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[en] A two-color femtosecond pump beam (800 and 1200 nm) and a one-color femtosecond probe beam (267 nm) were focused into a hydrogen gas to generate high-order Raman sidebands in the spectral region of 172–343 nm. The efficiency of frequency conversion to neighboring Stokes/anti-Stokes emission was 18%. Simultaneously, vacuum-ultraviolet stimulated emission was observed at 154.2 nm with the assistance of four-wave Raman mixing. This observation was explained as a Lyman transition (B1Σu+ → X1Σg+) of the hydrogen.
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