Abstract
We have successfully demonstrated intensity enhancement of a single high-order harmonic at a wavelength of by using low-ionized tin ions in a laser-ablation plume as the nonlinear medium. The ablation plume was produced by irradiating a solid tin target with a energy picosecond laser pulse. Strong 17th-harmonic generation at a wavelength of was observed with a conversion efficiency of about . We attribute the strong enhancement of the single high-order harmonic to multiphoton resonance with a strong radiative transition of the ion.
© 2006 Optical Society of America
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