Absorption of ultrashort laser pulses in strongly overdense targets |
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Authors: | Cerchez M Jung R Osterholz J Toncian T Willi O Mulser P Ruhl H |
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Affiliation: | Heinrich-Heine Universit?t Düsseldorf, Universit?tsstr.1, 40225 Düsseldorf, Germany. mirela.cerchez@uni-duesseldorf.de |
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Abstract: | 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 5x10{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 approximately 0.01. |
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