A5051597843- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Anomaly Detection Techniques and Applications
- Building Energy and Comfort Optimization
- Gold and Silver Nanoparticles Synthesis and Applications
- Laser Material Processing Techniques
- Laser Design and Applications
- Plasmonic and Surface Plasmon Research
- Near-Field Optical Microscopy
- Diamond and Carbon-based Materials Research
- Advanced Surface Polishing Techniques
- Advanced X-ray Imaging Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Laser-induced spectroscopy and plasma
- Infrastructure Maintenance and Monitoring
- Photonic Crystal and Fiber Optics
- Industrial Vision Systems and Defect Detection
- Particle Accelerators and Free-Electron Lasers
- Digital Holography and Microscopy
Umeå University
2020-2024
In the past 20 years, we have reached a broad understanding of many light-driven phenomena in nanoscale systems. The temporal dynamics excited states are instead quite challenging to explore, and, at same time, crucial study for origin fundamental physical and chemical processes. this review, examine current state prospects ultrafast driven by plasmons both from applied point view. This research area is referred as plasmonics represents an outstanding playground tailor control fast optical...
Abstract We use a vortex retarder-based approach to generate few optical cycles light pulses carrying orbital angular momentum (OAM) (known also as twisted or vortex) from Yb:KGW oscillator pumping noncollinear parametric amplifier generating sub-10 fs linearly polarized in the near infrared spectral range (central wavelength 850 nm). characterize such vortices both spatially and temporally by using astigmatic imaging technique second harmonic generation-based frequency resolved gating,...
Optical parametric amplification (OPA) is a powerful tool for the generation of ultrashort light pulses. However, under certain circumstances, it develops spatio-spectral couplings, color dependent aberrations that degrade pulse properties. In this work, we present coupling generated by non-collimated pump beam and resulting in change direction amplified signal with respect to input seed. We experimentally characterize effect, introduce theoretical model explain as well reproduce through...
We present a label-free method for detecting anomalies during thermographic inspection of building envelopes. It is based on the AI-driven prediction thermal distributions from color images. Effectively performs as one-class classifier image regions with high mismatch between predicted and actual distributions. The algorithm can learn to identify certain features normal or anomalous by selecting target sample used training. demonstrated this principle training data collected at different...
We use a vortex retarder approach to generate few optical cycles light pulses carrying orbital angular momentum and arbitrary polarization. The vortices’ structure is then reconstructed in the spatio-temporal domain.
The Fourier-transform limit achieved by a linear spectral phase is the typical optimum generation of ultrashort light pulses. It provides highest possible intensity, however, not shortest full width at half maximum pulse duration, which relevant for many experiments. approach achieving shorter pulses than original Fourier termed temporal superresolution. We demonstrate this shaping from an optical parametric chirped amplifier and generate sub-Fourier limited also realize it in simpler way...
We report on details of a peak-power upgrade sub-5-fs Optical Parametric Synthesizer towards 100 TW. System design, pump pulse delaying and relay imaging system are presented. A tailored second third harmonic generation reaches conversion efficiencies 80% 60% with 80ps pulses.
Vacuum laser acceleration (VLA) of electrons has been an intense field research for a long time due to the extremely high (>1 TV/m) accelerating fields. However, it is very challenging realize and only few promising experiments have performed which demonstrated principle. Here, we report on interaction relativistic intensity (10<sup>20</sup> Wcm<sup>-2</sup>) sub-two optical cycle (<5 fs) pulses with nanotips optimize VLA. Various properties accelerated (angular distribution, charge,...
Vacuum laser acceleration (VLA) is a paradigm that utilizes the strong fields of focused light to accelerate electrons in vacuum. Despite its conceptual simplicity and large existing collection theoretical studies, realizing VLA practice has proven remarkably challenging due difficulties associated with efficient injection: be accelerated must pre-energized temporally compressed below an optical half-cycle before timely entering rapidly oscillating laser. Therefore, only handful experiments...
Acceleration of electrons in vacuum directly by intense laser fields, often termed acceleration (VLA), holds great promise for the creation compact sources high-charge, ultrashort, relativistic electron bunches. However, while energy gain is expected to be higher with tighter focusing (i.e. stronger electric field), this does not account reduced range, which limited diffraction. Here, we present results an experimental investigation VLA, using tungsten nanotips driven relativistic-intensity...
We use a vortex retarder-based approach to generate few optical cycles light pulses carrying orbital angular momentum (known also as twisted or vortex) from Yb:KGW oscillator pumping noncollinear parametric amplifier generating sub-10 fs linearly polarized in the near infrared spectral range (central wavelength 850 nm). characterize such vortices both spatially and temporally by using astigmatic imaging technique second harmonic generation-based frequency resolved gating, respectively. The...
For many applications of extreme ultraviolet (XUV) and X-ray pulses, a small focus size is crucial to reach the required intensity or spatial resolution. In this article, we present simple way characterize an XUV with resolution 1.85 µm. Furthermore, technique was applied for measurement optimization ellipsoidal mirror photon energies ranging from 18 150 eV generated by high-order harmonics. We envisage broad range approach sub-micrometer high-harmonic sources via synchrotrons free-electron lasers.
Optimization and simulation of non-collinear ultra-broadband optical parametric chirped pulse amplification setups rely on exact knowledge the phase matching conditions. We present a method for their accurate retrieval by deterministic angular jitter Monte-Carlo simulations.
The spectral phase and amplitude of a multi-TW laser with Fourier transform limit 4.6 fs was optimized to obtain 3.9 pulses >5TW, providing the most energetic sub-4-fs in world.
We report on the detection of spatio-temporal couplings in a 700-1000 nm NOPA using an optimized characterization method. The technique is performed during normal focus observation and requires little additional hardware.
In the past twenty years, we have reached a broad understanding of many light-driven phenomena in nanoscale systems. The temporal dynamics excited states are instead quite challenging to explore, and, at same time, crucial study for origin fundamental physical and chemical processes. this review examine current state prospects ultrafast driven by plasmons both from applied point view. This research area is referred as plasmonics represents an outstanding playground tailor control fast...