Journal: EPJ Web of Conferences

Abbreviation

EPJ Web Conf.

Publisher

EDP Sciences

Journal Volumes

ISSN

2100-014X
2101-6275

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2010 - 2019502020 - 202543
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Publications 1 - 10 of 93
  • Search for electric dipole moments
    Item type: Conference Paper
    Kirch, Klaus; Schmidt-Wellenburg, Philipp (2020)
    EPJ Web of Conferences ~ International Workshop on “Flavour Changing and Conserving Processes” (FCCP2019)
    Searches for permanent electric dipole moments of fundamental particles and systems with spin are the experiments most sensitive to new CP violating physics and a top priority of a growing international community. We briefly review the current status of the field emphasizing on the charged leptons and lightest baryons.
  • Linear and nonlinear elastic properties of dense granular packings: A DEM exploration
    Item type: Conference Paper
    Lemrich, Laure; Johnson, Paul; Guyer, Robert; et al. (2017)
    EPJ Web of Conferences
    Discrete Element Method modeling is used to study the frequency spectrum of particle motion in dense 3D packings of glass beads with Hertz-Mindlin contacts. Frequency sweeps show a dependency of the resonant frequencies on the drive amplitude and confining stress on the system, showing material changes in the system. The amplitude dependency of the second thickness mode 3λ/4 as identified by the internal strain field scales as f ∝ σ1/6 while the confining stress dependency scales as f ∝ σ 2/3, as predicted by Hertzian theory.
  • Coherent walk and lock in driven fast-gain frequency-combs
    Item type: Other Conference Item
    Heckelmann, Ina; Bertrand, Mathieu; Dikopoltsev, Alex; et al. (2023)
    EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)
    Locking multiple modes into a frequency comb is key for multiple metrological applications, and a great effort has been therefore invested in this challenge over the last decade. The most common techniques are based on either nonlinearities or modulation of the cavity, while the latter is considered the more controllable method to produce frequency combs. The modulation couples cavity modes and creates a lattice in a synthetic dimension with coherent walk dynamics, but typically these dynamics are overthrown by the dissipative processes, leading to a spectrum that is narrow relatively to the full frequency ladder potential. Here we propose and demonstrate that by using fast-gain we preserve the full potential of the coherent walk and lock the frequency comb at its maximum possible bandwidth. Moreover, we find in our system a unique regime of dissipative fast-gain Bloch oscillations. We demonstrate these dynamics in RF-modulated quantum cascade laser ring devices.
  • 50-W, >2-μJ SESAM-modelocked Ho:YAG thin-disk oscillator at 2.1 μm
    Item type: Other Conference Item
    Tomilov, Sergei; Wang, Yicheng; Hoffmann, Martin; et al. (2022)
    EPJ Web of Conferences ~ 10th EPS-QEOD Europhoton Conference on Solid-State, Fibre, and Waveguide Coherent Light Sources (EUROPHOTON 2022)
  • The Carbon Aerosol / Particles Nucleation with a Lidar: Numerical Simulations and Field Studies
    Item type: Conference Paper
    Miffre, Alain; Anselmo, Christophe; Francis, Mirvatte; et al. (2016)
    EPJ Web of Conferences
    In this contribution, we present the results of two recent papers [1,2] published in Optics Express, dedicated to the development of two new lidar methodologies. In [1], while the carbon aerosol (for example, soot particles) is recognized as a major uncertainty on climate and public health, we couple lidar remote sensing with Laser-Induced-Incandescence (LII) to allow retrieving the vertical profile of very low thermal radiation emitted by the carbon aerosol, in agreement with Planck’s law, in an urban atmosphere over several hundred meters altitude. In paper [2], awarded as June 2014 OSA Spotlight, we identify the optical requirements ensuring an elastic lidar to be sensitive to new particles formation events (NPF-events) in the atmosphere, while, in the literature, all the ingredients initiating nucleation are still being unrevealed [3]. Both papers proceed with the same methodology by identifying the optical requirements from numerical simulation (Planck and Kirchhoff’s laws in [1], Mie and T-matrix numerical codes in [2]), then presenting lidar field application case studies. We believe these new lidar methodologies may be useful for climate, geophysical, as well as fundamental purposes.
  • Influence of Disk Aberrations on High-Power Thin-Disk Laser Cavities
    Item type: Other Conference Item
    Seidel, Moritz; Lang, Lukas; Phillips, Christopher R.; et al. (2022)
    EPJ Web of Conferences ~ 10th EPS-QEOD Europhoton Conference on Solid-State, Fibre, and Waveguide Coherent Light Sources (EUROPHOTON 2022)
  • Ultra-Stable Broadband Comb Laser with Tunable Free Spectral Range and Spectra
    Item type: Conference Paper
    Marzban, Bahareh; Miller, Lucius; Dikopoltsev, Alex; et al. (2025)
    EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2025)
    We present a novel near-infrared broadband, flat-top optical frequency comb spanning 1.6 THz. This comb is generated using an interband gain medium operated in an ultrafast gain recovery regime within a unidirectional ring cavity. The remarkable stability of our approach is evidenced by a 1 Hz RF linewidth. The injected RF signal not only governs the spectral bandwidth and free spectral range but also tailors the comb-s spectral shape-a feat achieved by simultaneously injecting multiple modulation tones. This advanced level of control opens promising avenues for applications in communication, sensing, and ranging, where precise and stable frequency lines are essential for performance and reliability.
  • Benefits of Using Lode Angle Dependent Fracture Models to Predict Ballistic Limits of Armor Steel
    Item type: Conference Paper
    Roth, Christian C.; Fras, Teresa; Faderl, Norbert; et al. (2018)
    EPJ Web of Conferences ~ DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
    Ductile fracture experiments are carried out at different stress states, strain rates and temperatures on a range of flat Mars 300 steel specimens to calibrate both a plasticity and a fracture model. To predict the onset of fracture a stress state and strain rate-dependent Hosford–Coulomb fracture initiation model is used. Single material impact experiments are performed on targets of homogenous and perforated Mars 300 plates by accelerating cylindrical Mars 300 impactors in a single-stage gas gun. It is shown that the chosen modeling approach allows accurate modeling of the plastic response as well as the fracture patterns.
  • Continuous-wave and SESAM mode-locked 2.3-µm Tm:LiYF₄ lasers: Upconversion pumping at 1.45 µm
    Item type: Other Conference Item
    Bae, Ji Eun; Gaulke, Marco; Loiko, Pavel; et al. (2024)
    EPJ Web of Conferences ~ 11th EPS-QEOD Europhoton Conference on Solid-State, Fibre, and Waveguide Coherent Light Sources (EUROPHOTON 2024)
    A Tm:LiYF4 laser operating on the 3H4→3H5 transition with upconversion pumping at 1.45 µm generates 831 mW at 2313 nm with 34.0% slope efficiency. Mode-locked by a GaSb-based SESAM, it delivers 855-fs pulses at 104.4-MHz.
  • Search for supersymmetry in events with a Z boson, jets and missing energy
    Item type: Conference Paper
    Buchmann, Marco A. (2012)
    EPJ Web of Conferences
    We present a search for Physics beyond the Standard Model (SM) in final states with a Z boson, jets and missing transverse energy, using a data sample collected in 2011 by the CMS detector at the Large Hadron Collider corresponding to an integrated luminosity of 2.1 fb−1. This final state is predicted in several models of Physics beyond the SM, including supersymmetry. A novel analysis method is exploited, the Jet-Z Balance method, and a precise determination of the total SM background is obtained using a control sample from data. In the absence of any significant excess beyond the SM background, upper limits are set on simple models of supersymmetry, and further information is provided to allow confrontation of other models to these results.
Publications 1 - 10 of 93