期刊文献+
共找到15篇文章
< 1 >
每页显示 20 50 100
Beam shaping in the high-energy kW-class laser system Bivoj at the HiLASE facility
1
作者 Tomáš Paliesek Petr Navrátil +3 位作者 Jan Pilar Martin Divoký Martin Smrž Tomáš Mocek 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2023年第6期130-138,共9页
A fully automatic fail-safe beam shaping system based on a liquid crystal on a silicon spatial light modulator has been implemented in the high-energy kilowatt-average-power nanosecond laser system Bivoj.The shaping s... A fully automatic fail-safe beam shaping system based on a liquid crystal on a silicon spatial light modulator has been implemented in the high-energy kilowatt-average-power nanosecond laser system Bivoj.The shaping system corrects for gain nonuniformity and wavefront aberrations of the front-end of the system.The beam intensity profile and the wavefront at the output of the front-end were successfully improved by shaping.The beam homogeneity defined by the beam quality parameters was improved two to three times.The root-mean-square value of the wavefront was improved more than 10 times.Consequently,the shaped beam from the second preamplifier led to improvement of the beam profile at the output of the first main cryo-amplifier.The shaping system is also capable of creating nonordinary beam shapes,imprinting cross-references into the beam,or masking certain parts of the beam. 展开更多
关键词 beam shaping high-average-power laser high-energy laser liquid crystal on silicon spatial light modulator wavefront shaping
原文传递
Collective coherent emission of electrons in strong laser fields and perspective for hard x-ray lasers
2
作者 E.G.Gelfer A.M.Fedotov +1 位作者 O.Klimo S.Weber 《Matter and Radiation at Extremes》 SCIE EI CSCD 2024年第2期1-3,共3页
Coherent motion of particles in a plasma can imprint itself on radiation.The recent advent of high-power lasers—allowing the nonlinear inverse Compton-scattering regime to be reached—has opened the possibility of lo... Coherent motion of particles in a plasma can imprint itself on radiation.The recent advent of high-power lasers—allowing the nonlinear inverse Compton-scattering regime to be reached—has opened the possibility of looking at collective effects in laser–plasma interactions.Under certain conditions,the collective interaction of many electrons with a laser pulse can generate coherent radiation in the hard x-ray regime.This perspective paper explains the limitations under which such a regime might be attained. 展开更多
关键词 laser SCATTERING COHERENT
下载PDF
Design of a kJ-class HiLASE laser as a driver for inertial fusion energy 被引量:2
3
作者 Antonio Lucianetti Magdalena Sawicka +6 位作者 Ondrej Slezak Martin Divoky Jan Pilar Venkatesan Jambunathan Stefano Bonora Roman Antipenkov Tomas Mocek 《High Power Laser Science and Engineering》 SCIE CAS 2014年第2期1-10,共10页
We present the results of performance modeling of a diode-pumped solid-state HiLASE laser designed for use in inertial fusion energy power plants. The main amplifier concept is based on a He-gas-cooled multi-slab arch... We present the results of performance modeling of a diode-pumped solid-state HiLASE laser designed for use in inertial fusion energy power plants. The main amplifier concept is based on a He-gas-cooled multi-slab architecture similar to that employed in Mercury laser system. Our modeling quantifies the reduction of thermally induced phase aberrations and average depolarization in Yb3+:YAG slabs by a combination of helium cryogenic cooling and properly designed(doping/width) cladding materials. 展开更多
关键词 ASE BIREFRINGENCE CRYOGENIC COOLING SLAB lasers thermooptic effects
原文传递
Comparative LIDT measurements of optical components for high-energy HiLASE lasers
4
作者 Jan Vanda Jan evcík +10 位作者 Egidijus Pupka Mindaugas ciuka Andrius Melninkaitis Martin Divoky Venkatesan Jambunathan Stefano Bonora Václav koda Antonio Lucianetti Danijela Rostohar Tomas Mocek Valdas Sirutkaitis 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2016年第1期75-83,共9页
Further advancement of high-energy pulsed lasers requires a parallel development of appropriate optical components.Several different optical components, such as mirrors and antireflection-coated windows, which are ess... Further advancement of high-energy pulsed lasers requires a parallel development of appropriate optical components.Several different optical components, such as mirrors and antireflection-coated windows, which are essential for the design of Hi LASE high average power lasers were tested. The following paper summarizes results on the measurements of laser-induced damage threshold of such components, and clearly shows their capabilities and limitations for such a demanding application. 展开更多
关键词 DIODE-PUMPED SOLID-STATE laser and applications LASER-INDUCED damage
原文传递
Overview of the HiLASE project: high average power pulsed DPSSL systems for research and industry
5
作者 M.Divoky M.Smrz +21 位作者 M.Chyla P.Sikocinski P.Severova O.Novak J.Huynh S.S.Nagisetty T.Miura J.Pila O.Slezak M.Sawicka V.Jambunathan J.Vanda A.Endo A.Lucianetti D.Rostohar P.D.Mason P.J.Phillips K.Ertel S.Banerjee C.Hernandez-Gomez J.L.Collier T.Mocek 《High Power Laser Science and Engineering》 SCIE CAS 2014年第2期1-10,共10页
An overview of the Czech national R&D project HiLASE(High average power pulsed laser) is presented. The project focuses on the development of advanced high repetition rate, diode pumped solid state laser(DPSSL) sy... An overview of the Czech national R&D project HiLASE(High average power pulsed laser) is presented. The project focuses on the development of advanced high repetition rate, diode pumped solid state laser(DPSSL) systems with energies in the range from mJ to 100 J and repetition rates in the range from 10 Hz to 100 kHz. Some applications of these lasers in research and hi-tech industry are also presented. 展开更多
关键词 DPSSL Yb3+:YAG thin-disk multi-slab PULSED high AVERAGE power laser
原文传递
Extendibility Evaluation of Industrial EUV Source Technologies for kW Average Power and 6.x nm Wavelength Operation
6
作者 Akira Endo 《Journal of Modern Physics》 2014年第5期285-295,共11页
Interests in the extendibility are growing after the introduction of the LPP (Laser Produced Plasma) EUV source technology in the semiconductor industry, towards higher average power and shorter wavelength, based on t... Interests in the extendibility are growing after the introduction of the LPP (Laser Produced Plasma) EUV source technology in the semiconductor industry, towards higher average power and shorter wavelength, based on the basic architecture of the established LPP EUV source technology. It is discussed in this article that the power scaling of the 13.5nm wavelength source is essentially possible by a slight increase of the driving laser power, CE (Conversion Efficiency) and EUV collection efficiency by some introduction of novel component technologies. Extension of the EUV wavelength towards BEUV (Beyond EUV), namely 6.x nm is discussed based on the general rule of the UTA (Unresolved Transition Arrays) of high Z ions, and development of multilayer mirrors in this particular wavelength region. Technical difficulties are evaluated for the extension of the LPP source technology by considering the narrower mirror bandwidth and higher melting temperature of the candidate plasma materials. Alternative approach based on the superconducting FEL is evaluated in comparison with the LPP source technology for the future solution. 展开更多
关键词 EUV LPP High Power BEUV FEL Super CONDUCTING ACCELERATOR
下载PDF
Kilowatt-class high-energy frequency conversion to 95 J at 10 Hz at 515 nm
7
作者 Martin Divoky Jonathan Phillips +11 位作者 Jan Pilar Martin Hanus Petr Navratil Ondrej Denk Tomas Paliesek Patricie Severova Danielle Clarke Martin Smrz Thomas Butcher Chris Edwards John Collier Tomas Mocek 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2023年第5期153-156,共4页
We report on frequency doubling of high-energy,high repetition rate ns pulses from a cryogenically gas cooled multi-slab ytterbium-doped yttrium aluminum garnet laser system,Bivoj/DiPOLE,using a type-I phase matched l... We report on frequency doubling of high-energy,high repetition rate ns pulses from a cryogenically gas cooled multi-slab ytterbium-doped yttrium aluminum garnet laser system,Bivoj/DiPOLE,using a type-I phase matched lithium triborate crystal.We achieved conversion to 515 nm with energy of 95 J at repetition rate of 10 Hz and conversion efficiency of 79%.High conversion efficiency was achieved due to successful depolarization compensation of the fundamental input beam. 展开更多
关键词 diode pumped solid state laser frequency conversion high energy high average power
原文传递
Design of deformable mirrors for high power lasers 被引量:2
8
作者 Stefano Bonora Jan Pilar +1 位作者 Antonio Lucianetti Tomas Mocek 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2016年第2期68-74,共7页
We present the workflow of the design, realization and testing of deformable mirrors suitable for high power diode pumped solid-state lasers. It starts with the study of the aberration to be corrected, and then it con... We present the workflow of the design, realization and testing of deformable mirrors suitable for high power diode pumped solid-state lasers. It starts with the study of the aberration to be corrected, and then it continues with the design of the actuators position and characteristic. In this paper, we present and compare three deformable mirrors realized for multi-J level laser facilities. We show that with the same design concept it is possible to realize deformable mirrors for other types of lasers. As an example, we report the realization of a deformable mirror for femtosecond lasers and for a CW CO_2 laser. 展开更多
关键词 ADAPTIVE OPTICS CLOSED LOOP deformable MIRROR high power LASERS
原文传递
Diode-pumped,electro-optically Q-switched,cryogenic Tm:YAG laser operating at 1.88 μm 被引量:2
9
作者 Jörg Körner Venkatesan Jambunathan +8 位作者 Fangxin Yue Jürgen Reiter Ondrej Slezák Petr Navrátil Samuel Paul David Antonio Lucianetti Joachim Hein TomášMocek Malte CKaluza 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2021年第1期103-108,共6页
We present a diode-pumped, electro-optically Q-switched Tm:YAG laser with a cryogenically cooled laser crystal at120 K. Output pulses of up to 2.55 mJ and 650 ns duration were demonstrated in an actively Q-switched co... We present a diode-pumped, electro-optically Q-switched Tm:YAG laser with a cryogenically cooled laser crystal at120 K. Output pulses of up to 2.55 mJ and 650 ns duration were demonstrated in an actively Q-switched configuration with a repetition rate of 1 Hz. By using cavity dumping the pulse duration was shortened to 18 ns with only a slightly lower output energy of 2.22 mJ. Furthermore, using a simplified rate equation model, we discuss design constraints on the pump fluence in a pulse pump approach for Tm:YAG to maximize the energy storage capability at a given pump power. 展开更多
关键词 cryogenic condition LASER Q-SWITCH short-wave infrared TM:YAG
原文传递
High-precision group-delay dispersion measurements of optical fibers via fingerprint-spectral wavelength-to-time mapping 被引量:1
10
作者 Takashi Ito Ondrej Slezak +2 位作者 Masahiro Yoshita Hidefumi Akiyama Yohei Kobayashi 《Photonics Research》 SCIE EI 2016年第1期13-16,共4页
The group-delay dispersion of an optical fiber was measured with the time-of-flight method, using fingerprint-like characteristic spectra from a mode-locked fiber laser source. To determine the group-delay dispersion ... The group-delay dispersion of an optical fiber was measured with the time-of-flight method, using fingerprint-like characteristic spectra from a mode-locked fiber laser source. To determine the group-delay dispersion up to the fourth order, least-squares fitting was applied to the overall time waveform mapped on the time axis for the fingerprint-spectral broadband pulses through a long optical fiber. The analysis of all 4003 data points reduced statistical uncertainty, and provided second-, third-, and fourth-order dispersion with uncertainties of 0.02%, 0.4%, and 4%,respectively. 展开更多
关键词 length time High-precision group-delay dispersion measurements of optical fibers via fingerprint-spectral wavelength-to-time mapping
原文传递
Periodic surface functional group density on graphene via laserinduced substrate patterning at Si/SiO2 interface 被引量:1
11
作者 Karolina A.Drogowska-Horna Inam Mirza +8 位作者 Alvaro Rodriguez Petr Kovaricek Juraj Sladek Thibault J.-Y.Derrien Mindaugas Gedvilas Gediminas Raciukaitis Otakar Frank Nadezhda M.Bulgakova Martin Kalbac 《Nano Research》 SCIE EI CAS CSCD 2020年第9期2332-2339,共8页
Controlling the spatial distribution of functional groups on two-dimensional(2D)materials on a micrometer scale and below represents a fascinating opportunity to achieve anisotropic(opto)electronic properties of these... Controlling the spatial distribution of functional groups on two-dimensional(2D)materials on a micrometer scale and below represents a fascinating opportunity to achieve anisotropic(opto)electronic properties of these materials.Periodic patterns of covalent functionalization can lead to pericxJic potentials in the monolayer;however,creating such superstructures is very challenging.Here,we describe an original approach to the periodic functionalization of graphene induced by substrate patterning using a pulsed laser.Laser-induced periodic surface structures(LIPSS)are produced on silicon wafers with thermally-grown oxide layers.The irradiation conditions for the formation of UPSS confined at the SiO2/Si interface have been unravelled.LIPSS imprint their periodicity to the reactivity of the monolayer graphene placed on the substrate via modulation of its local doping level.This method is clean,straightforward and scalable with high spatial resolution. 展开更多
关键词 two-dimensional(2D)materials graphene functionalization laser-induced periodic surface structures(LIPSS) periodic patterns Raman spectroscopy atomic force microscopy(AFM)
原文传递
Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser 被引量:1
12
作者 Sang-Hoon Nam Garima CNagar +3 位作者 Dennis Dempsey Ondrej Novák Bonggu Shim Kyung-Han Hong 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2021年第1期109-117,共9页
We present experimental and numerical investigations of high-energy mid-infrared filamentation with multi-octavespanning supercontinuum generation(SCG), pumped by a 2.4 μm, 250 fs Cr:ZnSe chirped-pulse laser amplifie... We present experimental and numerical investigations of high-energy mid-infrared filamentation with multi-octavespanning supercontinuum generation(SCG), pumped by a 2.4 μm, 250 fs Cr:ZnSe chirped-pulse laser amplifier.The SCG is demonstrated in both anomalous and normal dispersion regimes with YAG and polycrystalline ZnSe,respectively. The formation of stable and robust single filaments along with the visible-to-mid-infrared SCG is obtained with a pump energy of up to 100 μJ in a 6-mm-long YAG medium. To the best of the authors’ knowledge, this is the highest-energy multi-octave-spanning SCG from a laser filament in a solid. On the other hand, the SCG and evenharmonic generation based on random quasi-phase matching(RQPM) are simultaneously observed from the single filaments in a 6-mm-long polycrystalline ZnSe medium with a pump energy of up to 15 μJ. The numerical simulations based on unidirectional pulse propagation equation and RQPM show excellent agreement with the measured multioctave-spanning SCG and even-harmonic generation. They also reveal the temporal structure of mid-infrared filaments,such as soliton-like self-compression in YAG and pulse broadening in ZnSe. 展开更多
关键词 laser filamentation mid-infrared laser nonlinear optics ultrafast optics
原文传递
Overview of ytterbium based transparent ceramics for diode pumped high energy solid-state lasers
13
作者 Samuel Paul David Venkatesan Jambunathan +1 位作者 Antonio Lucianetti Tomas Mocek 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第4期109-118,共10页
Development of high energy laser sources with nanosecond pulses at several hertz values for repetition rate has been very attractive in recent years due to their great potential for practical applications. With the re... Development of high energy laser sources with nanosecond pulses at several hertz values for repetition rate has been very attractive in recent years due to their great potential for practical applications. With the recent advancement in fabricating large size laser quality transparent ceramics, diode pumped solid-state laser generating pulse energy of 100 J at 10 Hz has been recently realized at HiLASE center using Yb:YAG ceramic with Cr:YAG cladding. This review discusses Yb based high energy lasers, specific laser geometries for efficient thermal management and the role of transparent ceramics in such diode pumped high-energy-class solid-state lasers around the world. 展开更多
关键词 diode PUMPED SOLID-STATE LASERS high energy LASERS laser materials TRANSPARENT ceramics
原文传递
Recent advances in nanoparticle generation in liquids by lasers:Revealing formation mechanisms and tailoring properties
14
作者 Alexander V.Bulgakov Nadezhda M.Bulgakova 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2022年第7期115-117,共3页
When Fojtik and Henglein [1] submitted in 1992 the first scientific paper on generation of nanoparticles(NPs) by laser ablation in liquids, the authors probably could not realize how it will revolutionize the nanopart... When Fojtik and Henglein [1] submitted in 1992 the first scientific paper on generation of nanoparticles(NPs) by laser ablation in liquids, the authors probably could not realize how it will revolutionize the nanoparticle science and technology. In 2017, marking a quarter century of this pioneering study, Amendola and Barcikowski [2] pointed out that the simple and bright idea of Henglein and Fojtik was an inspiration to hundreds of scientists worldwide over 25 years and opened a way to use lasers in synthesis of colloids. 展开更多
关键词 liquids hundreds GENERATION
原文传递
Diurnal variation of aethalometer correction factors and optical absorption assessment of nucleation events using multi-wavelength photoacoustic spectroscopy
15
作者 Tibor Ajtai Gergely Kiss-Albert +4 位作者 Noemi Utry Adam Toth Andras Hoffer Gabor Szabo Zoltan Bozoki 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2019年第9期96-109,共14页
A field measurement campaign was carried out during the late winter and early spring of2015 in Budapest, the capital of Hungary. The size distribution(SD) and optical absorption of carbonaceous particulate matter(CPM)... A field measurement campaign was carried out during the late winter and early spring of2015 in Budapest, the capital of Hungary. The size distribution(SD) and optical absorption of carbonaceous particulate matter(CPM) was measured online using a Scanning Mobility Particle Sizer(SMPS), a 7λ-aethalometer and an inhouse developed 4λ-Photoacoustic Spectrometer. Based on the SD data, the measurement period could be classified into days with and without new particle formation events(normal days and nucleation days),although particular nucleation-like events were observed on normal days as well. Three characteristic size modes were observed with CMDs of circa 15, 25 and 110 nm that corresponded to the nucleation, traffic and heating modes. Based on the temporal behavior of these modes both types of days were divided into distinctive daily periods(heating hours,traffic hours and nucleation hours). The optical absorption spectra(OAC and AAE) also displayed the same part of day behavior to that of SD. That way this paper is among the first to assess the optical response of urban nucleation events. Due to the simultaneous measurement of OAC by the 7λ-aethalometer and a 4λ-Photoacoustic Spectrometer, OAC was measured overall at 11 wavelengths. That way aethalometer correction factors(f and C)were determined at all aethalometer wavelengths using in situ reference photoacoustic measurements. Correction factors were found to have both wavelength and time of the day variation. In the case of f, no clear trend could be observed, however, Cref values increased both as a function of wavelength. 展开更多
关键词 Photoacoustic spectroscopy Aerosol Angstr?m exponent AETHALOMETER NUCLEATION Size distribution
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部