PRODUCING METHOD FOR POLYVALENT ION

摘要

PURPOSE:To produce polyvalent ions with high efficiency by means of a low- power-output exciting laser device by radiating subsequent laser short-pulses on top of a solid target surface sequentially before the electron temperature of the plasma produced by the preceding laser short-pulse reduces excessively low. CONSTITUTION:The valence of the ion included in a plasma generated by the first laser short-pulse colliding with a solid target is not large. But the plasma is gradually heated by the laser short-pulses incoming successively at substantially zero time interval so that the electron temperature rises up to a very high level to such an extent that polyvalence ions are produced. Subsequent pulses arrives to heat the plas-ma in steps before the density and electron temperature of a plasma produced by the preceding pulses reduces excessively low, so that the production of polyvalence ions is nonlinearly increased. Thus, polyvalent ions can be produced with high efficiency and moreover the irradiation intensity of the excited pulse laser light can be reduced.