Abstract
To overcome limitations in the high harmonic conversion efficiency, the possibility of parametric amplification in the VUV and XUV is considered. Potential approaches, including parametric gain transfer from low- to high-order processes, are discussed. Experimentally, a near two photon resonant parametric gain scheme in xenon, excited by femtosecond KrF laser radiation at ωp=248 nm, was investigated, leading to signal (ωs) and idler (ωi) emissions at 149 nm and 760 nm according to 2ωp=ωs+ωi. For the signal field at 149 nm an exponential increase with density and length is obtained. By tuning the excimer laser radiation slightly towards the two-photon resonance, a macroscopic amplification of about 50 at 149 nm was measured. In addition, a sum-mixing signal at 106 nm according to ωsum=2ωp+ωi, showing a similar exponential increase as the 149-nm signal, is observed, which indicates a coupling of both processes with a gain transfer by the common idler field.
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Reinhardt, C., Rühl, A., Chichkov, B. et al. Parametric amplification and harmonic generation in the VUV and XUV. Appl Phys B 78, 841–844 (2004). https://doi.org/10.1007/s00340-004-1493-7
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DOI: https://doi.org/10.1007/s00340-004-1493-7