Mr. Roushdey Salh Profile

Roushdey Salh

at Umeå Univ

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Proceedings Article | 5 July 2023 Presentation

Optical parametric synthesis of relativistic intensity sub-4.5 fs waveforms

Laszlo Veisz, Peter Fischer, Aitor De Andres, Alexander Muschet, Fritz Schnur, Kárpát Ferencz, Roushdey Salh

Proceedings Volume PC12577, PC1257703 (2023) https://doi.org/10.1117/12.2669771

KEYWORDS: X-rays, Laser applications, Pulsed laser operation, Plasma physics

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Ultrahigh intensity laser – plasma physics is normally driven by lasers with few-10 fs or longer pulse duration. Certain applications involving the generation of isolated attosecond electron and x-ray pulses, however, require much shorter pulses that is not available from lasers. We report on the optical parametric synthesis of quasi-single cycle waveforms which can reach ultra-relativistic intensities up to 10^21 W/cm^2. A pulse duration below 4.5 fs is achieved by amplifying the spectrum between 580 – 1020 nm in two separate spectral regions in two consecutive optical parametric chirped pulse amplifiers. One stage pumped by 355 nm is optimized below 700 nm, while another pumped by 532 nm is optimized above 700 nm. This combination of amplifiers is called optical parametric synthesizer (OPS), which serially synthesizes the spectrum (full spectrum propagates through all amplifiers). Three such OPS double stages provide 440-500 mJ energy in the short light pulse corresponding to 100 TW peak power. Typical applications will be shortly introduced, such as electron acceleration from relativistic laser-plasmas and nonlinear attosecond x-ray interaction.

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