摘要
We have studied the plasma generation through collecting the charged particles produced in laser-induced break-down in atmospheric air.This breakdovn is produced by ultrashort laser pulses with various durations ranging from 200fs to 2ps at a fixed pulse energy of 8mJ.We found that the plasma yield increases first with the increment of pulse duration and then reaches a plateau at a duration longer than 500fs.The generated plasma temperature is estimated to be higher than 5x 10^(5)K.
基金
the National Climbing Project of China,and the National Natural Science Foundation of China under Grant Nos.19884001 and 19525412.
