Contribution to a conference proceedings

PUBDB-2025-00734

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Advanced pulse shaping for photoinjector lasers

Ilia, D. (Corresponding author)DESY* ; Li, C.Extern* ; Große-Wortmann, U.DESY* ; Hartl, I.DESY* ; Jiang, Y.CFEL*DESY* ; Mahnke, C.DESY* ; Panuganti, H.DESY* ; Pressacco, F.XFEL.EU*DESY* ; Tavakol, H.DESY* ; Tuennermann, H.DESY*

2025

Abstract: FEL performance critically depends on electron beam emittance, a fundamental beam quality parameter, which is strongly dependent on the spatiotemporal characteristics of the photoinjector drive laser pulse.Here, we present our recent results on temporal pulse shaping capabilities of the NExt generation PhotocAthode Laser (NEPAL), the systems driving the photoinjectors of EuXFEL and and FLASH FEL facilities. In particular, we demonstrate generation of 25 ps flat-top deep-UV pulses, which have been shown to improve emittance, in comparison to a regular gaussian profile.Temporal pulse shaping is enabled by a spatial light modulator, allowing for high-resolution spectral attenuation and phase control. However, nonlinear processes in the system inevitably distort the pulse shape and therefore empirical optimization is required to achieve a desired shape.

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Contributing Institute(s):

1. Laser Forschung und Entwicklung (FS-LA)

Research Program(s):

1. 6G13 - Accelerator of European XFEL (POF4-6G13) (POF4-6G13)
2. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
3. 05D23GU3 - Verbundprojekt 05D2022 - OPAL-FEL: Optimierte Laserpulse für Freie-Elektronen-Laser. Teilprojekt 2. (BMBF-05D23GU3) (BMBF-05D23GU3)

Experiment(s):

1. Facility (machine) XFEL

Appears in the scientific report 2025

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