A5101580645- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Photonic and Optical Devices
- Solid State Laser Technologies
- Gamma-ray bursts and supernovae
- Laser-Matter Interactions and Applications
- Advanced Photonic Communication Systems
- SAS software applications and methods
- Radiation Detection and Scintillator Technologies
- Astro and Planetary Science
- Optical Network Technologies
- Spectroscopy and Laser Applications
- Medical Imaging Techniques and Applications
- Isotope Analysis in Ecology
- Advanced Measurement and Metrology Techniques
- Atomic and Subatomic Physics Research
- Semiconductor Lasers and Optical Devices
- Advanced Frequency and Time Standards
- Geotechnical and construction materials studies
- Analytical Chemistry and Sensors
- Education, Psychology, and Social Research
- Geodetic Measurements and Engineering Structures
- Noise Effects and Management
- Ocular and Laser Science Research
Czech Academy of Sciences, Institute of Scientific Instruments
2014-2024
Brno University of Technology
2017-2022
Czech Technical University in Prague
2011-2020
We report a tunable, high-energy, single-pass optical parametric generator (OPG) based on the nonlinear material, cadmium silicon phosphide, CdSiP(2). The OPG is pumped by cavity-dumped, passively mode-locked, diode-pumped Nd:YAG oscillator, providing 25 µJ pulses in 20 ps at 5 Hz. pump energy further boosted flashlamp-pumped amplifier to 2.5 mJ. temperature tunable over 1263-1286 nm (23 nm) signal and 6153-6731 (578 idler. Using configuration, we have generated pulse as high 636 1283 nm,...
We present optical fiber sensors to measurement strain and vibration. The are based on Bragg gratings (FBG). prepared construction of with respect its implementation the outer surface concrete structures compensation potential temperature drifts. These projected look forward maximal elongation strength which can be applied sensor. Each sensor contains two fibers FBGs. One FBG is glued into in points fixation line mounting holes. This prestressed half range, than stretching pressing measured...
We present development of new methods and techniques the splicing shaping optical fibers. developed for standard Single Mode (SM) Multimode (MM) fibers with different diameters in wavelength range from 532 to 1550 nm. Together these we prepared other special like as Polarization-Maintaining (PM) or hollow core Photonic Crystal Fiber (PCF) theirs cross focus minimalize backreflection attenuation. The especially PCF telecommunication SM can be done by light adjustment our techniques....
The contribution reports on the current state of fibre link for phase-coherent transfer optical frequency between ISI CAS (Brno, CZ) and CESNET (Prague, CZ). 306 km long is operated an internet communication in a dedicated 1540–1546 nm DWDM window. narrow linewidth laser Kohereas ADJUSTIK working at 1540.5 locked to nearest tooth stabilized comb referenced by H-Maser serves as standard transmitting side.
In nuclear power plants, particle accelerators, and other facilities, measuring the level of ionising gamma radiation is critical for safety management operation environment’s protection. However, in many cases, it impossible to monitor directly at required location continuously. This typically either due lack space accommodate entire dosimeter or environments with high activity, electromagnetic radiation, temperature, which significantly shorten electronics’ lifetime. To allow measurement...
We report on a traceable calibration system for 3500mm-long console that carries measurement inspecting the diameter of circular reactor chassis. The uses two single-pass laser interferometers with homodyne fringe detection in degrees freedom. hybrid FPGA-microcontroller control module out together application-specific scale linearization approach and compensation environmental influences such as thermal elongation refractive index air fluctuations. demonstrated feasibility an accuracy few...
Holmium-doped fibers with a low laser threshold and slope efficiency exceeding 80% prepared by nanoparticle-doping method are demonstrated. We proved the key factor for efficient holmium lasers is ratio of Al/Ho greater than 60.
We present system of structure health measurement by optical fiber sensors based on Bragg gratings. Our is focused to additionally install existing buildings. prepared first set-up the monitoring nuclear power plant containment shape deformation. The presented can measure up several tens simultaneously. Each sensor contains grating change length and other independed monitor temperature ineligible effects.
The common approach for a picosecond laser source with output energy in millijoule level is continuously pumped mode locked oscillator single pulse selector followed by regenerative amplifier. Systems can operate repetition rates up to 100 kHz duration around 10 ps. For many applications, as example ranging, lasers operating at below 1 longer durations are more suitable. Such pulses be obtained from passively mode-locked pulsed pumping, where the microjoule generated directly oscillators and...
Passively-mode-locked operation of Nd, Y:SrF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser pumped by low-power-laser-diode at 796 nm is reported. The continuous pulse train with total output power 100 mW and duration 1.5 ps 136 MHz was generated.
In this paper, we study the effect of decreasing aperture diameter on signal transmission from scintillator to PMT. The apertures have been inserted directly between and photomultiplier. Three different diameters used over a wide energy range. A newly developed fast digital spectrometer has utilized for experimental measurement in radial channel VR-1 research reactor. detector signals with without measured evaluated. aim our was determine spectral quality, range evaluated physical quantities.
We present system of structure health measurement by optical fiber sensors based on Bragg gratings. Our is focused to additionally install existing buildings. prepared first set-up the monitoring nuclear power plant containment shape deformation. The presented can measure up several tens simultaneously. Each sensor contains grating change length and other independed monitor temperature ineligible effects.
Femtosecond operation of passively mode-locked Nd, La:CaF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and La:SrF lasers pumped by low power laser diodes at 790 nm was investigated. The continuous trains pulses with pulse duration 783 fs 1065 747 1060nm were obtained in resonators without GVD compensation both cases for absorbed pump lower than 1W.
We present the development of new methods and techniques splicing forming optical fibers with focusing on ionizing radiation sensors. Optical fiber-based sensors can be prepared by combination scintillation material fibers. The type depends structure. to sensor preparation which used primary efficiency conversion. standard types different core diameters for powdered or crystalline structure material. On other side, liquid in microstructure fiber mainly. closing special hollow-core Photonic...
Passively mode-locked Nd:YVO4 laser in the double-bounce grazing-incidence geometry under pulsed diode-pumping is presented. Q-switched pulse-trains of 16 ps pulses at 1.06um were generated repetition rate 50Hz with low timing jitter 140ns.
In this paper we have investigated Bragg fibers for the 1.94 μm laser- radiation delivery generated by a thulium fiber laser with maximal continuous output power 50W. For such investigation laboratory-designed and fabricated hollow-core been employed different diameters of 5, 40, 56 73 surrounded three pairs circular layers. Fundamental optical characteristics as overall transmittance, attenuation coefficient, bending losses, delivered spatial beam profiles at wavelength all tested are...