Abstract
The damage caused by Q-switched laser pulses and picosecond pulses in specimens of polymethyl methacrylate and polystyrene is described. The damage criterion depends on both characteristics of the laser pulse, i.e., energy and intensity. Nonlinear absorption effects are not observed when the energy threshold is crossed. It is shown that Q-switched and free-running laser pulses react with polymer specimens in essentially the same way. The induction period and rate of crack development have been established. The emission excited in the specimen by the laser pulse is investigated.
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