Enhancement of conversion efficiency and spatial coherence of high order harmonics generated from pre-formed plasma plumes using an apertured laser beam
Abstract:The effect of laser beam aperturing (Ti: sapphire laser; 800 nm, 45 fs) on the conversion efficiency (CE), harmonic yield and spatial coherence of high order harmonics generated from a low excited plasma plume of carbon (neutral and singly charged ions) is studied. The optimization of CE by varying the aperture size in combination with different laser and plasma plume parameters was carried out. The CE of the 15th harmonic is enhanced from ∼10−7 for an unapertured laser beam to ∼10−6 for ∼¼ times the unapertur… Show more
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