研究目的

To investigate the role of physical characteristics of the bulk target on THG in various plasmas by introducing the variable delay between the heating and the probe pulses and to use THG as a probe to identify the components of plasma from various bulk targets.

研究成果

THG in various plasma targets was studied using nanosecond and picosecond heating pulses in both vacuum and air. TH from various plasmas was used as a probe to characterize the components of the plasma. TH intensity shows the cubic dependence on the probe pulse energy in both air and vacuum. The modulation of TH intensity with the variation of delay between the heating and probe pulses is attributed to the influence of the masses of ejected particles in accordance with the relation td ∞ M0.5. THG in metal plasmas is governed by the atomic or ionic species, contrary to the wide-bandgap semiconductor materials where TH was generated by the small-sized clusters and nanoparticles.

研究不足

The study is limited by the specific materials used (C, Cr, In, Ni, Ag, CdS, and ZnS) and the conditions under which the experiments were conducted (vacuum and air). The influence of free electrons on TH yield at higher probe pulse energies is also a limitation.