Impact of oblique reflections on the generation of isolated attosecond pulses by polarization gating

Isolated attosecond pulses are often generated via sub-optical-cycle polarization gating. This technique, based on the precise control of the time-dependent polarization of the infrared driver pulse, enables strong temporal confinement of the extreme ultraviolet (XUV) emission from high-order harmonic generation (HHG) in gases. In this work, we study the influence of pulse propagation between the position where the polarization gate is created and the nonlinear HHG medium on the generation of isolated attosecond pulses. Oblique reflections on mirrors, in particular, lead to a significant polarization-dependent carrier phase shift and group delay. In our experiments, seven reflections of the few-cycle infrared driver pulse on metallic mirrors at 45° lead to a delay of 2.8 fs, which is large enough to destroy the polarization gate. When these effects are precompensated, efficient XUV confinement via sub-cycle polarization gating is evidenced by continuous XUV spectra which strongly depend on the carrier-envelope phase (CEP).

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Publication Details

Journal
Optics Letters
Published
2025-08-28
DOI
https://doi.org/10.1364/ol.572691
Primary Topic
Laser-Matter Interactions and Applications
Type
article
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article

Impact of oblique reflections on the generation of isolated attosecond pulses by polarization gating

Dominik Hoff, Anne‐Lise Viotti, Ann-Kathrin Raab, Cord L. Arnold et al.
Optics Letters
Laser-Matter Interactions and Applications
article

Impact of oblique reflections on the generation of isolated attosecond pulses by polarization gating

Dominik Hoff, Anne‐Lise Viotti, Ann-Kathrin Raab, Cord L. Arnold, Nedjma Ouahioune, Praveen Kumar Maroju, E. Constant, Corentin Picot, Chen Guo, Liliana I. Perez, Mathieu Gisselbrecht, A. L’Huillier, Stefan Skupin, Daniel Diaz Rivas
article en

Abstract

Isolated attosecond pulses are often generated via sub-optical-cycle polarization gating. This technique, based on the precise control of the time-dependent polarization of the infrared driver pulse, enables strong temporal confinement of the extreme ultraviolet (XUV) emission from high-order harmonic generation (HHG) in gases. In this work, we study the influence of pulse propagation between the position where the polarization gate is created and the nonlinear HHG medium on the generation of isolated attosecond pulses. Oblique reflections on mirrors, in particular, lead to a significant polarization-dependent carrier phase shift and group delay. In our experiments, seven reflections of the few-cycle infrared driver pulse on metallic mirrors at 45° lead to a delay of 2.8 fs, which is large enough to destroy the polarization gate. When these effects are precompensated, efficient XUV confinement via sub-cycle polarization gating is evidenced by continuous XUV spectra which strongly depend on the carrier-envelope phase (CEP).

Optics LettersVol. 50(21)
Université Claude Bernard Lyon 1 (FR), Centre National de la Recherche Scientifique (FR), Lund University (SE), Centre de recherche en Epidémiologie et Santé des Populations (FR), Getinge (Sweden) (SE), Institut Lumière Matière (FR), Skåne University Hospital (SE)
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