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Compression of X-ray Free Electron Laser Pulses to Attosecond Duration.

Sadler JD, Nathvani R, Oleśkiewicz P, Ceurvorst LA, Ratan N, Kasim MF, Trines RM, Bingham R, Norreys PA - Sci Rep (2015)

Bottom Line: State of the art X-ray Free Electron Laser facilities currently provide the brightest X-ray pulses available, typically with mJ energy and several hundred femtosecond duration.Here we present one- and two-dimensional Particle-in-Cell simulations, utilising the process of stimulated Raman amplification, showing that these pulses are compressed to a temporally coherent, sub-femtosecond pulse at 8% efficiency.Furthermore, evidence is presented that significant Landau damping and wave-breaking may be beneficial in distorting the rear of the interaction and further reducing the final pulse duration.

View Article: PubMed Central - PubMed

Affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU.

ABSTRACT
State of the art X-ray Free Electron Laser facilities currently provide the brightest X-ray pulses available, typically with mJ energy and several hundred femtosecond duration. Here we present one- and two-dimensional Particle-in-Cell simulations, utilising the process of stimulated Raman amplification, showing that these pulses are compressed to a temporally coherent, sub-femtosecond pulse at 8% efficiency. Pulses of this type may pave the way for routine time resolution of electrons in nm size potentials. Furthermore, evidence is presented that significant Landau damping and wave-breaking may be beneficial in distorting the rear of the interaction and further reducing the final pulse duration.

No MeSH data available.


Related in: MedlinePlus

A schematic of the simulated set-up.A pump pulse of wavelength greater than 1 nm is focussed to highest possible peak intensity (>1018 W/cm2) on a target around 1/10 of solid density. A 2 fs seed pulse at slightly longer wavelength counter-propagates with a sufficiently small angular offset, such that the pulses interact for tens of microns. Under the conditions described, material absorption is low, whereas the plasma wave interaction depletes around 10% of the pump energy, with a portion of this scattered into the seed pulse as shown in Table 1. The interaction further reduces the seed duration to 500 as or less. The optimal pump pulse length is twice the width of the target, with linear polarisation for both pulses.
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f1: A schematic of the simulated set-up.A pump pulse of wavelength greater than 1 nm is focussed to highest possible peak intensity (>1018 W/cm2) on a target around 1/10 of solid density. A 2 fs seed pulse at slightly longer wavelength counter-propagates with a sufficiently small angular offset, such that the pulses interact for tens of microns. Under the conditions described, material absorption is low, whereas the plasma wave interaction depletes around 10% of the pump energy, with a portion of this scattered into the seed pulse as shown in Table 1. The interaction further reduces the seed duration to 500 as or less. The optimal pump pulse length is twice the width of the target, with linear polarisation for both pulses.

Mentions: This paper reports the first comprehensive computational study of Raman compression for XFEL pulses. This is achieved via stimulated Raman backward scattering (RBS), a proposal explored in reference13. This laser plasma interaction, in an underdense plasma, transfers some of the energy of a typical XFEL pulse to a much shorter sub-femtosecond pulse, as illustrated in Fig. 1.


Compression of X-ray Free Electron Laser Pulses to Attosecond Duration.

Sadler JD, Nathvani R, Oleśkiewicz P, Ceurvorst LA, Ratan N, Kasim MF, Trines RM, Bingham R, Norreys PA - Sci Rep (2015)

A schematic of the simulated set-up.A pump pulse of wavelength greater than 1 nm is focussed to highest possible peak intensity (>1018 W/cm2) on a target around 1/10 of solid density. A 2 fs seed pulse at slightly longer wavelength counter-propagates with a sufficiently small angular offset, such that the pulses interact for tens of microns. Under the conditions described, material absorption is low, whereas the plasma wave interaction depletes around 10% of the pump energy, with a portion of this scattered into the seed pulse as shown in Table 1. The interaction further reduces the seed duration to 500 as or less. The optimal pump pulse length is twice the width of the target, with linear polarisation for both pulses.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645159&req=5

f1: A schematic of the simulated set-up.A pump pulse of wavelength greater than 1 nm is focussed to highest possible peak intensity (>1018 W/cm2) on a target around 1/10 of solid density. A 2 fs seed pulse at slightly longer wavelength counter-propagates with a sufficiently small angular offset, such that the pulses interact for tens of microns. Under the conditions described, material absorption is low, whereas the plasma wave interaction depletes around 10% of the pump energy, with a portion of this scattered into the seed pulse as shown in Table 1. The interaction further reduces the seed duration to 500 as or less. The optimal pump pulse length is twice the width of the target, with linear polarisation for both pulses.
Mentions: This paper reports the first comprehensive computational study of Raman compression for XFEL pulses. This is achieved via stimulated Raman backward scattering (RBS), a proposal explored in reference13. This laser plasma interaction, in an underdense plasma, transfers some of the energy of a typical XFEL pulse to a much shorter sub-femtosecond pulse, as illustrated in Fig. 1.

Bottom Line: State of the art X-ray Free Electron Laser facilities currently provide the brightest X-ray pulses available, typically with mJ energy and several hundred femtosecond duration.Here we present one- and two-dimensional Particle-in-Cell simulations, utilising the process of stimulated Raman amplification, showing that these pulses are compressed to a temporally coherent, sub-femtosecond pulse at 8% efficiency.Furthermore, evidence is presented that significant Landau damping and wave-breaking may be beneficial in distorting the rear of the interaction and further reducing the final pulse duration.

View Article: PubMed Central - PubMed

Affiliation: Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU.

ABSTRACT
State of the art X-ray Free Electron Laser facilities currently provide the brightest X-ray pulses available, typically with mJ energy and several hundred femtosecond duration. Here we present one- and two-dimensional Particle-in-Cell simulations, utilising the process of stimulated Raman amplification, showing that these pulses are compressed to a temporally coherent, sub-femtosecond pulse at 8% efficiency. Pulses of this type may pave the way for routine time resolution of electrons in nm size potentials. Furthermore, evidence is presented that significant Landau damping and wave-breaking may be beneficial in distorting the rear of the interaction and further reducing the final pulse duration.

No MeSH data available.


Related in: MedlinePlus