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Long-lived hot and dense plasma from relativistic laser-nanowire array interaction 认领 引用
1
作者 Ehsan Eftekhari-Zadeh Mikhail Gyrdymov +13 位作者 Parysatis Tavana Robert Loetzsch Ingo Uschmann Thomas Siefke Thomas Käsebier Uwe Zeitner Adriana Szeghalmi Alexander Pukhov Dmitri Serebryakov Evgeni Nerush Igor Kostyukov Olga Rosmej Christian Spielmann Daniil Kartashov 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2026年第3期27-38,共12页
Long-lived hot and dense plasmas generated by ultra-intense laser beams are of critical importance for laser-driven nuclear physics,bright hard X-ray sources,and laboratory astrophysics.We report the experimental obse... Long-lived hot and dense plasmas generated by ultra-intense laser beams are of critical importance for laser-driven nuclear physics,bright hard X-ray sources,and laboratory astrophysics.We report the experimental observation of plasmas with nanosecond-scale lifetimes,near-solid density,and keV-level temperatures,produced by irradiating periodic arrays of composite nanowires with ultra-high-contrast relativistically intense femtosecond laser pulses.Jet-like plasma structures extending up to 1 mm from the nanowire surface were observed,emitting K-shell radiation from He-like Ti20+ions.High-resolution X-ray spectra have been analyzed using 3D particle-in-cell(PIC)simulations of the laser-plasma interaction combined with collisional-radiative modeling(FLYCHK).The results indicate that the jets consist of plasma with densities of 1020-1022cm-3and keV-scale temperatures,persisting for several nanoseconds.We attribute the formation of these jets to the generation of kilotesla-scale global magnetic fields during the laser interaction,as predicted by PIC simulations.These fields may drive long-timescale current instabilities that sustain magnetic fields of several hundred tesla,sufficient to confine hot,dense plasma over nanosecond durations. 展开更多
关键词 keV level temperatures composite nanowires femtosecond laser long lived plasmas nanosecond scale lifetimes ultra intense laser beams observation plasmas relativistic laser nanowire interaction
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Index-adapting cladding light stripper for high-power thulium fiber lasers 认领 引用
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作者 Tilman Lühder Till Walbaum Thomas Schreiber 《Advanced Photonics Nexus》 CSCD 2025年第6期45-55,共11页
Cladding light strippers(CLSs)are essential components for high-power monolithic fiber laser systems.Because they allow for bending of the fiber,which leads to an excellent stripping efficiency of light with a low ray... Cladding light strippers(CLSs)are essential components for high-power monolithic fiber laser systems.Because they allow for bending of the fiber,which leads to an excellent stripping efficiency of light with a low ray angle,refractive index-based CLSs have an advantage over the commonly used alternative approaches.However,conventional high-index CLSs overheat at relatively low input power as the maximum temperature,located in a hot-spot,increases linearly with the input power.This applies particularly to CLSs in thulium-based fiber systems,where very low power can already lead to extreme heat generation due to the high cladding material absorption around 2μm.Here,we investigate materials with a highly negative thermooptical coefficient combined with a refractive index closely above glass to distribute the stripped power and heat uniformly along an increased fiber length.Analyzing multiple CLS geometries for fiber diameters of 125 and 400μm,we show record-high maximum input powers for single-material CLSs of 21.8 W for the signal(2039 nm)and 675 W for the pump wavelength(793 nm).Transmitting excess light instead of overheating,this wavelength-adaptable self-protecting CLS concept is fast to apply onsite in the lab and reaches stripping efficiencies of>40 dB in the bent version. 展开更多
关键词 thulium cladding light stripper optical gel thermo-optical coefficient fiber laser
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Sub-nanometer address grid in variable shaped e-beam lithography for efficient inscription of high-precision large-area optical gratings 认领 引用
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作者 MARTIN HEUSINGER THORSTEN A.GOEBEL +9 位作者 MICHAEL BANASCH DANIEL RICHTER RIA G.KRÄMER CHRISTIAN VOIGTLÄNDER EIKE LINN THOMAS SIEFKE ANDREAS TÜNNERMANN ERNST-BERNHARD KLEY STEFAN NOLTE UWE D.ZEITNER 《Photonics Research》 SCIE EI CAS CSCD 2025年第12期3286-3294,共9页
High-performance, large-area optical gratings for applications like chirped pulse amplification, gravitational wave astronomy, and X-ray optics require sub-nanometer line placement control over several cm2. Electro... High-performance, large-area optical gratings for applications like chirped pulse amplification, gravitational wave astronomy, and X-ray optics require sub-nanometer line placement control over several cm2. Electron beam lithography with a variable shaped beam(VSB) is well suited but limited by tool-dependent address grid discretization. We adapted address grid interpolation to the VSB method, reducing the effective placement grid to 25 pm, as confirmed by stray light measurements. 展开更多
关键词 stray light measurements gravitational wave astronomy address grid address grid interpolation sub nanometer variable shaped e beam lithography electron beam lithography variable shaped beam vsb
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Tailorable spin-to-orbital angular momentum degree-of-freedom complete conversion with cascaded metasurfaces 认领 引用 被引量：1
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作者 SHIU HEI LAM JINYONG MA +1 位作者 THOMAS PERTSCH ANDREY A.SUKHORUKOV 《Photonics Research》 SCIE EI CAS CSCD 2026年第2期I0058-I0073,共16页
Spin-to-orbital angular momentum(OAM)conversion combined with the polarization shaping expands capabilities in optical communications and quantum optics.Whereas a single metasurface can create different OAMs depending... Spin-to-orbital angular momentum(OAM)conversion combined with the polarization shaping expands capabilities in optical communications and quantum optics.Whereas a single metasurface can create different OAMs depending on the input polarization,it cannot arbitrarily tailor output polarizations.We reveal how to overcome this limitation with cascaded metasurfaces,achieving complete control over the polarization and optical phase of OAMs combined with a near-unity efficiency,which can mediate the creation of quantum-entangled states.Our analytical framework of multi-channel OAM conversion predicts the optimal metasurface separation distance,and diffraction theory calculations confirm that the designed performance is preserved within nanofabrication tolerances. 展开更多
关键词 cascaded metasurfacesachieving quantum opticswhereas creation quan polarization shaping cascaded metasurfaces optical communications spin orbital angular momentum conversion
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GOBO projection for 3D measurements at highest frame rates: a performance analysis 认领 引用 被引量：7
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作者 Stefan Heist Patrick Dietrich +3 位作者 Martin Landmann Peter Kühmstedt Gunther Notni Andreas Tünnermann 《Light: Science & Applications》 SCIE EI CSCD 2018年第1期379-391,共13页
Aperiodic sinusoidal patterns that are cast by a GOBO(GOes Before Optics)projector are a powerful tool for optically measuring the surface topography of moving or deforming objects with very high speed and accuracy.We... Aperiodic sinusoidal patterns that are cast by a GOBO(GOes Before Optics)projector are a powerful tool for optically measuring the surface topography of moving or deforming objects with very high speed and accuracy.We optimised the first experimental setup that we were able to measure inflating car airbags at frame rates of more than 50 kHz while achieving a 3D point standard deviation of~500μm.Here,we theoretically investigate the method of GOBO projection of aperiodic sinusoidal fringes.In a simulation-based performance analysis,we examine the parameters that influence the accuracy of the measurement result and identify an optimal pattern design that yields the highest measurement accuracy.We compare the results with those that were obtained via GOBO projection of phase-shifted sinusoidal fringes.Finally,we experimentally verify the theoretical findings.We show that the proposed technique has several advantages over conventional fringe projection techniques,as the easy-to-build and cost-effective GOBO projector can provide a high radiant flux,allows high frame rates,and can be used over a wide spectral range. 展开更多
关键词 projection frame performance
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Polarization in quantum photonic sensing[Invited] 认领 引用
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作者 Luosha Zhang Chengjun Zou +2 位作者 Yu Wang Frank Setzpfandt Vira R.Besaga 《Chinese Optics Letters》 SCIE EI CAS CSCD 2025年第9期139-151,共13页
In this review,we address the emerging field of quantum photonic sensing leveraging the polarization degree of freedom.We briefly discuss the main aspects of treating polarization in quantum optics,and provide an over... In this review,we address the emerging field of quantum photonic sensing leveraging the polarization degree of freedom.We briefly discuss the main aspects of treating polarization in quantum optics,and provide an overview of the main trends in the development of the field and the strategies to realize quantum-enhanced polarization-based sensing as well as a comprehensive survey of the main advancements in the field.We aim at promoting quantum approaches to the researchers in classical optical polarimetry as well as underscoring the sustainability and resourcefulness of the field for prospective applications and attracting the researchers in quantum optics to this new emerging field. 展开更多
关键词 sensing polarization photonic quantum state quantum optics quantum photonic sensing
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Material-specific high-resolution table-top extreme ultraviolet microscopy 认领 引用 被引量：12
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作者 Wilhelm Eschen Lars Loetgering +9 位作者 Vittoria Schuster Robert Klas Alexander Kirsche Lutz Berthold Michael Steinert Thomas Pertsch Herbert Gross Michael Krause Jens Limpert Jan Rothhardt 《Light: Science & Applications》 SCIE EI CSCD 2022年第5期991-1000,共10页
Microscopy with extreme ultraviolet(EUV)radiation holds promise for high-resolution imaging with excellent material contrast,due to the short wavelength and numerous element-specific absorption edges available in this... Microscopy with extreme ultraviolet(EUV)radiation holds promise for high-resolution imaging with excellent material contrast,due to the short wavelength and numerous element-specific absorption edges available in this spectral range.At the same time,EUV radiation has significantly larger penetration depths than electrons.It thus enables a nano-scale view into complex three-dimensional structures that are important for material science,semiconductor metrology,and next-generation nano-devices.Here,we present high-resolution and material-specific microscopy at 13.5 nm wavelength.We combine a highly stable,high photon-flux,table-top EUV source with an interferometrically stabilized ptychography setup.By utilizing structured EUV illumination,we overcome the limitations of conventional EUV focusing optics and demonstrate high-resolution microscopy at a half-pitch lateral resolution of 16 nm.Moreover,we propose mixed-state orthogonal probe relaxation ptychography,enabling robust phase-contrast imaging over wide fields of view and long acquisition times.In this way,the complex transmission of an integrated circuit is precisely reconstructed,allowing for the classification of the material composition of mesoscopic semiconductor systems. 展开更多
关键词 resolution ultraviolet extreme
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