A5016518150- Advanced Measurement and Metrology Techniques
- Surface Roughness and Optical Measurements
- Scientific Measurement and Uncertainty Evaluation
- Optical measurement and interference techniques
- Solid State Laser Technologies
- Advanced Fiber Optic Sensors
- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Atomic and Subatomic Physics Research
- Laser Design and Applications
- Photonic and Optical Devices
- Advanced Frequency and Time Standards
- Spectroscopy and Laser Applications
- Advanced MEMS and NEMS Technologies
- Optical Systems and Laser Technology
- Force Microscopy Techniques and Applications
- Advanced Surface Polishing Techniques
- Orbital Angular Momentum in Optics
- Microfluidic and Bio-sensing Technologies
- Calibration and Measurement Techniques
- Silicon and Solar Cell Technologies
- Electron and X-Ray Spectroscopy Techniques
- Mechanical and Optical Resonators
- Near-Field Optical Microscopy
- Image Processing Techniques and Applications
Czech Academy of Sciences, Institute of Scientific Instruments
2016-2025
Brno University of Technology
2020
Palacký University Olomouc
2010-2015
Czech Academy of Sciences
2013
The contribution reviews actual trends in the design of molecular iodine reference cells intended for laser standards operated space-related applications and which were recently developed at ISI CAS. need optical setup compactness robustness introduced multipass arrangements, leading to reduced system weight volume while maintaining long beam–absorber interaction lengths. resilience harsh environmental conditions, especially during mission launch, reliability whole lifetime led investigation...
Recently, increasing attention has been devoted to mastering a new technique of optical delivery micro-objects tractor-beam'1, 2, 3, 4, 5, 6, 7, 8, 9. Such beams have uniform intensity profiles along their propagation direction and can exert negative force that, in contrast the familiar pushing associated with radiation pressure, pulls scatterer toward light source. It was experimentally observed that under certain circumstances, pulling be significantly enhanced6 if non-spherical scatterer,...
Abstract One of the limiting factors for GNSS geolocation capabilities is clock technology deployed on satellites and knowledge satellite position. Consequently, there are numerous ongoing efforts to improve stability space-deployable clocks next-generation GNSS. The COMPASSO mission a German Aerospace Center (DLR) project demonstrate high-performance quantum optical technologies in space with two laser-based absolute frequency references, comb laser communication ranging terminal...
We present a design of nanometrology measuring setup which is part the national standard instrumentation for operated by Czech Metrology Institute (CMI) in Brno, Republic. The system employs full six-axis interferometric position measurement sample holder consisting six independent interferometers. Here we report on description alignment issues and accurate adjustment orthogonality axes. Consequently, suppression cosine errors reduction sensitivity to Abbe offset achieved through control all...
Abstract Laser interferometers have served as the workhorses in metrology of length for several decades. Their broader application brings further challenges, especially longer measurement time-frames or outside laboratory environment with strictly controlled conditions. As a part our team’s activities aiming at characterizing and eliminating effects unstable temperature on interferometric measurements, we report successfully remodelling differential interferometer’s optical arrangement...
Abstract Our research efforts in displacement measurement interferometry focused on long-term drifts initiated an extended experimental investigation the interferometric assemblies of our design. We aimed to analyze, characterize and tackle stability, expressed as zero-drift , with particular attention thermal effects. For experimentation, we developed a thermostatic chamber equipped active temperature regulation, array sensors control electronics. With either finely stabilized or cycling,...
The study compares three variants of focus sensors designed for the optical topography measurement rough surface specimens with submicron accuracy. We present a theoretical analysis sensor principles and experimental measurements single point laser probe. A low coherent illumination beam was provided by monochromatic source rotating diffuser, which reduced speckles generated surface. reflected modulated specific elements (axicon, double wedge prism, four spherical lenses) realized spatial...
Besides the environmental fluctuations, typical sources of significant uncertainty in laser interferometry systems are geometrical errors. These stemming, among others, from misalignment measurement axes, thermo-mechanical influences system components and mounting, guidance errors translation mechanism that carries mirror or vibrations. We report on a compact double-pass differential plane interferometer features an original optical arrangement with four parallel coplanar beams, where beam...
In scanning probe microscopy laser interferometers are usually used for measuring the position of tip with a metrological traceability. As most AFM setups designed to work under standard atmospheric conditions changes refractive index air have an influence measured values length 1.0exp(-4) relatively. order achieve better accuracies has be monitored continuously and its instantaneous value compensating lengths by all interferometric axes. presented we developed new concept electronic unit...
We present techniques oriented to improvement of precision in incremental interferometric measurements displacements over a limited displacement range. The wavelength the coherent laser source is here directly stabilized mechanical reference and not any optical frequency. This may represent reduction uncertainty linking indirectly evaluated refractive index but setup mechanics which cannot be completely eliminated. Here we suggest an approach where traditional interferometers are replaced by...
Abstract The purpose of this work is the study correlation between thickness tantalum pentoxide thin films and their three-dimensional (3D) micromorphology. samples were prepared on silicon substrates by electron beam evaporation. differences in surface structure processed reference investigated. Compositional studies performed energy-dispersive X-ray spectroscopy. Stereometric analysis was carried out basis atomic force microscopy (AFM) data, for with 20 nm, 40 60 80 nm 100 thicknesses....
In construction of highly mechanically stable measuring devices like AFM microscopes or nano-comparators the use low expansion materials is very necessary. We can find Zerodur ceramics ULE glasses used as a frame basement these devices. The coefficient such low-expansion lower than 0.01 x 10<sup>-6</sup> m•K<sup>-1</sup>. For example in case 20 cm long it leads to dilatation approximately 4 nm per 1 K. calculation total uncertainty mentioned knowledge thermal this work we present...
We present a combined interferometric arrangement designed for measurement of one-axis displacement over specified measuring range with mechanical referencing. This concept allows simultaneous the carriage position from both sides together monitoring overall range. can be used in configuration in-line fluctuations refractive index-–tracking refractometry. Similarly, wavelength laser source stabilized range, effectively compensating index changes. Otherwise, length give information about...
Abstract We report on investigations of how fast changes the refractive index influence uncertainty interferometric displacement measurements. Measurement position within a limited range is typical for precise positioning coordinate measuring systems, such as nanometrology standards combined with scanning probe microscopy (SPM). The varying air contributes significantly to overall uncertainty; it plays role especially in case longer-range systems. In our experiments we have observed that its...
Our research efforts in displacement measurement interferometry focused on long-term drifts initiated an extended experimental investigation the interferometric assemblies of our design. We aimed to analyze, characterize and tackle stability, expressed as zero-drift, with particular attention thermal effects. For experimentation, we developed a thermostatic chamber equipped active temperature regulation, array sensors control electronics. With either finely stabilized or cycling, can carry...
Within the DLR project COMPASSO, optical clock and link technologies will be evaluated in space on Bartolomeo platform attached to Columbus module of ISS. The system utilizes two iodine-based frequency references, a comb, an laser communication ranging terminal GNSS disciplined microwave reference. While COMPASSO is specifically dedicated test relevant for future satellite navigation (i.e. Galileo), are also crucial missions related Earth observation science. reference based modulation...
We investigate motion of particle pairs optically bound in tractor beam. The beam can exert a negative force on scatterer, contrast to the pushing associated with radiation pressure, which pull scatterer towards light source. movements be enhanced by long-range interaction between illuminated objects, called optical binding. study binding two micro-particles various geometrical configurations and their motional behaviour demonstrate that objects strongly depends mutual distance spatial...
We present a measuring technique for displacement and position sensing over limited range with detection of standingwave pattern inside passive Fabry-Perot cavity. The concept considers locking the laser optical frequency length cavity in resonance. Fixing to e.g. highly stable mechanical reference allows stabilize wavelength air thus eliminate especially faster fluctuations refractive index due flow inhomogeneities. Sensing interference maxima minima within along beam axis has been tested...
In this study a comparison of the topography BiFeO 3 (BFO) thin films deposited on tantalum pentoxide substrates different thicknesses is provided. The Ta 2 O 5 had roughness increasing with film thickness. relationship between but same composition quality growing bismuth ferrite estimated. For first time estimation BFO presented. difference in temperature expansion coefficients leads to intensive evaporation from surface during annealing. XPS analysis provided for asdeposited and annealed layers.
In this contribution we present a technology for deposition of interference coatings optical components designed to operate as active media in power pulsed lasers. The aim the is prepare crystals lasers HiPER project (High Power laser Energy Research) which should demonstrate feasibility driven fusion future energy source. Diode pumped solid state (DPSSL) are most likely option ignition. choice material medium critical. Some important properties include ability be antireflection coated...
In this contribution, we investigate the properties of antireflective coatings on iodine-filled absorption cell windows. These are subject to high temperatures during production process and in direct contact with medium, which influences their optical performance. We tested thermal resistance TiO2- Ta2O5- based produced using conventional electron beam evaporation (e-beam) ion-assisted deposition (PIAD). prepared a set cells that were used test coatings' iodine vapors. show choice coating...
We present a measuring technique for displacement and position sensing over limited range with detection of standingwave pattern inside passive Fabry-Perot cavity. The concept considers locking the laser optical frequency length cavity in resonance. Sensing interference maxima minima within along beam axis has been tested proven low loss photoresistive photodetector based on thin polycrystalline silicon layer.
We present an overview of approaches to the design nanometrology coordinates measuring setup with a focus on methodology interferometric techniques and associated problems. The development nanopositioning system multiaxis monitoring control involved for scanning probe microscopy (primarily atomic force microscopy, AFM) detection sample profile is presented. Coordinate position sensing allows upgrading imaging microscope up quantified measuring. Especially in micro- nanoworld overcoming...
In this contribution we present a technology for deposition and testing of interference coatings optical components designed to operate as in power pulsed lasers. We have are the process building apparatus which serves an addition our existing coating production facility. This allows us prepare can then tested results might be used optimize it. The test samples placed vacuum chamber, cooled down approximately 120K illuminated by laser determine damage threshold under conditions similar real...
In this contribution we present a technology for thin film optical coating deposition and laser induced damage threshold (LIDT) testing of coatings available at the Institute Scientific Instruments. We use our e-beam evaporation system equipped with plasma ion assisted to produce various LIDT test station them. The allows room temperature as well cryogenic conditions.