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Overview of the hilase project: high average power pulsed DPSSL systems for research and industry

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High Power Laser Science and Engineering 2014年第2期2卷 1-10页

作者： M.Divoky M.Smrz 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 hilase Institute of Physics AS CR v.v.i. Na Slovance 2 182 21 Prague Czech Republic STFC Rutherford Appleton Laboratory Didcot OX11 0QX United Kingdom

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.

关键词： DPSSL Yb3+:YAG thin-disk multi-slab pulsed high average power laser

High-precision group-delay dispersion measurements of optical fibers via fingerprint-spectral wavelength-to-time mapping

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Photonics Research 2016年第1期4卷 13-16页

作者： Takashi Ito Ondrej Slezak Masahiro Yoshita Hidefumi Akiyama Yohei Kobayashi Institue for Solid State Physics University of Tokyo hilase Centre Institute of Physics ASCR

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.

关键词： length time High-precision group-delay dispersion measurements of optical fibers via fingerprint-spectral wavelength-to-time mapping

Design of a kJ-class hilase laser as a driver for inertial fusion energy

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High Power Laser Science and Engineering 2014年第2期2卷 1-10页

作者： Antonio Lucianetti Magdalena Sawicka Ondrej Slezak Martin Divoky Jan Pilar Venkatesan Jambunathan Stefano Bonora Roman Antipenkov Tomas Mocek hilase Project Institute of Physics AS CR Na Slovance 2 18221 Prague Czech Republic CNR-IFN Via Trasea 7 35131 Padova Italy ELI Beamlines Project Institute of Physics AS CR Na Slovance 2 18221 Prague Czech Republic

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.

关键词： ASE birefringence cryogenic cooling slab lasers thermooptic effects

Design of deformable mirrors for high power lasers

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High Power Laser Science and Engineering 2016年第2期4卷 68-74页

作者： Stefano Bonora Jan Pilar Antonio Lucianetti Tomas Mocek CNR-IFN hilase Centre Institute of Physics AS CR Department of Physical Electronics Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in Prague

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.

关键词： adaptive optics closed loop deformable mirror high power lasers

Beam shaping in the high-energy kW-class laser system Bivoj at the hilase facility

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High Power Laser Science and Engineering 2023年第6期11卷 130-138页

作者： Tomáš Paliesek Petr Navrátil Jan Pilar Martin Divoký Martin Smrž Tomáš Mocek hilase Centre Institute of Physics of the Czech Academy of SciencesDolni BrezanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic

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 *** shaping system corrects for gain nonuniformity and wavefront aberrations of the front-end of the *** beam intensity profile and the wavefront at the output of the front-end were successfully improved by *** beam homogeneity defined by the beam quality parameters was improved two to three *** root-mean-square value of the wavefront was improved more than 10 ***,the shaped beam from the second preamplifier led to improvement of the beam profile at the output of the first main *** shaping system is also capable of creating nonordinary beam shapes,imprinting cross-references into the beam,or masking certain parts of the beam.

关键词： beam shaping high-average-power laser high-energy laser liquid crystal on silicon spatial light modulator wavefront shaping

Overview of ytterbium based transparent ceramics for diode pumped high energy solid-state lasers

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High Power Laser Science and Engineering 2018年第4期6卷 109-118页

作者： Samuel Paul David Venkatesan Jambunathan Antonio Lucianetti Tomas Mocek hilase Centre Institute of Physics of the Czech Academy of SciencesZa Radnicí 8285

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.

关键词： diode pumped solid-state lasers high energy lasers laser materials transparent ceramics

Recent advances in nanoparticle generation in liquids by lasers:Revealing formation mechanisms and tailoring properties

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 115-117页

作者： Alexander V.Bulgakov Nadezhda M.Bulgakova hilase Centre Institute of Physics of the Czech Academy of SciencesDolni Brezany 25241Czech Republic S.S.Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences Novosibirsk 630090Russia

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.

关键词： liquids hundreds generation

Diurnal variation of aethalometer correction factors and optical absorption assessment of nucleation events using multi-wavelength photoacoustic spectroscopy

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Journal of Environmental Sciences 2019年第9期31卷 96-109页

作者： Tibor Ajtai Gergely Kiss-Albert Noemi Utry Adam Toth Andras Hoffer Gabor Szabo Zoltan Bozoki Department of Optics and Quantum Electronics University of Szeged H-6720 Szeged Hungary hilase development Production Service and Trading Limited Szekesfehervar H-8000 Hungary MTA-SZTE Research Group on Photoacoustic Spectroscopy H-6720 Szeged Hungary ELI-HU Non-Profit Ltd H-6720 Szeged Hungary Department of Earth and Environmental Sciences University of Pannonia P.O. Box 158 Veszprem H-8201 Hungary MTA-PE Air Chemistry Research Group P.O. Box 158 Veszprem H-8201 Hungary

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.

关键词： Photoacoustic spectroscopy Aerosol Angstr?m exponent Aethalometer Nucleation Size distribution

Kilowatt-class high-energy frequency conversion to 95 J at 10 Hz at 515 nm

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High Power Laser Science and Engineering 2023年第5期11卷 153-156页

作者： Martin Divoky Jonathan Phillips Jan Pilar Martin Hanus Petr Navratil Ondrej Denk Tomas Paliesek Patricie Severova Danielle Clarke Martin Smrz Thomas Butcher Chris Edwards John Collier Tomas Mocek hilase Centre Institute of Physics of the Czech Academy of SciencesDolni BrezanyCzech Republic Central Laser Facility STFC Rutherford Appleton LaboratoryDidcotUK

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 *** 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.

关键词： diode pumped solid state laser frequency conversion high energy high average power