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The present measurements of the components' surface
resistance to laser-induced damage has been completed to facilitate
development and construction of the “Luch” laser
system, a four-channel Nd-phosphate glass laser with a full
output energy of E = 14–16 kJ. The study describes
a method that, with a series of experimental data obtained from
a single sample, allows us not only to estimate the threshold
fluences, but to take into account the statistical nature of
the surface damage. In a number of experimental situations this
method makes it possible to estimate damaging fluences even
from the result of a single exposure of the studied surface.
Estimated threshold fluences for various optical elements are
presented: K8 glass, experimental phosphate laser glass KGSS-0180,
high-reflecting and antireflecting thin-film coating of elements.
The 1.054-μm radiation pulse with half-height duration of
4 ns and the irradiation spot of ∼4 mm in diameter were
used in the experiment.
The investigations of the influence of various
types of wavefront distortions, varying in time, on the
intensity distribution on the surface of a target are carried
out. It is shown that distortions of a wavefront, equivalent
to transverse displacement in time of a beam in far field
at an angle of approximately 10 diffraction angles, results
in practically full smoothing of a specl-structure of intensity
distribution. Creation of phase distortions of a beam assigned
as running in a cross section wave with an amplitude of
more than 3 radian and with a spatial size exceeding 20–30
times the size of the kinoform phase plate element, permits
us to reduce the depth of modulation in distribution of
intensity in far field also. The capability of application
is considered as a smoothing device of the dynamic plasma
layer, based on the volume-structured medium. The model
of energy transport process in such media is developed.
Matching of calculation and experimental results is conducted.
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