A5058443793- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Photorefractive and Nonlinear Optics
- Laser Material Processing Techniques
- Photonic Crystal and Fiber Optics
- Adhesion, Friction, and Surface Interactions
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Surface Roughness and Optical Measurements
- Electronic and Structural Properties of Oxides
- Advanced Surface Polishing Techniques
- Glass properties and applications
- TiO2 Photocatalysis and Solar Cells
- Atomic and Molecular Physics
- Terahertz technology and applications
- Surface Modification and Superhydrophobicity
- Magneto-Optical Properties and Applications
- Advanced Fiber Optic Sensors
- Semiconductor materials and devices
- Electrohydrodynamics and Fluid Dynamics
- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
Czech Academy of Sciences, Institute of Physics
2015-2024
InLaser
2023
Czech Technical University in Prague
2014-2021
An overview of the latest developments kilowatt-level diode pumped solid state lasers for advanced applications at HiLASE Centre is presented. subcontracted and in-house-developed laser beamlines The aim development to build kW-class delivering picosecond pulses between 1- 100-kHz repetition rates high-energy nanosecond 10 Hz. are based on Yb:YAG thin-disk amplifiers chirped pulse amplification. current status beamlines’ performance reported. advantages zero-phonon line pulsed pumping...
The development of kW-class diode-pumped picosecond laser sources emitting at various wavelengths started the HiLASE Center four years ago. A 500-W Perla C thin-disk with a diffraction limited beam and repetition rate 50–100 kHz, frequency conversion to mid-infrared (mid-IR), second fifth harmonic frequencies was demonstrated. We present an updated review on progress in compact femtosecond high average power radiation covering ultraviolet (UV) mid-IR spectral range Center. also report...
A unique combination of the ultrashort high-energy pulsed laser system with exceptional beam quality and a novel Diffractive Optical Element (DOE) enables simultaneous production 2601 spots organized in square-shaped 1 × mm matrix less than 0.01 ms. By adjusting processing parameters each spot can contain Laser Induced Periodic Surface Structures (LIPSS, ripples), including high-spatial frequency LIPSS (HFSL) low-spatial (LSFL). DOE placed before galvanometric scanner allows easy integration...
Laser treatment of amorphous TiO<sub>2</sub>nanotube layers leads to their crystallization without deformation or formation the thermal oxide layer.
Multi-beam micro- and nano-machining of material surfaces has been getting more important because its great potential to increase production speed large size laser induced periodic surface structures (LIPSS). Fast cheap engineered can bring unique properties like tailored wettability, friction, antibacterial properties, etc., mass-production with consequence in, for example, energy costs savings. However, tailoring long-term stable interference patterns from ultrashort pulses requires an...
We report new observations on picosecond deep ultraviolet coherent beams generated in a CLBO as the fourth and fifth harmonics of diode pumped high average power Yb:YAG thin disk laser operating at 77 kHz repetition rate 1030 nm. The effects two-photon absorption were observed, e.g. modification phase matching conditions, lowering conversion efficiency. harmonic generation (4ω+1ω) was studied for different time delays between both pump case excess input fundamental. latter effect suggests...
The Verdet constant dispersion of CeF3 crystal was measured in the spectral range from 0.45 to 1.95 μm. To best our knowledge, investigated for first time as a potential material candidate near-infrared Faraday rotators (FRs). experimental results obtained were compared other magneto-optical materials with conclusion that possesses up 60% higher region 1.1 1.5 μm widely used terbium gallium garnet crystal. Furthermore, presented setup is capable high precision measurement broad range, error...
We report on the characterization of a high-power, chirped volume Bragg grating (CVBG) pulse compressor. It includes measurements CVBG's diffraction efficiency, beam profile, quality (M2 parameter), spectrum, temperature, and thermal lens. These parameters were monitored for wide range input laser powers with different clamping forces applied CVBG. This analysis was performed CPA-based Yb:YAG thin-disk system operating at wavelength 1030 nm, 92 kHz repetition rate, 2 ps duration, an average...
We have experimentally demonstrated an actively mode-locked laser with a Tm3+-doped yttrium lithium fluoride crystal (YLF). A continuous regime was achieved using acousto-optic modulator and stable train of pulses 149.3 MHz repetition rate, 170 ps pulse width 2.6 W average output power at 1.91 µm in nearly diffraction-limited beam obtained. To the best our knowledge, this is first report on diode-pumped bulk thulium output.
High average power picosecond Yb:YAG thin-disk lasers are being developed at Hilase. A compact 1 mJ/100 kHz and 4 zero-phonon-line-pumped regenerative amplifiers PERLA C with a CVBG compressor provide <2 ps long pulses in nearly diffraction-limited beam. The output was successfully converted to 2nd 4th harmonic frequency high conversion efficiency. energy, QCW-pumped beamline B is operated 45mJ/1kHz fundamental spatial mode pulse length < 2ps. Its second stage amplifier assembled 1.8 J...
As-prepared nanostructured semiconductor materials are usually found in an amorphous form, which needs to be converted into a crystalline one for improving electronic properties and achieving enhanced application functionalities. The most utilized method is thermal annealing furnace, however time- energy-consuming not applicable low-temperature melting substrates. An alternative laser annealing, can carried out relatively short time and, additionally, offers the possibility of localized...
We report a high-brightness mid-IR diode-pumped laser based on 15 at.% Er:Y2O3 ceramics operated at room temperature. Up to 0.95 W of output power 2725 nm was obtained with 17.4% slope efficiency respect the absorbed pump and an M2 < 1.2. Furthermore, maximum peak 9 generated pulsed pumping. Perspectives for further scaling are also considered.
We are developing an Yb:YAG thin disk regenerative amplifier operating at 1 kHz repetition rate which should deliver output of 100 W average power corresponds to the pulse energy mJ. In order achieve such high energy, large size mode matching on a thin-disk is required avoid optical damage but other hand, larger area more susceptible influence phase distortions (OPD's) thus limits achievable and beam quality. developed compact setup allowing precise measurement deformations by implementation...
This work reports on a liquid-nitrogen-cooled, SESAM mode-locked Yb:YGAG (Yb:Y(3)Ga(2)Al(3)O(12)) ceramic laser. The has similar structure to Yb:YAG, but its emission spectrum at low temperature remains much broader, which is suitable for ultrashort pulse generation and amplification. A stable train with 119-MHz repetition rate was obtained wavelength of 1026 nm. measured duration 2.4 ps, more than four times shorter that achieved cryogenically-cooled Yb:YAG. Furthermore, laser performance...
Ultrashort-pulse, high average power thin-disk lasers matured and became efficient tools for precise material processing hi-tech laser applications.Hilase centre developed a diodepumped platform Yb:YAG regenerative amplifiers delivering pulse energy >40 mJ, repetition rate up to 400 kHz, nearly diffraction-limited output beam, reaching of >500 W. The called Perla is based on chirped-pulse amplification system (CPA) consisting fiber-based front-end, amplifier followed by compact...
In this paper, we present the stability characteristics of a supercontinuum (SC) generated in 60 mm, 100 and 130 mm long undoped yttrium aluminum garnet (YAG) crystal pumped by Yb thin-disk regenerative amplifier. The 1.2 ps pulses with central wavelength 1030 nm repetition rate 89 kHz are loosely focused (NA = 0.0031) into order to prevent laser-induced damage increase energy SC. Out tested lengths, optimal is experimentally determined be mm. contained blueshifted side, which has 530...
We report a high power Yb:YAG thin disk laser with cylindrical vector polarization incorporating an intracavity S-waveplate. By adjusting the angle of S-waveplate in resonator, we could select state output, radial or azimuthal polarization, resonator. The yielded ⪆10 W both polarized output for incident pump 131 continuous-wave mode operation, corresponding to slope efficiency ⪆18%. Output characteristics will be discussed detail.
In this paper, we present a single crystal, KTA (potassium titanyl-arsenate, KTiOAsO$_4$) based picosecond optical parametric amplifier pumped by an in-house built 1030 nm Yb:YAG thin-disk laser, capable of tunability from 1.46 to 3.5 $\mu$m, operating at 90 kHz, with high average power in the signal and idler beams. The highest output 8.9 W was reached for 1750 beam 19% conversion efficiency respective 2500 6.2 13% efficiency. combined mid-IR obtained 17 2060 wavelength degeneracy point.
Abstract In this paper, we present a single crystal, KTA (potassium titanyl-arsenate, KTiOAsO 4 ) based picosecond optical parametric amplifier pumped by an in-house built 1030 nm Yb:YAG thin-disk laser, capable of tunability from 1.46 to 3.5 µ m, operating at 90 kHz, with high average power in the signal and idler beams. The highest output 8.9 W was reached for 1750 beam 19% conversion efficiency respective 2500 6.2 13% efficiency. combined mid-infrared 17 2060 wavelength degeneracy point.