We present a technology of ultrafast imagingusing femtosecond laser as probe light and ICCDcamera as imaging instrument. And we obtained timeresolvedICCD images of a single nanosecond laserpulse (30ns laser pulse with a wavelength of 1064nm)ablation of silicon surface taking advantage of thistechnology. This research shows that when a singlenanosecond laser pulse was focused onto the silicontarget, it induced plasma firstly. The produced plasmawas very much and its propagation was very fast atfirst. And when the nanosecond laser pulse passed, theamount and propagation of the plasma didn't increaseany more until it disappeared.
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