Multipass cell post-compression at 515 nm as an efficient driver for a table-top 13.5 nm source

• Published in: EPJ Web of conferences Vol. 287; p. 8008
• Main Authors: Karst, Maximilian, Pfaller, Pauline, Klas, Robert, Abdelaal, Mahmoud, Wang, Ziyao, Rothhardt, Jan, Limpert, Jens
• Format: Journal Article
• Language: English
• Published: EDP Sciences 2023
• ISSN: 2100-014X; 2100-014X
• DOI: 10.1051/epjconf/202328708008

We present a table-top, efficient and power scalable scheme enabling the effective generation of extreme ultraviolet radiation up to 100 eV photon energy. Therefor ultrashort pulses (< 20fs) in the visible spectral range (515 nm) are used to drive high harmonic generation (HHG) in helium. This allows for a significant efficiency boost compared to near-infrared (NIR) drivers, enabled by the favourable scaling of the single-atom response of λ
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[1]. The experimental realization of a mulitpass cell delivering 15.7 fs pulses with a peak power close to 25 GW at 515 nm and an overall efficiency (IR to compressed green pulse) of >40 %. In conjunction, preliminary HHG results will be presented, paving the way for mW-class HHG sources at 13.5 nm.