An injection-locking excimer laser beam with a pulse duration of 25 ns is focused on the surface of a polymide film. The laser beam that passes through the etching film is shorter than the original one. By optimizing the thickness of the film and the beam powerdensity, a pulse with a 3-ns pulse duration can be obtained using this switch technology.
The characteristics of a laser plasma created by a high intensity UV excimer laser were investigated. The UV laser plasma was used as a switch for control of the laser pulse duration for the first time. An X-ray preionized XeCl laser pulse duration can be changed from 10 to 85 ns. This technique is useful for many applications of excimer lasers requiring various pulse durations.
In this article, we present a laboratory astrophysics experiment
on radiative shocks and its interpretation using simple modelization.
The experiment is performed with a 100-J laser (pulse duration of about
0.5 ns) which irradiates a 1-mm3 xenon gas-filled cell.
Descriptions of both the experiment and the associated diagnostics
are given. The apparition of a radiation precursor in the unshocked
material is evidenced from interferometry diagrams. A model
including self-similar solutions and numerical ones is derived
and fairly good agreements are obtained between the theoretical
and the experimental results.
Excimer laser plasma to control laser pulse duration