Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Ultrashort Pulses and Strong Fields (joint session K/Q)
Q 26.4: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Dressed-state-enhanced harmonic generation at high intensities with a single driving field — •Oskar Ernst and Thomas Halfmann — TU Darmstadt, Institut für angewandte Physik, Darmstadt, Germany
We investigate 5th and 7th harmonic generation of ultrashort picosecond laser pulses in the vacuumultraviolet (VUV) regime, enhanced by laser-induced dressed states in xenon. The pump laser for harmonic generation simultaneously acts as a control field, preparing multiple dressed states with large Autler-Townes splittings in the terahertz range. We observe well-defined dressed states even at large intensities up to 30 TW/cm2, corresponding to an already small Keldysh parameter around 2. The presence of dressed states compensates the Stark shift, enabling resonantly enhanced frequency conversion by up to one order of magnitude across a broad spectral window of approximately 40 nm, tunable via laser wavelength and intensity. Our results demonstrate that significant resonance enhancements of VUV generation via dressed states are possible and relevant even without an additional control field.
Keywords: dressed states; VUV; resonance enhancement