Spectral broadening for multi-Joule pulse compression in the APOLLON Long Focal Area facility

Bleotu, P.; Wheeler, Jonathan; Papadopoulos, Dimitris N.; Chabanis, M.; Prudent, J; Frotin, M.; Martin, Luc; Lebas, N.; Fréneaux, Antoine; Beluze, A.; Mathieu, François; Audebert, P.; Ursescu, D.; Fuchs, Julien; Mourou, G.

doi:10.1017/hpl.2021.61

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…Two methods can be used for compression of the probe pulses: spectrum broadening achieved either in a gas-filled hollow fiber [25,26] or in a solid nonlinear medium (e.g. thin glass, crystal or plastic plates [27][28][29][30] ) proposed originally as Thin Film Compression by Prof. G. Mourou [31] in 2014. The method implementing a solid nonlinear medium for SPM after the main laser compressor is called Compression after Compressor Approach (CafCA) [32][33][34] .…”

Section: Introductionmentioning

confidence: 99%

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

Lorenz,

Grittani,

Kondo

et al. 2024

High Pow Laser Sci Eng

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Ultrafast optical probing is a widely used method of underdense plasma diagnostic. In relativistic plasma, the motion blur limits spatial resolution in the direction of motion. For many high-power lasers the initial pulse duration of 30-50 fs results in a 10-15 µm motion blur, which can be reduced by probe pulse post-compression. Here we used the Compression after Compressor Approach (CafCA) [Phys.-Usp. 62, 1096; JINST 17 P07035 (2022)], where spectral broadening is performed in thin optical plates and is followed by reflections from negative-dispersion mirrors. Our initially low-intensity probe beam was down-collimated for a more efficient spectral broadening and higher probeto-self-emission intensity ratio. The setup is compact, fits in vacuum chamber, and can be implemented within a short experimental time slot. We proved that the compressed pulse kept high quality necessary for plasma probing.

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Section: Introductionmentioning

confidence: 99%

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

Lorenz,

Grittani,

Kondo

et al. 2024

High Pow Laser Sci Eng

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“…The TFC method was successfully demonstrated in high-power laser systems. However, technological challenges currently limit the dimensions of the chirped mirrors used in TFC to sizes that can accommodate pulses in the near-PW range 31 , while the most practical implementations are at the 100 TW peak power level [32][33][34][35][36] . Reliability of the pulse duration and focal spot distortions are additional concerns for performing experiments.…”

Section: Introductionmentioning

confidence: 99%

Few-cycle, 100-TW-class laser pulses as efficient sources of nanocoulomb electron bunches and Bremsstrahlung

Horný,

Bleotu,

Ursescu

et al. 2024

Preprint

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The state-of-the-art ultrashort, few-cycle laser pulses recently have entered the regime of the 100 TW-class power and at 10 Hz repetition rate. We explore the potential of such pulses for efficient electron acceleration. The numerical modelling predicts that hundreds-MeV, nC-class electron bunches can be generated, transferring up to 58% of the laser pulse energy into electrons above 15 MeV. Furthermore, we exploit such electron bunches for the generation of a secondary source of hard X-ray Bremsstrahlung in a high-Z converter. The results suggest that up to 30% of the laser energy can be transformed into hard X-rays with energy above 10 keV. Such an exceptionally high conversion efficiency is achieved through increased laser-to-electron conversion due to the short duration of the laser pulse and the high energy of the accelerated electrons, where radiation losses in the converter significantly outweigh collisional losses. This Bremsstrahlung emitter could function as a generator of tertiary particles, including neutrons released through photonuclear reactions.

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“…Thus, the compression technique has been studied at the TW-scale at several of these laser systems, including CETAL, ALLS, PEARL, ELI-NP and CoReLS [13][14][15][16][17][18][19] , demonstrating up to fivefold pulse compression [20] , and even six-fold [21] . The technique was applied in producing betatron radiation from laser wakefield acceleration (LWFA) [22] , and the method is now being implemented on PW-scale laser systems [23,24] . A successful demonstration of the TFC on a laser system with an initial duration greater than 100 fs has great potential as an economical upgrade to existing picosecond-scale, high-energy laser systems, such as PETAL, OMEGA-EP and Vulcan.…”

Section: Introductionmentioning

confidence: 99%

Post-compression of high-energy, sub-picosecond laser pulses

Bleotu

Wheeler²,

Mironov³

et al. 2023

High Pow Laser Sci Eng

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The post-compression technique based on self-phase modulation of high-energy pulses leads to an increase in achievable peak power and intensity. Typically, the pulses considered in experiments have been less than 100 fs in duration. Here, the method is applied to the ELFIE laser system at the LULI facility, for a pulse of 7 J energy and an initial measured duration of 350 fs. A 5 mm thick Fused Silica window and a 2 mm COP polymer were used as optical nonlinear materials. The 9 cm diameter pulse was spectrally broadened to a bandwidth corresponding to 124 fs Fourier-limited pulse duration, then it was partly post-compressed to 200 fs. After measuring the spatial spectra of the beam fluence, a uniform gain factor of 4 increase in the fluctuations over the studied range of frequencies is observed, due to small-scale self-focusing.

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Spectral broadening for multi-Joule pulse compression in the APOLLON Long Focal Area facility

Cited by 9 publications

References 27 publications

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

In-vacuum post-compression of optical probe pulses for relativistic plasma diagnostics

Few-cycle, 100-TW-class laser pulses as efficient sources of nanocoulomb electron bunches and Bremsstrahlung

Post-compression of high-energy, sub-picosecond laser pulses

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