The generation of up to the 33rd harmonic (λ=24.12nm) of a Ti:sapphire laser pulse using prepulse-produced chromium plasma as a nonlinear medium was demonstrated. A steep decrease of intensity for low-order harmonics (up to the 15th order) was followed by a plateau. A considerable restriction of 27th harmonic generation was observed in different focusing conditions.
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Ganeev et al. (2005) studied this question.
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