NEW PROGRESS IN THE INVESTIGATION OF PULSED LASER-INDUCED FAILURE MECHANISM
激光破坏机理研究的一个新进展

This paper reveals a new kind of pulsed laser-induced failure mode,which wasexperimentally observed in thin target plate of brass and was named as reverse plugging effect (RPE)by the authors previously.In the test,a pulsed Nd:Glaiss laser beam is used withduration 0.3ms,total energy 30-40J, spot size 2-5mm and particuldrily with a spdtialshape of non-Gaussian type,Theoretical analyses are presented for this newly-observed phenomenon,The present investigation confirms that the laser-induced failurfe mode couldbe altered essentially by changing temporal and shapes of the laser beam when its average parameters such as wavelength,intensity, duration and spot size remain unchanged ,If it isthe case,how are the temporal and spatial structures of the laser beam selected properly to cause the target plate damaged in most favorable way?This question might be called an inverse problem raised in the study of laser-induced failure mechanism and seems worth further exploration.