A5013114258- Laser Material Processing Techniques
- Cultural Heritage Materials Analysis
- Ocular and Laser Science Research
- Conservation Techniques and Studies
- Laser-induced spectroscopy and plasma
- Solid State Laser Technologies
- Laser Design and Applications
- Metal and Thin Film Mechanics
- Archaeological Research and Protection
- Diamond and Carbon-based Materials Research
- Tribology and Lubrication Engineering
- Advanced Measurement and Detection Methods
- Adhesion, Friction, and Surface Interactions
- Advanced Surface Polishing Techniques
- Analytical chemistry methods development
- Surface Treatment and Residual Stress
- Optical Systems and Laser Technology
- Advanced Fiber Laser Technologies
- Metallic Glasses and Amorphous Alloys
- Optical Coherence Tomography Applications
- Laser-Ablation Synthesis of Nanoparticles
- Ancient Mediterranean Archaeology and History
- Laser and Thermal Forming Techniques
- Ion-surface interactions and analysis
- Building materials and conservation
Military University of Technology in Warsaw
2007-2020
Maksymilian Pluta Institute of Applied Optics
2006-2015
Institute of Plasma Physics and Laser Microfusion
1991
Metal artworks are subjected to corrosion and oxidation processes due reactive agents present in the air, water ground that these objects have been contact with for hundreds of years. This is case archaeological metals recovered from excavation sites, as well artefacts exposed polluted air. Stabilization conservation state needs precise diagnostics accrued surface layers identification original, historical materials before further protective treatments, including safe laser cleaning unwanted...
Pulsed and continuous wave lasers, which are widely applied in diverse micromachining industrial processing, could be used the cleaning of historic objects. However, many issues concerning interaction between lasers historical metals not yet resolved application metal conservation is universally accepted. As a substantial part broader project, this paper presents preliminary evaluation critical process issues, including diagnostics corrosion layers, their ablation thresholds as well...
Preliminary results of the application optical coherence tomography (OCT), in particular its spectral mode (SOCT) to control a varnish ablation process, are presented. Examination craters made with an Er:YAG laser allows optimization emission parameters controlling fluence respect efficiency and safety process. Results measurements crater depth as function number pulses for given presented selected resins. This validates applicability SOCT calibration conditions laser-varnish-paint layer...
The paper presents results of direct micromachining and interference lithography using high power laser. technology allows one step (direct) manufacturing surface structures in micro- submicro-scale with well defined long-range arrangement. Construction the two-channel laser system creates arms Mach-Zehnder interferometer, which fast easy change pattern parameters as control energy density interfering beams.
Seeding of cells on functional, biocompatible scaffolds is a crucial step in achieving the desired engineered tissue. The authors show constructional solutions Nd:YAG pulse laser system with Q-switch modulation for direct and interferential shaping surface materials. two-channel interference distinguished by high control, simplicity repetitiveness regarding energy level dimensions structures. experiments were conducted hard, substrates amorphous carbon (diamond-like carbon, DLC)...
Since many medical diagnostic methods are non-invasive and even non-contact, they well suited for inspection of fragile unique objects art. In art conservation it is a need convenient method monitoring removal the varnish layer from paintings - one most crucial operations in their restoration. this study we present application Spectral Optical Coherence Tomography (SOCT) <i>in-situ </i>monitoring laser ablation layer. The examination craters made with Er:YAG permits optimization emission...
A dual-channel laser system consisting of an Nd:YAG generator with Q - modulation and a "p – branch" type unstable resonator has been presented in the article. The assembly configured such way to constitute arms Mach-Zehnder interferometer. regulation amplification coefficient both amplifying channels allows for quick easy changes output energy each channel up value approximately 1.5 J, pulse duration 8-10 ns. configuration interference allowed angle between interfering beams. Full...
The main problem connected with crystallization of amorphous magnetic materials from the FeSiB(X) group is increase their fragility increasing content crystalline phase. To overcome this defect possibilities offered by interference, pulse laser heating FeSiB ribbons were utilized. A simple, interference prismatic system at output Nd:YAG (8-10 ns, 2 J, 1064 nm) was used. investigations included influence radiation energy density, number pulses and periodical, spatial surface arrangement on...
Paper presents three developments of laser systems aimed at more safe and efficient cleaning paper parchment, paintings metal artworks. Short introduction scope our work are included in the first paragraph. In following sections presented details: - picosecond, diode pumped Nd:YAG system with computer controlled manipulation table proposed "online" diagnostic for paper, parchment paintings, ReNOVALasErb (2.94 μm) narrowed width output pulses generator-amplifier configuration temporal...
This letter describes modelling and experimental results of low high pressure shock waves (of the order 100 1000 bar, respectively) induced by pulse laser radiation. Measurements were performed using piezoelectric polymer PVDF sensors. The numerical calculations their comparison with an experiment have been posted. Measured calculated used in estimation temporary course signals from a fibre VISAR interferometer which measured movement velocity steel plate driven analysed waves. Description...
Detailed studies on the effects of pulsed laser interference heating surface characteristics and subsurface microstructure amorphous Fe80Si11B9 alloy are reported.Laser heating, with relatively low energy (90 120 mJ), but a variable number (from 50-500) consecutive pulses permitted to get accumulation in heated areas.Such treatment allowed form two-Dimensional micro-islands laser-affected material periodically distributed matrix.The crystallization process FeSiB ribbons was studied by means...
Laser drilling is a noncontact technology which allows high flexibility and full automation of the process. The research presented aimed at developing laser for manufacturing microsieves in thin Ni Al foils. Involute square distributions holes were formed with an overall dimension 3mm. Distance between adjacent was 25um to 100um, meant fabrication up 10,000 openings per microsieve. Owing optimisation optical system design micromachining parameters, desired diameter around 12um fabricated,...
Optical Coherence Tomography (OCT) is a new, fast-growing technique for non-contact and non-destructive imaging of semi-transparent objects. It has been recently used diverse applications in art conservation subject - among others it very well suited varnish layer thus monitoring removing process, including the laser ablation. In this study we show how to use OCT obtain information required optimisation emission parameters like fluency working regime, with respect efficiency safety ablation...
During the last decade, laser ablation process has been just utilized for removal of encrustation at works art and architectural historical objects. This technique utilizes substantial difference in radiation absorption coefficients substrate. In paper authors present next object cleaned with pulse - limestone epitaph stalls King Batory's Chapel Wawel Castle Cracow, Poland. Experimental results include measurements optimization fluency dependence on wavelength Nd:YAG harmonic generation as...
Laser radiation is used, among others, for surface treatment of various materials. At the Institute Optoelectronics, under direction late Professor Jan Marczak, a number works in field laser materials processing were performed. Among them special recognition deserves flagship work Marczak: implementation Poland cleaning method artworks. Another big project involved direct interference lithography. These two projects have already been widely discussed many national and international...
In the present paper, a description of developed and operated Er:YAG laser system delivering output pulses several microseconds in duration energy up to 10 mJ is presented. The system, being simple cost-effective solution above problem, composed master oscillator one-stage single-pass amplifier. principle its operation based on well controlled free-running generator just threshold. Emitted this way single or trains two five are then amplified
Properties of materials under conditions dynamic deformation significantly differ from those in static conditions. They depend on rate deformation, microstructure the material and temperature. The study processes occurring at very high speed is possible using absorption power, nanosecond laser pulses [1, 2]. Short pulse radiation carefully selected layer as well inertial layers allow obtaining a shock wave pressure up to few GPa [1]. dependence profile layer, measured polymer PVDF transducer...
Spectral investigations in the UV-VIS range of selected Al alloys and composites, used construction armament components as well drones, were performed using LIBS technique. Two Nd:YAG lasers applied: a short pulse 4 ns 60 mJ laser long 200/400 (up to 1000) us (~ 2/4 up 10 J) laser. In experiments with only atomic spectra observed while for pulses, also molecular transitions have been recorded. Electron temperatures created plasma found on base Boltzmann law. Temperatures are clearly higher...