C. Haefner
A5037322003- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Laser-induced spectroscopy and plasma
- Laser Material Processing Techniques
- High-pressure geophysics and materials
- Advanced Fiber Laser Technologies
- Advanced Optical Sensing Technologies
- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Optical Systems and Laser Technology
- Advanced Surface Polishing Techniques
- Quantum optics and atomic interactions
- Nuclear Physics and Applications
- Quantum Information and Cryptography
- Additive Manufacturing Materials and Processes
- Photonic and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- Optical Coatings and Gratings
- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- Nuclear physics research studies
- Additive Manufacturing and 3D Printing Technologies
- Cold Atom Physics and Bose-Einstein Condensates
Fraunhofer Institute for Laser Technology
2019-2025
RWTH Aachen University
2019-2024
Lawrence Livermore National Laboratory
2012-2024
Infrared Laboratories (United States)
2019
SLAC National Accelerator Laboratory
2019
Friedrich Schiller University Jena
2019
Czech Technical University in Prague
2019
Lawrence Berkeley National Laboratory
2017
University of Nevada, Reno
2004-2008
National Ignition Facility
2007
In the 2015 review paper ‘Petawatt Class Lasers Worldwide’ a comprehensive overview of current status high-power facilities ${>}200~\text{TW}$ was presented. This largely based on facility specifications, with some description their uses, for instance in fundamental ultra-high-intensity interactions, secondary source generation, and inertial confinement fusion (ICF). With 2018 Nobel Prize Physics being awarded to Professors Donna Strickland Gerard Mourou development technique chirped...
At the Helmholtz center GSI, PHELIX (Petawatt High Energy Laser for heavy Ion eXperiments) has been commissioned operation in stand-alone mode and, combination with ions accelerated up to an energy of 13 MeV/u by ion accelerator UNILAC. The heavy-ion beams available at GSI enables a large variety unique experiments. Novel research opportunities are spanning from study ion–matter interaction, through challenging new experiments atomic physics, nuclear and astrophysics, into field relativistic...
Abstract This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over last four years in unique collaboration 41 laboratories within Horizon 2020 study funded by Union. EuPRAXIA is first project that develops dedicated particle accelerator based on novel plasma acceleration concepts and laser technology. It focuses development electron accelerators underlying technologies, their user communities, exploitation existing...
A key challenge toward future quantum internet technology is connecting processors at metropolitan scale. Here, we report on heralded entanglement between two independently operated network nodes separated by 10 kilometers. The hosting diamond spin qubits are linked with a midpoint station via 25 kilometers of deployed optical fiber. We minimize the effects fiber photon loss frequency conversion qubit-native photons to telecom L-band and embedding link in an extensible phase-stabilized...
We are converting a quad of NIF beamlines into eight, short-pulse (1–50 ps), petawatt-class beams for advanced radiography and fast ignition experiments. This paper describes progress toward completing this project.
Large laser systems that deliver optical pulses with peak powers exceeding one Petawatt (PW) have been constructed at dozens of research facilities worldwide and fostered in High-Energy-Density (HED) Science, High-Field nonlinear physics [1]. Furthermore, the high intensities 10<sup>18</sup>W/cm<sup>2</sup> allow for efficiently driving secondary sources inherit some properties pulse, e.g. pulse duration, spatial and/or divergence characteristics. In intervening decades since first PW laser,...
New short-pulse kilojoule, Petawatt-class lasers, which have recently come online and are coupled to large-scale, many-beam long-pulse facilities, undoubtedly serve as very exciting tools capture transformational science opportunities in high energy density physics. These lasers also happen reside a unique laser regime: high-energy (kilojoule), relatively long (multi-picosecond) pulse-lengths, large (10s of micron) focal spots, where their use driving energetic particle beams is largely...
Precise assessment of the high fluence performance pulse compressor gratings is necessary to determine safe operational limits short-pulse energy lasers. We have measured picosecond laser damage behavior multilayer dielectric (MLD) diffraction used in compression chirped pulses on Advanced Radiographic Capability (ARC) kilojoule petawatt system at Lawrence Livermore National Laboratory (LLNL). present optical density measurements MLD using raster scan method order estimate performance. also...
The National Ignition Facility (NIF) at Lawrence Livermore Laboratory is the first of a kind megajoule-class laser with 192 beams capable delivering over 1.8 MJ and 500TW 351nm light [1], [2]. It has been commissioned operated since 2009 to support wide range missions including study inertial confinement fusion, high energy density physics, material science, laboratory astrophysics. In order advance our understanding, enable short-pulse multi-frame radiographic experiments dense cores cold...
Abstract By using additive manufacturing techniques like the laser powder bed fusion (LPBF) process, parts can be manufactured with high material efficiency because unfused reconditioned and reused in consecutive jobs. Nevertheless, process by-products spatters may influence quality hence alter mechanical properties/performance of parts. In order to investigate these dependencies, a methodology standard build job for recycling behavior lightweight aluminum alloy AlSi10Mg was developed built...
We present a highly efficient low-noise quantum frequency converter from the visible range to telecom wavelengths, combining pump laser at intermediate resonantly enhanced in an actively stabilized cavity with monocrystalline bulk crystal. A demonstrator for photons emitted by nitrogen-vacancy-center qubits achieves 43% external efficiency noise photon rate per wavelength (frequency) band of 2 s −1 /pm(17 /GHz) – reducing two orders magnitude compared current devices based on periodically...
Ti-6Al-4V is difficult to machine via milling or turning; therefore, near-net-shape manufacturing offers significant advantages as it can reduce the amount of material be subtracted down final dimension. Additive used accomplish near-net-shapes, but its low deposition rate makes less attractive for industry. In present study, we investigated how a rectangular laser spot with top hat intensity distribution increase powder-based direct energy deposition. Deposited single tracks, layers, and...
A noncollinear resonator with two beams circulating and intersecting in the focus allows resonator-assisted high-harmonic generation of high-power femtosecond pulses efficient geometrical output coupling. However, synchronization alignment is a challenge. We describe design employing wedge mirrors which avoids need for separate beams, providing intrinsic alignment. Transverse shifting fine tuning relative phase pulses, i.e., interference pattern focus. present resonators at MPQ Fraunhofer...
This paper reports on the status of PHELIX petawatt laser which is built at Gesellschaft fuer Schwerionenforschung (GSI) in close collaboration with Lawrence Livermore National Laboratory (LLNL), and Commissariat à l'Energie Atomique (CEA) France. First experiments carried out chirped pulse amplification (CPA) front-end will also be briefly reviewed.
Laser energy absorption and subsequent heat removal from diffraction gratings in chirped pulse compressors poses a significant challenge high repetition rate, peak power laser development. In order to understand the average limitations, we have modeled time-resolved thermo-mechanical properties of current advanced gratings. We also developed demonstrated technique actively cooling Petawatt scale, gold compressor operate at 600W - 15x increase over highest petawatt currently operation....
The HAPLS laser system has been commissioned to its first integrated performance milestone, delivering pulses with 16J sub-30fs duration at a 3⅓Hz repetition rate. This all-diode-pumped petawatt-class offers the average powers required for secondary source applications.
Overview of the laser systems being built for ELI-Beamlines is presented. The facility will make available high-brightness multi-TW ultrashort pulses at kHz repetition rate, PW 10 Hz rate pulses, and kilojoule nanosecond generation peak power. lasers extensively employ emerging technology diode-pumped solid-state (DPSSL) to pump OPCPA Ti:sapphire broadband amplifiers. These provide user community with cutting-edge resources programmatic research in applications high-intensity X-ray sources,...
Novel architectures of Petawatt-class, high peak power laser systems that allow operating at repetition rates are opening a new arena commercial applications secondary sources and discovery science. The natural path to higher average is the reduction total heat load induced generated in gain medium eliminating other inefficiencies with goal turn more energy into photons while maintaining good beam quality. However, architecture must be tailored specific application parameters such as...
We have developed low-dispersion (1480 l/mm), resonance-free, diffraction gratings made of dielectric materials resistant to femtosecond laser damage $(SiO_{2}/HfO_{2})$. A 14 cm diameter sample was fabricated resulting in a mean efficiency 99.1% at λ = 810 nm with 0.4% uniformity using equipment which can fabricate up 1m diagonal. The implementation these the compression 30 fs pulses an out-of-plane geometry result compressor efficiencies ~95%. measured absorption is 500x lower than current...
The advanced radiographic capability (ARC) laser system, part of the National Ignition Facility (NIF) at Lawrence Livermore Laboratory, is a short-pulse integrated into NIF. ARC designed to provide adjustable pulse lengths <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>∼</mml:mo> </mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mn>38</mml:mn> <mml:mspace width="thickmathspace"/> <mml:mi...
Dynamic wave-front correction is applied before each shot on a 100-TW, 30-J/300-fs high-power laser facility by use of an adaptive-optics system. This system allows us to increase the repetition rate high-energy lasers while maintaining excellent and constant beam focusability with Strehl ratio >0.75 despite amplifiers' not being in thermal equilibrium. The best results terms highest intensities are obtained when locking sensing after pulse recompression.
AbstractWe have developed preliminary conceptual laser system designs for the Laser ICF (Inertial Confinement Fusion) Fission Energy (LIFE) application. Our approach leverages experience in high-energy Nd: glass technology National Ignition Facility (NIF)1, along with high-energy-class diode-pumped solid-state (HEC-DPSSL) DOE's High Average Power (HAPL) Program and embodied LLNL's Mercury system.2We present suitable both indirect-drive, hot spot ignition fast targets. Main amplifiers systems...
Corrective optical elements form an important part of high-precision systems. We have developed a method to manufacture high-gradient corrective for high-power laser systems using deterministic magnetorheological finishing (MRF) imprinting technology. Several process factors need be considered polishing ultraprecise topographical structures onto surfaces MRF. They include proper selection MRF removal function and wheel sizes, detailed tool interferometry alignment, optimized schedules....
Overview of progress in construction and testing the laser systems ELI-Beamlines, accomplished since 2015, is presented. Good has been achieved all four lasers based largely on technology diode-pumped solid state (DPSSL). The first part L1 laser, designed to provide 200 mJ <15 fs pulses at 1 kHz repetition rate, up running. L2 a development line employing 10 J / Hz cryogenic gas-cooled pump which recently equipped with an advanced engine. Operation L3-HAPLS system, using DPSSL Ti:sapphire...