Maximizing the yield and cutoff of high-order harmonic generation from plasma plume

摘要

We study high-order harmonic generation (HHG) from various lowly ionized laser plasmas. We study harmonic generation from targets of Al (Z = 13) to Bi (Z = 83). Varying the wavelength, chirp, and pulse duration of the ferntosecond pump laser resulted in the change in the harmonic distribution, cutoff, and conversion efficiency of HHG. We also study the use of doubly charged ions, and resonances for some materials. We were able to obtain high HHG conversion efficiency and harmonic cutoff by implementing the above approaches and by observing the time-resolved spectra of the laser plasma. (c) 2007 Optical Society of America