A novel approach to restrain the formation of the burr during nanosecond laser ablation
is reported in this paper. An assistant laser pulse, separated from the primary processing
laser pulse with the pulse duration of 21 ns by temporal pulse shaping method, is used
to control the formation of the melt deposit. The effect of the assistant pulse on the
morphologies of the melt pools is investigated with the aid of microscope. The results of
machining grooves on steel samples with the shaped pulses show a reduction of the burr
at the boundary of the ablation zone. The contribution indicates a potential method for
obtaining an efficient ablation as well as good processing quality in short pulse laser
microfabrication.
The I-V characteristics of K(Ta0.65Nb0.35)O3 thin films being prepared by PLD method on Si(100) were found to be Ohmic at low fields and space-charge-limited at higher fields, and this phenomena was correctly explained by SCLC theory.
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