Absorption of ultrashort laser pulses in strongly overdense targets

作者：Cerchez M^*; Jung R; Osterholz J; Toncian T; Willi O; Mulser P; Ruhl H

来源：Physical Review Letters, 2008, 100(24): 245001.

DOI：10.1103/PhysRevLett.100.245001

Absorption measurements on solid conducting targets have been performed in s and p polarization with ultrashort, high-contrast Ti:sapphire laser pulses at intensities up to 5 x 10(16) W/cm(2) and pulse duration of 8 fs. The particular relevance of the reported absorption measurements lies in the fact that the extremely short laser pulse interacts with matter close to solid density during the entire pulse duration. A pronounced increase of absorption for p polarization at increasing angles is observed reaching 77% for an incidence angle of 80 degrees. Simulations performed using a 2D particle in cell code show a very good agreement with the experimental data for a plasma profile of L/lambda approximate to 0.01.

• 出版日期2008-6-20