Abstract
The results of calculations of the transmission of a laser pulse (of length 0.4-1.0 ns) through a hole of diameter 100-500 \ensuremath{\mu}m based on a one-dimensional hydrodynamics code are compared with experimental data. The model is based on plasma implosion inside a cylindrical cavity. The hydrodynamic calculations show that the transmission coefficient depends strongly on the diameter of the laser beam as well as of the hole and also on the pulse length. A weak dependence of the transmission coefficient on the laser light intensity is found. The theory agrees well with the results of experiments. \textcopyright{} 1996 The American Physical Society.
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