C. Haefner
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View article: Noncollinear enhancement resonator with intrinsic pulse synchronization and alignment employing wedge mirrors
Noncollinear enhancement resonator with intrinsic pulse synchronization and alignment employing wedge mirrors Open
A noncollinear resonator with two beams circulating and intersecting in the focus allows resonator-assisted high-harmonic generation of high-power femtosecond pulses with efficient geometrical output coupling. However, the synchronization …
View article: Laser additive manufacturing of TI-6AL-4V alloy at a high deposition-rate using a rectangular laser spot
Laser additive manufacturing of TI-6AL-4V alloy at a high deposition-rate using a rectangular laser spot Open
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 to be subtracted down to the final dimension. Additive manufacturing ca…
View article: AI-based spatially resolved parameter prediction in laser metal deposition for increased process stability
AI-based spatially resolved parameter prediction in laser metal deposition for increased process stability Open
In the additive manufacturing of components using powder-based laser metal deposition (LMD), the heating of the volume during buildup is a decisive factor for process stability and contour accuracy. If the process parameters remain constan…
View article: Metropolitan-scale heralded entanglement of solid-state qubits
Metropolitan-scale heralded entanglement of solid-state qubits Open
A key challenge toward future quantum internet technology is connecting quantum processors at metropolitan scale. Here, we report on heralded entanglement between two independently operated quantum network nodes separated by 10 kilometers.…
View article: Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters
Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters Open
We present a highly efficient low-noise quantum frequency converter from the visible range to telecom wavelengths, combining a pump laser at intermediate frequency resonantly enhanced in an actively stabilized cavity with a monocrystalline…
View article: Metropolitan-scale heralded entanglement of solid-state qubits
Metropolitan-scale heralded entanglement of solid-state qubits Open
A key challenge towards future quantum internet technology is connecting quantum processors at metropolitan scale. Here, we report on heralded entanglement between two independently operated quantum network nodes separated by 10km. The two…
View article: Multiphysics analysis of chip and resonator designs for increased damage threshold of external cavity high-power laser diodes
Multiphysics analysis of chip and resonator designs for increased damage threshold of external cavity high-power laser diodes Open
We present a detailed analysis of multiphysics simulation results to evaluate the threshold for catastrophic optical damage (COD) of high-power laser diodes under misaligned external optical feedback. Three different chip designs are inves…
View article: Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters
Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters Open
In this paper, we present a novel single stage quantum frequency conversion (QFC) scheme based on an enhancement cavity, which allows for high conversion efficiencies with record low noise levels, 100 times smaller than in previous systems…
View article: Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters
Low-noise short-wavelength pumped frequency down-conversion for Quantum Frequency Converters Open
In this paper, we present a novel single stage quantum frequency conversion (QFC) scheme based on an enhancement cavity, which allows for high conversion efficiencies with record low noise levels, 100 times smaller than in previous systems…
View article: Dynamic correction of optical aberrations for height-independent selective laser induced etching processing strategies
Dynamic correction of optical aberrations for height-independent selective laser induced etching processing strategies Open
Optical aberrations are a critical issue for tight focusing and high precision manufacturing with ultrashort pulsed laser radiation in transparent media. Controlling the wave front of ultrashort laser pulses enable the correction of low or…
View article: On the Influence of AlSi10Mg Powder Recycling Behavior in the LPBF Process and Consequences for Mechanical Properties
On the Influence of AlSi10Mg Powder Recycling Behavior in the LPBF Process and Consequences for Mechanical Properties Open
By using additive manufacturing techniques like the laser powder bed fusion (LPBF) process, parts can be manufactured with high material efficiency because unfused powder material can be reconditioned and reused in consecutive manufacturin…
View article: Demonstration of TNSA proton radiography on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser
Demonstration of TNSA proton radiography on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser Open
Proton radiography using short-pulse laser drivers is an important tool in high-energy density (HED) science for dynamically diagnosing key characteristics in plasma interactions. Here we detail the first demonstration of target-normal she…
View article: Accelerating the rate of discovery: toward high-repetition-rate HED science
Accelerating the rate of discovery: toward high-repetition-rate HED science Open
As high-intensity short-pulse lasers that can operate at high-repetition-rate (HRR) (>10 Hz) come online around the world, the high energy density (HED) science they enable will experience a radical paradigm shift. The >10 3 increase in sh…
View article: Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser
Spatio-temporal focal spot characterization and modeling of the NIF ARC kilojoule picosecond laser Open
The advanced radiographic capability (ARC) laser system, part of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, is a short-pulse laser capability integrated into the NIF. The ARC is designed to provide adju…
View article: Erratum: “First demonstration of ARC-accelerated proton beams at the National Ignition Facility” [Physics of Plasmas <b>26</b>, 043110 (2019)]
Erratum: “First demonstration of ARC-accelerated proton beams at the National Ignition Facility” [Physics of Plasmas <b>26</b>, 043110 (2019)] Open
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View article: Status of the Horizon 2020 EuPRAXIA conceptual design study*
Status of the Horizon 2020 EuPRAXIA conceptual design study* Open
The Horizon 2020 project EuPRAXIA (European Plasma Research Accelerator with eXcellence In Applications) is producing a conceptual design report for a highly compact and cost-effective European facility with multi-GeV electron beams accele…
View article: Entirely reflective slit spatial filter for high-energy laser systems
Entirely reflective slit spatial filter for high-energy laser systems Open
An entirely reflective slit spatial filter is proposed to provide spatial filtering, gain isolation, and ASE mitigation for high-energy laser systems. The traditional circular pinhole is replaced by two orthogonal slits, which lowers the i…
View article: Wavelength Scaling of Laser Wakefield Acceleration for the EuPRAXIA Design Point
Wavelength Scaling of Laser Wakefield Acceleration for the EuPRAXIA Design Point Open
Scaling the particle beam luminosity from laser wakefield accelerators to meet the needs of the physics community requires a significant, thousand-fold increase in the average power of the driving lasers. Multipulse extraction is a promisi…
View article: Temporal pre-pulse generation in high-intensity CPA lasers from imperfect domain orientation in anisotropic crystals
Temporal pre-pulse generation in high-intensity CPA lasers from imperfect domain orientation in anisotropic crystals Open
We present a study of the temporal pre-pulse contrast degradation of high focused intensity pulses produced in CPA laser systems due to imperfections in amplifier design, alignment of amplifier components, and crystal inhomogenity. Using a…
View article: Laser Technology Development for High Peak Power Lasers Achieving Kilowatt Average Power and Beyond
Laser Technology Development for High Peak Power Lasers Achieving Kilowatt Average Power and Beyond Open
Novel architectures of Petawatt-class, high peak power laser systems that allow operating at high repetition rates are opening a new arena of commercial applications of secondary sources and discovery science. The natural path to higher av…
View article: Low-dispersion low-loss dielectric gratings for efficient ultrafast laser pulse compression at high average powers
Low-dispersion low-loss dielectric gratings for efficient ultrafast laser pulse compression at high average powers Open
We have developed low-dispersion (1480 l/mm), resonance-free, diffraction\ngratings made of dielectric materials resistant to femtosecond laser damage\n$(SiO_{2}/HfO_{2})$. A 14 cm diameter sample was fabricated resulting in a mean\ndiffra…
View article: Petawatt and exawatt class lasers worldwide
Petawatt and exawatt class lasers worldwide Open
In the 2015 review paper ‘Petawatt Class Lasers Worldwide’ a comprehensive overview of the current status of high-power facilities of ${>}200~\text{TW}$ was presented. This was largely based on facility specifications, with some descriptio…
View article: First demonstration of ARC-accelerated proton beams at the National Ignition Facility
First demonstration of ARC-accelerated proton beams at the National Ignition Facility Open
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 to capture transformational science opportunities i…
View article: Scaling high-energy pulsed solid-state lasers to high average power
Scaling high-energy pulsed solid-state lasers to high average power Open
Techniques are provided for scaling the average power of high-energy solid-state lasers to high values of average output power while maintaining high efficiency. An exemplary technique combines a gas-cooled-slab amplifier architecture with…