Interfering Raman pathways (IMAGE)

Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI)

Interfering Raman pathways

Caption

Figure 1  Interfering Raman pathways.  a  Excitation scheme, which shows the  two interfering stimulated Raman pathways that  excite the metastable He(2s) from the ground  state through the continuum. The intense and short  XUV pulses used for the excitation are generated at the FERMI free-electron laser and are harmonics Hx of order x of the frequency of the seed laser. b Excitation yield of the metastable He(2s) as a function of the phase of the harmonic Hn=12, which shows the  sinusoidal behavior typical for interference. The two Raman pathways are realized by the pairs of harmonics (H8, H12) and (H4, H8).

Credit

Prof. Dr. U. Eichmann | MBI "Phase control of interfering stimulated Raman pathways in the XUV regime", U. Eichmann et al., Nature Photonics (2026), DOI: 10.1038/s41566-026-02024-9, licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/)

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