Tootfinder

Youtuber entwickelt stärksten Hand-Laser der Welt
Youtuber StyroPyro hat die Leistung eines tragbaren Lasers auf 250 Watt hochgeschraubt. Damit ist er wohl der weltweit stärkste Hand-Laser.
https://www.…

Agile laser wavelength tuning using dynamic targeting
Robbe de Mey, Spencer W. Jolly, Alexandre Locquet, Martin Virte
https://arxiv.org/abs/2506.02861 http…

Agile laser wavelength tuning using dynamic targeting
Tunable lasers are essential and versatile tools in photonics, with applications spanning telecommunications, spectroscopy, and sensing. Advancements have aimed to expand tuning ranges, suppress mode hopping, and enable photonic integration. In this work, we explore the adaptation of dynamic targeting, a technique originally developed to stabilize lasers under optical feedback, as a method for achieving agile, fast, and continuous wavelength tuning. By adjusting the feedback rate and phase, we …

Der Laser besteht aus Komponenten, die StyroPyro auf eBay erworben hat, darunter ein ausgemustertes Laser-Array aus blauen Laser-Dioden. 🔥
Zum Artikel: https://heise.de/-10423253?wt_mc=sm.red.ho.mastodon.mastodon.md_be…

As we prepare for colorful explosions in the United States, I remembered I wanted to share colorful lasers confetti I saw a few months ago at Gareth Emery's LSR/City show.
I have a singular RGB laser with ILDA interface USB DAC that I've played with a little over a year ago. Someday I'd like to drive it with code.

China’s quantum satellite can be hacked, Singapore-based scientist warns
https://www.scmp.com/news/china/science/article/3312399/chinas-quantum-satellite-can-be-hacked-sing…

China’s quantum satellite can be hacked, Singapore-based scientist warns
Hackers could intercept coded messages sent by lasers on China’s quantum communication network, research suggests.

Diagnosing the impact of relativistically intense prepulse on few-picosecond timeframes for short scale length laser-matter interactions
H. M. Huddleston, M. Yeung, C. R. J. Fitzpatrick, J. P. Kennedy, S. Palaniyppan, R. Shah, D. C. Gautier, M. Zepf, J. C. Fernandez, B. M. Hegelich, B. Dromey
https://arxiv.org/abs/2506.02798

Diagnosing the impact of relativistically intense prepulse on few-picosecond timeframes for short scale length laser-matter interactions
With the rapid proliferation of multi-petawatt (MPW) lasers globally, a new era of high-energy density science promises to emerge within the next decade. However, precise control over how light at these ultra-relativistic intensities interacts with matter (especially with solid-density targets) will be crucial to fully realize the cutting-edge scientific advancements and technological breakthroughs that the MPW regime promises to unlock. In this manuscript, we present experimental results, supp…

Tailoring the resonant spin response of a stirred polariton condensate
Ivan Gnusov, Alexey Yulin, Stepan Baryshev, Sergey Alyatkin, Pavlos G. Lagoudakis
https://arxiv.org/abs/2506.03953

Tailoring the resonant spin response of a stirred polariton condensate
We report on the enhancement of the spin coherence time (T2) by almost an order-of-magnitude in exciton-polariton condensates through driven spin precession resonance. Using a rotating optical trap formed by a bichromatic laser excitation, we synchronize the trap stirring frequency with the condensate intrinsic Larmor precession, achieving an order of magnitude increase in spin coherence. By tuning the optical trap profile via excitation lasers intensity, we precisely control the resonance widt…

Time Crystal in the Nonlinear Phonon Mode of the Trapped Ions
Yi-Ling Zhan, Chun-Fu Liu, J. -T. Bu, K. -F Cui, S. -L. Su, L. -L. Yan, Gang Chen
https://arxiv.org/abs/2507.01528

Time Crystal in the Nonlinear Phonon Mode of the Trapped Ions
Time crystals constitute a novel phase of matter defined by the spontaneous breaking of time-translation symmetry. We present a scheme for realizing a continuous-time crystal using the vibrational phonon mode of a trapped-ion system. By coupling two addressable standing-wave lasers to individual ions via adiabatic elimination, we generate a nonlinear phonon mode with controllable linear gain ($g$) and nonlinear damping ($κ$). This scheme enables stable dissipative dynamics over timescales sign…

«Lidar Lasers on Volvo SUV Fries Smartphone Camera Sensor»
As I'm not that kind of biologist (anymore): is there anything known about the impact of IR light pollution on wildlife?
/cc @… as you'd be my closest guess for someone who could know 😅
https://petapixel.com/2025/05/20/lidar-lasers-on-volvo-suv-fries-smartphone-camera-sensor/

«Lidar Lasers on Volvo SUV Fries Smartphone Camera Sensor»
As I'm not that kind of biologist (anymore): is there anything known about the impact of IR light pollution on wildlife?
/cc @… as you'd be my closest guess for someone who could know 😅
https://petapixel.com/2025/05/20/lidar-lasers-on-volvo-suv-fries-smartphone-camera-sensor/

Optical frequency division referenced to microhertz-linewidth quantum-noise-limited lasers
Jiahao Hu, Yanlan Xiao, Honglei Yang, Siyi Xue, Wenchan Dong, Kunpeng Zhai, Sha Zhu, Kun Qiu, Shengkang Zhang, Jun Ge, Ninghua Zhu, Xiaoshun Jiang, Jing Xu, Huashun Wen, Heng Zhou
https://arxiv.org/abs/2505.24557

Optical frequency division referenced to microhertz-linewidth quantum-noise-limited lasers
Optical frequency division (OFD) implements the conversion of ultra-stable optical frequencies into microwave frequencies through an optical frequency comb flywheel, generating microwave oscillators with record-low phase noise and time jitter. However, conventional OFD systems face significant trade-off between division complexity and noise suppression due to severe thermal noise and technical noise in the optical frequency references. Here, we address this challenge by generating common-cavity…

This https://arxiv.org/abs/2505.16768 has been replaced.
initial toot: https://mastoxiv.page/@arX…

High-Efficiency Plasma-Based Compressor for Ultrafast Soft X-ray Free-Electron Lasers
The generation of intense, femtosecond-scale X-ray pulses is crucial for probing matter under extreme temporal and field conditions. Current chirped-pulse amplification (CPA) techniques in free-electron lasers (FELs), however, face efficiency limitations in the soft X-ray regime due to the inherent constraints of conventional optical compressors. To address this challenge, we propose a high-efficiency plasma-based compressor utilizing highly ionized noble gas plasma. Exploiting strong refractiv…

High-charge relativistic electrons by vacuum laser acceleration from plasma mirrors using flying focus pulses
Jiaxin Liu, Zeyue Pang, Hehanlin Wang, Zi-Yu Chen
https://arxiv.org/abs/2505.24614

High-charge relativistic electrons by vacuum laser acceleration from plasma mirrors using flying focus pulses
Relativistic electron beams produced by intense lasers over short distances have important applications in high energy density physics and medical technologies. Vacuum laser acceleration with plasma mirrors injectors has garnered substantial research interest recently. However, a persistent challenge remains unresolved that electrons inevitably detach from the laser acceleration phase due to velocity mismatch. Here, we employ flying focus lasers to address this limitation. Through three-dimensi…

A new beamline for Resonant Excitation of Beams with Electromagnetic fields and Lasers (REBEL) and Stopping and Trapping of Radioactive Isotopes for Precision Experiments (STRIPE)
Phillip Imgram, Dinko Atanasov, Michail Athanasakis-Kaklamanakis, Paul Van den Bergh, Tobias Christen, Ruben de Groote, \'Agota Koszor\'us, Gerda Neyens, Stefanos Pelonis

A new beamline for Resonant Excitation of Beams with Electromagnetic fields and Lasers (REBEL) and Stopping and Trapping of Radioactive Isotopes for Precision Experiments (STRIPE)
We present two newly constructed experimental setups - REBEL (Resonant Excitation of Beams with Electromagnetic fields and Lasers) and STRIPE (Stopping and Trapping of Radioactive Isotopes for Precision Experiments) - integrated into a single offline beamline at KU Leuven. REBEL is designed for collinear laser spectroscopy of ion bunches following isobaric separation with a multireflection time-of-flight mass spectrometer, enabling high-sensitivity measurements of mass-selected fast-ion beams. …

This https://arxiv.org/abs/2501.12912 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Quantification of Ultrafast Nonlinear Photothermal and Photoacoustic Effects in Molecular Thin Films via Time-Domain Brillouin Scattering
Improving the efficiency of photothermal (PT) therapies and photoacoustic (PA) imaging at the microscopic scale hinges on developing multiphoton-absorbing photothermal molecules or contrast agents that operate in the near-infrared (NIR) range. These advanced agents or molecules will enable excitation with NIR lasers, in an improved transparency range for biological tissues, while enabling minute, highly localized spatial control of the excitation area. However, progress in this field requires i…

Reaching extreme fields in laser-electron beam collisions with XUV laser light
Brandon K. Russell, Christopher P. Ridgers, Stepan S. Bulanov, Kyle G. Miller, Christopher Arran, Thomas G. Blackburn, Sergei V. Bulanov, Gabriele M. Grittani, John P. Palastro, Qian Qian, Alexander G. R. Thomas
https://arxiv.org/abs/2506.01727…

Reaching extreme fields in laser-electron beam collisions with XUV laser light
Plasma-based particle accelerators promise to extend the revolutionary work performed with conventional particle accelerators to studies with smaller footprints, lower costs, and higher energies. Here, we propose a new approach to access an unexplored regime of strong-field quantum electrodynamics by plasma wakefield acceleration of both charged particles and photons. Instead of using increasingly powerful accelerators and lasers, we show that photon acceleration of optical pulses into the extr…

POST: Photonic Swin Transformer for Automated and Efficient Prediction of PCSEL
Qi Xin, Hai Huang, Chenyu Li, Kewei Shi, Zhaoyu Zhang
https://arxiv.org/abs/2507.01316

POST: Photonic Swin Transformer for Automated and Efficient Prediction of PCSEL
This work designs a model named POST based on the Vision Transformer (ViT) approach. Across single, double, and even triple lattices, as well as various non-circular complex hole structures, POST enables prediction of multiple optical properties of photonic crystal layers in Photonic Crystal Surface Emitting Lasers (PCSELs) with high speed and accuracy, without requiring manual intervention, which serves as a comprehensive surrogate for the optical field simulation. In the predictions of Qualit…

'Mic drop': on estimating the size of sub-mm droplets using a simple condenser microphone
Avshalom Offner
https://arxiv.org/abs/2506.19782 https://…

'Mic drop': on estimating the size of sub-mm droplets using a simple condenser microphone
The size distribution of aerosol droplets is a key parameter in a myriad of processes, and it is typically measured with optical aids (e.g., lasers or cameras) that require sophisticated calibration, thus making the measurement cost intensive. We developed a new method to indirectly measure the size of small droplets using off-the-shelf <\$1 electret microphones. In this method we exploit the natural oscillations that small droplets undergo after impacting a flat surface: by allowing droplets t…

Carrier Transport in Electrically-Driven Photonic Crystal Membrane Lasers
Mathias Marchal, Evangelos Dimopoulos, Kasper Spiegelhauer, Nikolaos Chatzaras, Marco Saldutti, Kresten Yvind, Yi Yu, Jesper M{\o}rk
https://arxiv.org/abs/2506.19111

Carrier Transport in Electrically-Driven Photonic Crystal Membrane Lasers
We model carrier transport in photonic crystal lasers with lateral current injection through two-dimensional (2D) finite-volume simulations. Though such lasers can achieve ultra-low threshold currents, leakage paths reduce the carrier injection efficiency. The design is evaluated through its performance in terms of injection efficiency, internal quantum efficiency, and IV characteristics. Our model predicts the presence of unconventional leakage paths, explaining experimental observations of lo…

This https://arxiv.org/abs/2505.16768 has been replaced.
initial toot: https://mastoxiv.page/@arX…

High-Efficiency Plasma-Based Compressor for Ultrafast Soft X-ray Free-Electron Lasers
The generation of intense, femtosecond-scale X-ray pulses is crucial for probing matter under extreme temporal and field conditions. Current chirped-pulse amplification (CPA) techniques in free-electron lasers (FELs), however, face efficiency limitations in the soft X-ray regime due to the inherent constraints of conventional optical compressors. To address this challenge, we propose a high-efficiency plasma-based compressor utilizing highly ionized noble gas plasma. Exploiting strong refractiv…

Complete Catalog of Laser Locking Configurations for LISA
Gerhard Heinzel, Javier \'Alvarez-Vizoso, Miguel Dovale-\'Alvarez
https://arxiv.org/abs/2505.22406

Complete Catalog of Laser Locking Configurations for LISA
The Laser Interferometer Space Antenna (LISA) will enable direct observations of low-frequency gravitational waves, offering unprecedented insight into astrophysical and cosmological phenomena. LISA's heterodyne interferometric measurement system requires phase-locking five of its six onboard lasers with tunable frequency offsets to ensure that all beatnotes remain within the metrology system's operational range, despite Doppler-induced frequency shifts. The selection of these offset frequencie…

Fully stabilized Er fiber comb at 1 GHz by harmonic modelocking
Kevin F. Lee (IMRA America, Inc.), Jacob Lampen (IMRA America, Inc.), Peng Li (IMRA America, Inc.), Jie Jiang (IMRA America, Inc.), Martin E. Fermann (IMRA America, Inc.)
https://arxiv.org/abs/2507.00233

Fully stabilized Er fiber comb at 1 GHz by harmonic modelocking
Modelocked frequency comb lasers have always operated with a single pulse circulating in the laser cavity. This meant that each laser technology had an associated limit on pulse repetition rate. Achieving higher rates required different technology, for example exchanging optical fiber for solid state gain media. However, this is a perceived, rather than a fundamental limit. We demonstrate a new fiber laser design with multiple pulses circulating in the fiber gain cavity with the same high preci…

The Darkfield Approach to Measuring Vacuum Birefringence and Light-by-Light Couplings -- A Proof-of-Principle Experiment
Michal Sm\'id, Pooyan Khademi, Carsten B\"ahtz, Erik Brambrink, Jindrich Chalupsky, Tom E. Cowan, Samuele Di Dio Cafiso, Sebastian G\"ode, J\"org Grenzer, Vera Hajkova, Peter Hilz, Willi Hippler, Hauke H\"opner, Alzbeta Horynova, Oliver Humphries, Simon Jelinek, Libor Juha, Felix Karbstein, Alejandro Laso-Garcia, Robert L\"otzsch, Aim\…

The Darkfield Approach to Measuring Vacuum Birefringence and Light-by-Light Couplings -- A Proof-of-Principle Experiment
Vacuum fluctuations give rise to effective nonlinear interactions between electromagnetic fields. These generically modify the characteristics of light traversing a strong-field region. X-ray free-electron lasers constitute a particularly promising probe, due to their brilliance, the possibility of precise control and favourable frequency scaling. However, the nonlinear vacuum response is very small even when probing a tightly focused high-intensity laser field with XFEL radiation and direct me…

This https://arxiv.org/abs/2411.17443 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Electro-optically tunable Brillouin microlasers on lithium niobate platform
Miniature, monolithic, tunable sources of coherent radiation with narrow linewidths and low noise are highly sought after for photonic integration. Brillouin lasers, known for their intrinsically narrow linewidths, present an appealing solution. However, achieving the strong optomechanical coupling necessary for lasing in optical microresonators remains challenging due to the difficulty of simultaneously confining optical and acoustic modes with substantial modal overlap. Additionally, most Bri…

Optical absorption in hexagonal-diamond Si and Ge nanowires: insights from STEM-EELS experiments and ab initio theory
Luiz H. G. Tizei, Michele Re Fiorentin, Thomas Dursap, Theodorus M. van den Berg, Marc T\'unica, Maurizia Palummo, Mathieu Kociak, Laetitia Vincent, Michele Amato
https://arxiv.org/abs/2506.10543

Optical absorption in hexagonal-diamond Si and Ge nanowires: insights from STEM-EELS experiments and ab initio theory
Hexagonal-diamond (2H) group IV nanowires are key for advancing group IV-based lasers, quantum electronics, and photonics. Understanding their dielectric response is crucial for performance optimization, but their optical absorption properties remain unexplored. We present the first comprehensive study of optical absorption in 2H-Si and 2H-Ge nanowires, combining high-resolution STEM, monochromated EELS, and ab initio simulations. The nanowires, grown in situ in a TEM as nanobranches on GaAs st…

High-Efficiency Plasma-Based Compressor for Ultrafast Soft X-ray Free-Electron Lasers
Mingchang Wang, Li Zeng, Bingbing Zhang, Qinghao Zhu, Xiaozhe Shen, Xiaofan Wang, Qinming Li, Weiqing Zhang
https://arxiv.org/abs/2505.16768

High-Efficiency Plasma-Based Compressor for Ultrafast Soft X-ray Free-Electron Lasers
The generation of intense, femtosecond-scale X-ray pulses is crucial for probing matter under extreme temporal and field conditions. Current chirped-pulse amplification (CPA) techniques in free-electron lasers (FELs), however, face efficiency limitations in the soft X-ray regime due to the inherent constraints of conventional optical compressors. To address this challenge, we propose a high-efficiency plasma-based compressor utilizing highly ionized noble gas plasma. Exploiting strong refractiv…

Synchronization of lasers with complex spatio-temporal dynamics
Jules Mercadier, Stefan Bittner, Marc Sciamanna
https://arxiv.org/abs/2506.15351 https://…

Synchronization of lasers with complex spatio-temporal dynamics
Synchronization is among the most fascinating dynamical behaviors through which oscillators like lasers align their temporal dynamics under weak coupling. So far, experimental studies have been restricted to lasers exhibiting structured temporal dynamics, such as periodic, mode-locked, or chaotic regimes, the latter usually induced by feedback or optical injection. We now successfully achieve synchronization of two spatially extended lasers with intrinsically chaotic dynamics. We observe synchr…

This https://arxiv.org/abs/2502.20014 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Monitoring microplastics in live reef-building corals with microscopic laser particles
Micro- and nanoplastics pose a growing threat to reef-building corals. Yet, understanding of their uptake, interaction with coral tissue and long-term incorporation into coral skeletons remains limited in large part due to the invasive nature of existing methods for monitoring and localizing microplastic. Here, we repurpose optical resonances in polymer spheres to transform microplastic particles into microscopic lasers. These laser particles emit distinctive and stable spectral signatures that…

Time-resolved and three-dimensional elucidation of the complex refractive index alteration induced by ultrashort laser pulses
Takumi Koike, Yusuke Ito, Naohiko Sugita
https://arxiv.org/abs/2506.22582

Time-resolved and three-dimensional elucidation of the complex refractive index alteration induced by ultrashort laser pulses
Ultrashort pulse lasers (USPLs) have attracted attention as tools capable of inducing unique phenomena by instantaneously generating regions with transiently modified properties (filaments) in the material. However, a comprehensive understanding of USPL-induced filaments remains elusive due to the complexity of their dynamics and insufficient imaging techniques to accurately capture them. In this study, we propose a novel methodology to measure the transient complex refractive index of filament…

Stochastic modeling of deterministic laser chaos using generator extended dynamic mode decomposition
Kakutaro Fukushi, Jun Ohkubo
https://arxiv.org/abs/2506.05798

Stochastic modeling of deterministic laser chaos using generator extended dynamic mode decomposition
Recently, chaotic phenomena in laser dynamics have attracted much attention to its applied aspects, and a synchronization phenomenon, leader-laggard relationship, in time-delay coupled lasers has been used in reinforcement learning. In the present paper, we discuss the possibility of capturing the essential stochasticity of the leader-laggard relationship; in nonlinear science, it is known that coarse-graining allows one to derive stochastic models from deterministic systems. We derive stochast…

Spectral-filtering-induced phase transition in passively mode-locked fiber lasers
Oumaima Ougrige, Florent Bessin, Charles Ciret, Herve Leblond, Fran\c{c}ois Sanchez
https://arxiv.org/abs/2506.18468

Spectral-filtering-induced phase transition in passively mode-locked fiber lasers
We investigate the effect of a tunable spectral filter on the dynamics of a passively mode-locked fiber laser in the anomalous dispersion regime. The results show that noise-like pulse emission evolves toward bound-state regime as the filter bandwidth is reduced. Thanks to the Shannon entropy applied to dispersive Fourier transform signals, it is demonstrated that the system undergoes a phase transition.

Electrically reconfigurable extended lasing state in an organic liquid-crystal microcavity
Dmitriy Dovzhenko (School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom), Luciano Siliano Ricco (Science Institute, University of Iceland, Reykjavik, Iceland), Krzysztof Sawicki (School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom), Marcin Muszy\'nski (Institute of Experimental Physics, Faculty of Physics, University of Wa…

Electrically reconfigurable extended lasing state in an organic liquid-crystal microcavity
Small-footprint, low-power arrays of coupled coherent emitters with the capability of near- and far-field engineering and coherence control are highly sought after to meet modern nanophotonics evolving needs. Between existing solutions based on vertical-cavity surface-emitting lasers, phase masks in bulk traditional cavity-based systems, and lattices of exciton-polariton condensates, only the strongly light-matter coupled systems were shown to be capable of controlled on-chip interaction betwee…

Hybrid chaos synchronization between a ring and line topologies
Elman Shahverdiev
https://arxiv.org/abs/2506.05562 https://arxiv.org/…

Hybrid chaos synchronization between a ring and line topologies
Hybrid chaos synchronization between ring-line networks topologies is explored on the example of Ikeda modeling, famous multidisciplinary system. It is established that high quality complete synchronization between constituent lasers is a possibility. Some security implications for the computer network hybrid topology are underlined.

Silicon Nitride Microresonator Raman Lasers
Yi Zheng, Haoyang Tan, Andreas Jacobsen, Yang Liu, Chaochao Ye, Yanjing Zhao, Cheng Xiang, Kresten Yvind, Minhao Pu
https://arxiv.org/abs/2506.12658

Silicon Nitride Microresonator Raman Lasers
Silicon nitride (SiN) has emerged as a promising platform for integrated nonlinear photonics because of its low propagation loss, wide transparency window, and CMOS compatibility. Nonlinear processes arising from photon-electron interactions, such as Kerr frequency comb generation and second harmonic generation, have been extensively explored. In contrast, photon-phonon interaction-based nonlinearities, such as stimulated Raman scattering, remain largely unexplored in this integrated platform, …

Some features in 4-level generation in LIPLs
Lev Nagli, Kirill Kulikov, Dima Cheskis
https://arxiv.org/abs/2506.07220 https://arxiv.o…

Some features in 4-level generation in LIPLs
This paper shows that in Laser-Induced Plasma Lasers (LIPL), the collisionally assisted transitions that lead to the inversion population on an upper-generation level E_up may be partly forbidden. The spin-orbit coupling may increase the oscillator strength of such transitions. It also demonstrates that collisions between electrons and excited atoms can strongly increase the atoms' energy, creating a population inversion at the E_up level, which may lie about 1 eV above the …

Efficient first-principles inverse design of nanolasers
Be\~nat Martinez de Aguirre Jokisch, Alexander Cerjan, Rasmus Elleb{\ae}k Christiansen, Jesper M{\o}rk, Ole Sigmund, Steven G. Johnson
https://arxiv.org/abs/2506.20223

Efficient first-principles inverse design of nanolasers
We develop and demonstrate a first-principles approach, based on the nonlinear Maxwell-Bloch equations and steady-state ab-initio laser theory (SALT), for inverse design of nanostructured lasers, incorporating spatial hole-burning corrections, threshold effects, out-coupling efficiency, and gain diffusion. The resulting figure of merit exploits the high-$Q$ regime of optimized laser cavities to perturbatively simplify the nonlinear model to a single linear ''reciprocal'' Maxwell solve. The cons…

First Lasing and Stable Operation of a Direct-Amplification Enabled Harmonic Generation Free-Electron laser
Zheng Qi, Junhao Liu, Lanpeng Ni, Tao Liu, Zhen Wang, Kaiqing Zhang, Hanxiang Yang, Zhangfeng Gao, Nanshun Huang, Si Chen, Hang Luo, Yaozong Xiao, Cheng Yu, Yongmei Wen, Fei Gao, Yangyang Lei, Huan Zhao, Yanyan Zhu, Liping Sun, Weiyi Yin, Xingtao Wang, Taihe Lan, Xiaoqing Liu, Lie Feng, Wenyan Zhang, Ximing Zhang, Bin Li, Chao Feng, Bo Liu, Zhentang Zhao

First Lasing and Stable Operation of a Direct-Amplification Enabled Harmonic Generation Free-Electron laser
Seeded free-electron lasers (FELs) capable of operating at repetition rates up to the MHz level are in high demand for advanced time-resolved spectroscopies, which require both full longitudinal coherence and high average photon flux in the extreme ultraviolet (EUV) and x-ray regimes. However, conventional external-seed laser systems cannot sustain MHz operation with sufficient hundreds of megawatts peak power requirement due to their limited total power. Here, we report the first lasing and st…

Room temperature spin injection into commercial VCSELs at non-resonant wavelengths
Timur Almabetov, Petros Androvitsaneas, Zhongze Ren, Andrew Young, Ruth Oulton, Edmund Harbord
https://arxiv.org/abs/2506.18376

Room temperature spin injection into commercial VCSELs at non-resonant wavelengths
Spin lasers leverage electron spin-polarisation to control photon polarisation, offering the potential for lower thresholds, rapid modulation, and all-optical data processing. We report successful spin injection into a commercial Vertical Cavity Surface Emitting Laser (VCSEL) using optical pumping at wavelengths of 794 nm and 810 nm. Maximum circular polarisation achieved was about 20% at 794 nm, whereas this falls to 5% with exciting at 810 nm. We attribute this to reduced spin injection due t…

Empirical scaling laws for self-focused laser pulses in nitrogen plasmas
Lorenzo Martelli, Igor Andriyash, Jonathan Wheeler, Henri Kraft, Xuan Quyen Dinh, C\'edric Thaury
https://arxiv.org/abs/2506.04827

Empirical scaling laws for self-focused laser pulses in nitrogen plasmas
We investigate the interaction between a superintense laser pulse and a nitrogen plasma with densities exceeding $10^{19}\,$cm$^{-3}$, using particle-in-cell simulations. Such configurations have recently demonstrated the capability to produce highly charged electron beams (i.e., $>10\,$nC) with $1\,$J-class lasers, a significant step toward high-average-current laser-plasma accelerators. Our study focuses on analyzing the impact of laser self-focusing on laser dynamics, leading to scaling laws…

Universality and non-differentiability: A new perspective on angular dispersion in optics
Layton A. Hall, Murat Yessenov, Kenneth L. Schepler, Ayman F. Abouraddy
https://arxiv.org/abs/2506.18858

Universality and non-differentiability: A new perspective on angular dispersion in optics
Angular dispersion (AD) is a ubiquitous phenomenon in optics after light traverses a diffractive or dispersive device, whereby each wavelength propagates at a different angle. AD is useful in a variety of applications; for example, modifying the group velocity or group-velocity dispersion of pulsed lasers in free space or optical materials, which are essential ingredients in group-velocity matching and dispersion compensation. Conventional optical components introduce `differentiable' AD, so th…

Influence of optical self-injection on statistical properties of laser-pulse interference
Roman Shakhovoy, Elizaveta Maksimova, Matvey Boltanskiy, Maxim Fadeev
https://arxiv.org/abs/2506.17037

Influence of optical self-injection on statistical properties of laser-pulse interference
Pulsed optical self-injection markedly affects the emission characteristics of semiconductor lasers. In this work, we analyze its influence on the statistical properties of laser-pulse interference. We experimentally demonstrate that varying the arrival time of reflected optical pulses back into the laser cavity influences the phase-diffusion and induces an effect that, by analogy with external optical injection, we call phase locking. A comprehensive theoretical analysis of this phenomenon is …

Visible Brillouin-quadratic microlaser in a high-Q thin-film lithium niobate microdisk
Xiaochao Luo, Chuntao Li, Xingzhao Huang, Jintian Lin, Renhong Gao, Yifei Yao, Yingnuo Qiu, Yixuan Yang, Lei Wang, Huakang Yu, Ya Cheng
https://arxiv.org/abs/2506.08615

Visible Brillouin-quadratic microlaser in a high-Q thin-film lithium niobate microdisk
Narrow-linewidth lasers at short/visible wavelengths are crucial for quantum and atomic applications, such as atomic clocks, quantum computing, atomic and molecular spectroscopy, and quantum sensing. However, such lasers are often only accessible in bulky tabletop systems and remain scarce in integrated photonic platform. Here, we report an on-chip visible Brillouin-quadratic microlaser in a 117-um-diameter thin-film lithium niobate (TFLN) microdisk via dispersion engineering. Enabled by the ul…

AttoSHINE: Generation of continuous-wave terawatt-scale attosecond X-ray pulses at SHINE
Bingyang Yan, Chenzhi Xu, Si Chen, Duan Gu, Ye Chen, Jiawei Yan, Haixiao Deng
https://arxiv.org/abs/2506.07213

AttoSHINE: Generation of continuous-wave terawatt-scale attosecond X-ray pulses at SHINE
Attosecond X-ray pulses are a critical tool for tracking ultrafast electron dynamics in condensed matter, molecular systems, and strongly correlated materials. Recent breakthroughs have pushed X-ray free electron lasers (XFELs) into the attosecond domain, significantly surpassing their previous femtosecond capabilities. Building on these advancements, this work investigates the potential of the Shanghai High Repetition Rate XFEL and Extreme Light Facility (SHINE), China's first continuous-wave …

Artificial Gauge Fields and Dimensions in a Polariton Hofstadter Ladder
Simon Widmann, Jonas Bellmann, Johannes D\"ureth, Siddhartha Dam, Christian G. Mayer, Philipp Gagel, Simon Betzold, Monika Emmerling, Subhaskar Mandal, Rimi Banerjee, Timothy C. H. Liew, Ronny Thomale, Sven H\"ofling, Sebastian Klembt
https://arxiv…

Artificial Gauge Fields and Dimensions in a Polariton Hofstadter Ladder
Artificial gauge fields allow uncharged particles to mimic the behavior of charged particles subjected to magnetic fields, providing a powerful platform for exploring topological physics. Neutral particles, like photons, are typically unaffected by real magnetic fields. However, it is possible to introduce artificial gauge fields that control the effective dynamics of these neutral particles. Topological exciton-polariton lasers have attracted considerable interest, in part due to the wide rang…

Brillouin-Mandelstam scattering in telecommunications optical fiber at millikelvin temperatures
E. A. Cryer-Jenkins, A. C. Leung, H. Rathee, A. K. C. Tan, K. D. Major, M. R. Vanner
https://arxiv.org/abs/2506.09654

Brillouin-Mandelstam scattering in telecommunications optical fiber at millikelvin temperatures
Brillouin-Mandelstam scattering is a strong and readily accessible optical nonlinearity enabling a wide array of applications and research directions. For instance, the three-wave mixing process has been employed to great success for narrow-linewidth lasers, sensing applications, microscopy, and signal processing. While most of these avenues focus on room temperature operation, there is now increasing interest in cryogenic operation owing to the scattering mechanism's significant potential for …