[Analysis of the plasma radiation induced by laser ablating Al at low pressure]

The plasma was obtained with Nd:YAG laser ablating aluminum. The energy of a pulsed laser beam was set up to 145 mJ. Ar gas was used as protecting gas, its pressure was set up to 100 Pa. The information of the plasma radiation was acquired with time-resolved technique. The time-resolved spectra including continuum radiation, absorption of continuum radiation and Al atomic spectral lines radiation were obtained. The evolutions of all these radiations were analyzed, and the relationship between them was discussed briefly. We found that the evolutions of all these radiation at the low pressure were similar to that of at the pressure of one atmosphere.