Abstract
We have successfully demonstrated the intensity enhancement of single high-order harmonic at a wavelength of 61.26 and 46.76 nm using low ionized indium and tin ions in laser ablation plume as the nonlinear medium. The ablation plume was produced by irradiating of solid tin target with 10 mJ energy picosecond laser pulse. Using the indium target, the 13th harmonic at the wavelength of 61.26 nm was obtained with conversion efficiency of 8x10-5. Using the tin target, the 17th harmonic at a wavelength of 46.76 nm was observed with conversion efficiency of about 10-4. We attribute the strong enhancement of single high-order harmonic to multiphoton resonance with a strong radiative transition of the In and Sn II ions.
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