science and Atomic Molecular Physics.Owing to the complexity of experimental setup for characterization harmonics, as well large computational costs numerical modelling, HHG is generally performed modelled collinear geometry.Recently, experiments have been exploiting non-collinear geometry, such a grating excited molecules created by crossing beams.In studies, harmonics were observed at...
We numerically investigate generation of harmonics in the water window region (down to 2.8 nm) by 2 μm femtosecond pulses propagating hollow core waveguides filled with high pressure He. Numerical calculations are based on a three dimensional macroscopic model, which solves pulse propagation split-step method, uses strong field approximation evaluate single atom response, and integrates it coherently obtain harmonic field. Two configurations for considered: standard one constant diameter 70...
The four wave mixing (FWM) process is widely exploited for the generation of tunable ultrashort light pulses. Usually this driven in bulk materials, which are however prone to optical damage at high pump laser intensities. A source 10 μJ level pulses visible spectral region described here. In particular, we report on implementation FWM by a two-color ultrafast pulse inside gas-filled hollow core fiber (HCF). Due high-damage threshold and long interaction distance, HCF-based configuration...
We demonstrate the experimental realization of impulsive alignment carbonyl sulfide (OCS) molecules at Low Density Matter Beamline (LDM) free-electron laser FERMI. OCS in a molecular beam were impulsively aligned using 200 fs pulses from near-infrared laser. The was probed through time-delayed ionization above sulphur 2p edge, resulting multiple via Auger decay and subsequent Coulomb explosion molecules. ionic fragments collected time-of-flight mass spectrometer analysis ion-ion covariance...
Abstract Femtosecond laser micromachining is a versatile technique that broadly used for the fabrication of integrated optics and microfluidic devices. In this work, we present demonstration device high‐order harmonic generation in hollow waveguide filled with helium. We found higher yield spectrum reshaping (at gas baking pressures over 400 mbar) smoother surface. believe that, thanks to high versatility three‐dimensional capability microstructuring technique, next future it will be...
Abstract The use of fast closed-loop adaptive optics has improved the performance optical systems since its first application. Here we demonstrate amplitude and carrier-envelope phase stabilization a high energy IR parametric amplifier devoted to Attosecond Science exploiting two speed for correction static dynamic instabilities. exploitation multi actuator lenses allowed minimal impact on setup.
One way to increase the well known low efficiency of high order harmonics generation is place gas medium in a hollow core waveguide. The numerical model used obtain driving and field configuration along across waveguide was developed for an arbitrary density profile fiber diameter modulation. tested against experimental measurements excellent agreement obtained fluorescence emission We analyse influence modulation which result from fabrication process on both pulse propagation harmonic generation.
Femtosecond Laser Irradiation followed by Chemical Etching is exploited to create microfluidic devices for High-order Harmonic Generation (HHG) in noble gases. A finetuning of the channels' diameter and length permits production high-order harmonics completely different regimes, going from hollow waveguiding regime sub-mm interaction regime. We envisage that high adaptability our approach will allow us integrate more functionalities same integrated device thus paving way palm-top HHG solutions.
Structured light has gained significant attention in recent years, especially the generation and application of vector beams. These beams, characterized by a spatially varying polarization state, are powerful tool to enhance our capacity control light-matter interactions. In this study, we demonstrate synthesis extreme-ultraviolet (EUV) beams chip through high-order harmonic (HHG). Our findings showcase chip's ability transfer laser state into EUV beam despite extended interaction length....
we demonstrated the generation of extreme-ultraviolet light via high-order harmonics in a microfluidic device by means radially or azimuthally polarized laser beams.
Chiral molecules are widespread in nature, playing a fundamental role bio-chemical processes and the origin of life itself. The observation dynamics chiral is crucial for understanding control activity photo-excited states. One most promising techniques study systems time-resolved photoelectron circular dichroism (TR-PECD), which offers an intense sensitive probe vibronic geometric molecular structure as well electronic structures, their evolution on femtosecond timescale. However, non-local...
The development of compact and bright XUV soft X-ray sources based on high-order harmonic generation is boosting advances towards understanding the behavior matter with extreme temporal spatial resolutions. Here, we report efficient inside microfluidic devices fabricated by femtosecond laser irradiation followed chemical etching. Our approach allows one to control manipulate conditions in gas a micro-meter scale unprecedented flexibility, thus enabling high photon-flux broadband harmonics...
We explore via numerical modeling the generation of very short photon wavelengths in hollow core waveguides (HCW) filled with He gas at high pressures. Propagation femtosecond driving pulses is first solved using a split-step method and tested against other methods. The propagation along HCW reveals mode beating seen quasi-periodic oscillations field intensity phase which turn will determine single atom response to field. both cylindrical conical guide diameter varies direction. This second...