Abstract
It is well known that the shape of a laser pulse transmitted through the plasma
of an optical breakdown in a gas, for example in air (a laser spark) as well as in air
close to the surface of a target (easy optical breakdown) is substantially distorted. In
this case, the pulse amplitude is reduced, and its width is shortened. It is of interest
to explain the possibility of initiating such a deformed breakdown pulse at the surface
of a second target. The conditions are found under which breakdown can be initiated at
the surfaces of two transparent insulating plates. Experimental results are obtained for
the actions of the pulses of a CO<sub>2</sub> laser on plates fabricated from NaCl. It
is shown that, under the conditions of the experiments carried out here, the probability
of simultaneously initiating a plasma at the surfaces of both plates is about 0.04. The
possibility of increasing it to about 0.6 is pointed out.
© 2008 Optical Society of America
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