Dr. Samuel R. Yoffe Profile

Dr. Samuel R. Yoffe

at Univ of Strathclyde

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Author

Publications (17)

Proceedings Article | 20 April 2021 Presentation

Radiation emitter generated by interacting Langmuir waves

Min Sup Hur, Manoj Kumar, Hyungseon Song, Teyoun Kang, Sam Yoffe, Bernhard Ersfeld, Dino Jaroszynski, Paulo Castillo, Kwangmin Yu

Proceedings Volume 11778, 117780D (2021) https://doi.org/10.1117/12.2592507

KEYWORDS: Plasma, Photonic integrated circuits, Oscillators, Solids, Scattering, Optical simulations, Laser scattering, Electromagnetic scattering, Electromagnetic radiation, Antennas

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Proceedings Article | 18 April 2021 Presentation + Paper

Investigations into the volume plasma density grating waveplate

George Holt, Gregory Vieux, Bernhard Ersfeld, Samuel Yoffe, James Feehan, Enrico Brunetti, Min Sup Hur, Dino Jaroszynski

Proceedings Volume 11778, 117780M (2021) https://doi.org/10.1117/12.2595298

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Proceedings Article | 18 April 2021 Presentation

Enhanced scattering from a locally produced transient plasma grating in a plasma-based amplifier

Gregory Vieux, Silvia Cipiccia, Gregor Welsh, Sam Yoffe, Felix Gaertner, Matthew Tooley, Bernhard Ersfeld, Enrico Brunetti, Bengt Eliasson, MinSup Hur, Joao Dias, Thomas Kuehl, Dino Jaroszynski

Proceedings Volume 11778, 117780L (2021) https://doi.org/10.1117/12.2595297

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The increasing demand for high laser powers is placing huge demands on current laser technology. This is now reaching a limit, and to realise new areas of research promised at high intensities, new cost-effective and technically feasible ways of scaling up the laser power and controlling its optical characteristics are required. It is likely that ultra-compact, time-dependent, plasma-based amplifiers and optical elements (such as mirrors, polarisers, waveplates, etc.) will be required to reach powers exceeding tens of petawatts and possibly exawatts, and to manipulate the laser beams. Plasma is a robust optical medium as it is broken-down and can sustain extremely high electric fields. Plasma-based optical elements will most likely require the production of transient plasma gratings (TPGs), which take advantage of the ponderomotive force of the beat of at least two laser pulses. To create an amplifier, the TPG is formed through the action of the beat wave of a pump and seed pulse, which has a phase velocity satisfying the conditions for energy and momentum conservation of the three waves, where the third wave is a Langmuir or ion acoustic wave. Other optical elements will normally require static TPGs produced by degenerate driver pulses. Here we present the results of an experimental campaign conducted at the Central Laser Facility, where we have studied chirped pulse Raman amplification at high intensities. We have used a relatively long duration, frequency chirped, pump pulse to limit the growth of noise amplification, while ensuring amplification of the short seed pulse. We show that by changing the sign of the frequency chirp of the pump, the measured back-scattered and amplified seed energies change significantly. A negative chirp leads to a strong reduction in scattering from thermal density fluctuations, but seed amplification saturates. In contrast, for a positive frequency chirp, scattered energy continues to increase with increasing plasma density, without showing any sign of saturation, for the range of densities studied. From simulations we attribute this observation to the production of a local, long-lived, static TPG that continues to scatter the pump pulse long after it has passed. We will discuss the specific conditions that should be satisfied to produce such a grating. The ability to produce and maintain robust TPGs may provide a breakthrough in technologies for manipulating, reflecting and compressing ultra-intense laser pulses.

Proceedings Article | 18 April 2021 Presentation + Paper

Controlling the group velocity of an intense laser pulse using a pre-pulse

Samuel Yoffe, Bernhard Ersfeld, Devki Gupta, Arohi Jain, Matthew Tooley, George Holt, Dino Jaroszynski

Proceedings Volume 11778, 1177809 (2021) https://doi.org/10.1117/12.2595294

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Proceedings Article | 18 April 2021 Presentation

Radiation reaction of a charged sphere undergoing uniform acceleration and uniform circular motion

Teyoun Kang, Adam Noble, Samuel Yoffe, Dino Jaroszynski, Min Sup Hur

Proceedings Volume 11778, 117780G (2021) https://doi.org/10.1117/12.2589119

KEYWORDS: Particles, Optical spheres, Data modeling, Motion models, Electrodynamics

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Proceedings Article | 14 May 2019 Presentation

Raman amplification in plasma (Conference Presentation)

Samuel Yoffe, Gregory Vieux, Bernhard Ersfeld, Enrico Brunetti, Adam Noble, Remi Lehe, Jean-Luc Vay, Teyoun Kang, MinSup Hur, Dino Jaroszynski

Proceedings Volume 11036, 1103605 (2019) https://doi.org/10.1117/12.2522500

KEYWORDS: Raman spectroscopy, Plasma, Particles, Laser development, Laser systems engineering, Laser damage threshold, Solid state lasers, Solid state physics, Optical amplifiers, Backscatter

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There is significant international effort focussed on developing ultra-high-power systems for next-generation laser facilities, such as the Extreme Light Infrastructure (ELI). Existing amplification methods are based on chirped-pulse amplification (CPA). However, the low damage threshold of conventional solid-state optics results in very large amplifiers and compressors. To overcome this challenge, we use stimulated Raman backscattering of a long pump laser in plasma to provide amplification for a low intensity seed pulse. Plasma has the advantage that it is already a broken down medium and therefore field intensities are not constrained as they are in conventional laser amplifiers. This offers the potential to reduce the size and cost of these devices significantly, while providing a possible route to reach exawatt powers, which will enable investigation of extremely high field physics. Despite its advantages, efficient Raman amplification has not yet been demonstrated experimentally. Efficiencies are limited to only a few percent for seed energies of a few mJ, in contrast with theoretical predictions. Several phenomena lead to saturation or inhibit the amplification process – such as detuning, wavebreaking and particle trapping – depending on the amplification regime. Amplification is therefore highly sensitive to the conditions and parameters used. Raman amplification experiments are challenging, and careful planning is required to ensure that controlled and sustained amplification can take place. Numerical simulation is an essential ingredient to this preparation yet, like the experiments themselves, this is not a trivial task. The amplification process takes place over several millimetres, while structures on the short beat wavelength of the lasers need to be adequately resolved. Since particle kinetic effects are also important, a large number of particles are required. Simulation of the entire domain therefore requires significant computing resources, and therefore many investigations are only performed in 1-dimension. Moreover, the long propagation times involved allow numerical artefacts from processes such as grid heating or numerical dispersion to become significant. These can become pathological and artificially seed or disturb the amplification process. Using state-of-the-art numerical techniques, we investigate the amplification of low- and high-intensity seed pulses in plasma, and compare their amplification growth rates and efficiencies with experimental results obtained by our group. The use of a chirped pump laser pulses is discussed and compared.

Proceedings Article | 14 May 2019 Presentation

Chirped pulse Raman amplification in plasma (Conference Presentation)

Gregory Vieux, Silvia Cipiccia, Gregor Welsh, Sam Yoffe, Matthew Tooley, Craig Picken, Graeme McKendrick, Felix Gaertner, Enrico Brunetti, Bengt Eliasson, Bernhard Ersfeld, MinSup Hur, John Farmer, Joao Dias, Thomas Kuehl, Alexander Pukhov, Dino Jaroszynski

Proceedings Volume 11036, 1103604 (2019) https://doi.org/10.1117/12.2522976

KEYWORDS: Plasma, Raman spectroscopy, Laser applications, Laser amplifiers, Backscatter, Raman scattering, Scattering, Capillaries, Picosecond phenomena

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Proceedings Article | 24 April 2019 Paper

Generation of electron high energy beams with a ring-like structure by a dual stage laser wakefield accelerator

R. Spesyvtsev, E. Brunetti, G. Vieux, M. Shahzad, A. Maitrallain, S. Yoffe, B. Ersfeld, A. Kornaszewski, M. J. Streeter, O. Finlay, Y. Ma, B. Kettle, S. J. Dann, F. Albert, N. Bourgeois, S. Cipiccia, J. Cole, E. Gerstmayr, I. Gonzáles, A. Higginbotham, A. Hussein, K. Falk, K. Krushelnick, N. Lemos, N. Lopes, C. Lumsdon, O. Lundh, S. P. Mangles, Z. Najmudin, P. Rajeev, M. Smid, D. Symes, A. G. Thomas, D. Jaroszynski

Proceedings Volume 11036, 110360F (2019) https://doi.org/10.1117/12.2522781

KEYWORDS: Plasma, Electron beams, X-rays, Physics, Pulsed laser operation, CCD cameras, Laser beam propagation, Calibration

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Proceedings Article | 24 April 2019 Paper

Streaming instabilities in converging geometry

Lucas Inigo Gamiz, Bernhard Ersfeld, Samuel Yoffe, R. Alan Cairns, Dino Jaroszynski

Proceedings Volume 11036, 1103606 (2019) https://doi.org/10.1117/12.2524105

KEYWORDS: Plasma, Wave propagation, Electron beams

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Proceedings Article | 24 April 2019 Paper

Plasma density shaping for attosecond electron bunch generation

Andrzej Kornaszewski, Roman Spesyvtsev, Mohammed Shahzad, Enrico Brunetti, Przemysław Wachulak, Tomasz Fok, Łukasz Węgrzyński, Giorgio Battaglia, Bernard Ersfeld, James Feehan, Lucas Inigo Gamiz, Karolina Kokurewicz, Wentao Li, Antoine Maitrallain, Adam Noble, Lewis Reid, Matthew Tooley, Gregory Vieux, Samuel Wiggins, Sam Yoffe, Henryk Fiedorowicz, Dino Jaroszynski

Proceedings Volume 11036, 110360R (2019) https://doi.org/10.1117/12.2522780

KEYWORDS: Plasma, Extreme ultraviolet, Pulsed laser operation, 3D modeling, Computer simulations, Modulation

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Proceedings Article | 24 April 2019 Presentation + Paper

Controlled generation of ultra-short electron bunches using density modulation

Samuel Yoffe, Bernhard Ersfeld, Matthew Tooley, Adam Noble, Ross Fraser, Dino Jaroszynski

Proceedings Volume 11036, 110360O (2019) https://doi.org/10.1117/12.2522502

KEYWORDS: Plasma

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Proceedings Article | 3 January 2019 Paper

Optical pumped ultra-short pulse CO2 lasers as drivers of laser-plasma accelerators and other applications

D. Jaroszynski, R. Campbell, E. Brunetti, S. Yoffe

Proceedings Volume 11042, 110420W (2019) https://doi.org/10.1117/12.2522546

KEYWORDS: Gas lasers, Pulsed laser operation, Plasma, Carbon dioxide lasers, Laser applications, Optical pumping, Semiconductor lasers, Photons, Diode pumped solid state lasers

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Proceedings Article | 3 January 2019 Paper

Compact radiation sources based on laser-driven plasma waves

D. Jaroszynski, M. P. Amnania, C. Aniculaesei, G. Battaglia, E. Brunetti, S. Chen, S. Cipiccia, B. Ersfeld, D. Reboredo Gil, D. Grant, P. Grant, M. S. Hur, L. I. Inigo Gamiz, T. Kang, K. Kokurewicz, A. Kornaszewski , W. Li, A. Maitrallain , G. Manahan , A. Noble, L. Reid, M. Shahzad , R. Spesyvtsev , A. Subiel, M. Tooley, G. Vieux, S. Wiggins, G. Welsh, S. Yoffe , X. Yang

Proceedings Volume 11042, 110420Y (2019) https://doi.org/10.1117/12.2522929

KEYWORDS: Plasma, Electron beams, Extreme ultraviolet, Spectroscopy, Free electron lasers, Femtosecond phenomena, Photons, Pulsed laser operation, Terahertz radiation, Laser applications

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Proceedings Article | 13 June 2017 Presentation

Laser amplifier based on Raman amplification in plasma (Conference Presentation)

Gregory Vieux, Silvia Cipiccia, Nuno R. Lemos, Cristian Ciocarlan, Peter Grant, David Grant, Bernhard Ersfeld, MinSup Hur, Panagiotis Lepipas, Grace Manahan, David Reboredo Gil, Anna Subiel, Gregor Welsh, S. Mark Wiggins, Samuel Yoffe, John Farmer, Constantin Aniculaesei, Enrico Brunetti, Xue Yang, Robert Heathcote, Gagik Nersisyan, Ciaran L. Lewis, Alexander Pukhov, Joāo Mendanha Dias, Dino Jaroszynski

Proceedings Volume 10234, 1023407 (2017) https://doi.org/10.1117/12.2269511

KEYWORDS: Plasma, Raman spectroscopy, Laser applications, Amplifiers, Laser amplifiers, Backscatter, Solid state lasers, Solid state physics

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Proceedings Article | 15 May 2017 Paper

Observations on the ponderomotive force

D. Burton, R. Cairns, B. Ersfeld, A. Noble, S. Yoffe, D. Jaroszynski

Proceedings Volume 10234, 102340G (2017) https://doi.org/10.1117/12.2270542

KEYWORDS: Numerical analysis, Plasma, Electromagnetism, Physics, Quantum efficiency, Wave propagation, Mathematics, Plasma physics, Laser applications

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Proceedings Article | 15 May 2017 Presentation + Paper

Electron beam cooling in intense focussed laser pulses

Samuel Yoffe, Adam Noble, Alexander Macleod, Dino Jaroszynski

Proceedings Volume 10234, 102340E (2017) https://doi.org/10.1117/12.2265812

KEYWORDS: Electron beams, Stochastic processes, Laser applications, Radiation effects, High power lasers, Quantum physics, Gaussian beams

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Proceedings Article | 12 May 2015 Paper

Cooling of relativistic electron beams in chirped laser pulses

Samuel Yoffe, Adam Noble, Yevgen Kravets, Dino Jaroszynski

Proceedings Volume 9509, 950905 (2015) https://doi.org/10.1117/12.2182573

KEYWORDS: Electron beams, Particles, Electroluminescent displays, Pulsed laser operation, Atmospheric particles, Physics, High power lasers, Photons, Quantum physics, Laser energy

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Showing 5 of 17 publications

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