Temperature diagnostic of germanium laser-produced plasmas using absorption spectroscopy of 2p-3d transition arrays

摘要

L-shell absorption spectroscopy of germanium has been exploited to diagnose the low-temperature, high-density region of multilayered targets irradiated by 0.35 μm laser light at irradiances around 10~(14) W/cm~2. A statistical simulation of unresolved transition arrays from GeVII to GeXX has been used to relate the observed absorption wavelengths to the electron plasma parameters. Results show time-dependent temperature variations following closely the driving laser pulse shape in agreement with hydrocode simulations.