Surface high-harmonic generation on a relativistic plasma mirror for generating intense isolated attosecond field transients

Stefan Haessler; Jaismeen Kaur; Marie Ouillé; Zhao Cheng; Rodrigo Lopez-Martens

doi:10.1117/12.2665305

8 June 2023 Surface high-harmonic generation on a relativistic plasma mirror for generating intense isolated attosecond field transients

Stefan Haessler, Jaismeen Kaur, Marie Ouillé, Zhao Cheng, Rodrigo Lopez-Martens

Author Affiliations +

Proceedings Volume PC12582, Compact Radiation Sources from EUV to Gamma-rays: Development and Applications; PC125820M (2023) https://doi.org/10.1117/12.2665305
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

A plasma mirror is an over-dense plasma, created on the surface of a solid target ionized by a high-contrast femtosecond laser. It nonlinearly reflects an ultra-intense laser, resulting in surface high-harmonic generation (SHHG). At relativistic driving intensities, SHHG is a promising candidate for generating intense attosecond pulses, spanning the optical to the EUV spectral ranges. I will present our recent work on the development of such a source, driven by a waveform-controlled 1.5-cycle (< 4 fs, 780 nm) terawatt laser at 1-kHz repetition rate with extremely high temporal contrast. It allows fine control of the plasma density gradient, maximising the efficiency and spectral extent of relativistic SHHG. At optimal driving laser carrier-envelope-phase (CEP), the SHHG-emission is spectrally continuous and reaches beyond 30eV photon energy. This is the first demonstration of controlled and stable generation of such SHHG continua supporting powerful isolated attosecond pulses. Particle-in-cell simulations predict this emission to be compressed to a sub-femtosecond field transient even without any spectral filtering. We will discuss the experimental challenges related to re-focusing these to high intensity. Simultaneously and precisely synchronized with the light, MeV-kinetic-energy electron bunches are emitted through vacuum-laser acceleration. Their simultaneously measured spatio-spectral properties also carry clear CEP signatures.

Conference Presentation

Citation Download Citation

Stefan Haessler, Jaismeen Kaur, Marie Ouillé, Zhao Cheng, and Rodrigo Lopez-Martens "Surface high-harmonic generation on a relativistic plasma mirror for generating intense isolated attosecond field transients", Proc. SPIE PC12582, Compact Radiation Sources from EUV to Gamma-rays: Development and Applications, PC125820M (8 June 2023); https://doi.org/10.1117/12.2665305

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KEYWORDS

Plasma

Mirrors

High harmonic generation

Plasma generation

EUV optics

Extreme ultraviolet

Femtosecond phenomena

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