Enhanced High-Harmonic Generation Using 25 fs Laser Pulses
Jianxin ZhouCenter for Ultrafast Optical Science, The University of Michigan, Ann Arbor, Michigan 48109-2099J. PeatrossCenter for Ultrafast Optical Science, The University of Michigan, Ann Arbor, Michigan 48109-2099Margaret M. MurnaneCenter for Ultrafast Optical Science, The University of Michigan, Ann Arbor, Michigan 48109-2099Henry C. KapteynOptical Sciences (United States)Ivan P. ChristovCenter for Ultrafast Optical Science, The University of Michigan, Ann Arbor, Michigan 48109-2099
1996en
ABI
Abstract
We present experimental and theoretical results on high-harmonic generation in noble gases using an 805 nm, 25 fs, titanium-doped sapphire laser. The harmonic energies observed are unexpectedly high when compared with experimental and theoretical results to date for longer excitation pulses. We observe that the efficiency of harmonic production is highest for shorter pulses. Furthermore, the wavelength of the harmonics can be tuned by adjusting the sign of the chirp of the excitation pulse, demonstrating a tunable, ultrashort-pulse, $<25\mathrm{fs}$ soft-x-ray source.
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