Journal
OPTICS EXPRESS
Volume 18, Issue 7, Pages 6853-6862Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.006853
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Funding
- STFC
- EPSRC [EP/C530764/1, EP/E028063/1, EP/C530756/2]
- Engineering and Physical Sciences Research Council [EP/C530764/1, EP/E028063/1, EP/C530756/1, EP/C530756/2] Funding Source: researchfish
- EPSRC [EP/E028063/1] Funding Source: UKRI
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We report observations and analysis of high harmonic generation driven by a superposition of fields at 1290 nm and 780 nm. These fields are not commensurate in frequency and the superposition leads to an increase in the yield of the mid-plateau harmonics of more than two orders of magnitude compared to using the 1290 nm field alone. Significant extension of the cut-off photon energy is seen even by adding only a small amount of the 780 nm field. These observations are explained by calculations performed in the strong field approximation. Most importantly we find that enhancement is found to arise as a consequence of both increased ionization in the sum-field and modification of the electron trajectories leading to an earlier return time. The enhanced yield even when using modest intensity fields of 5 x 10(13) Wcm(-2) is extended to the 80 eV range and is a promising route to provide a greater photon number for applications in XUV imaging and time-resolved experiments at a high repetition rate. (C) 2010 Optical Society of America
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