Scaling in damage of optical materials by intensive laser radiation

www.maldutis.org This is a short review of the main reasons of the laser induced damage space scaling, when damage is caused by the first laser shoot (1-on-1) and by the sequence of N laser pulses to one and the same place (N-on-1). It provides herein that the laser pulse shape is important to laser damage and scaling in some cases. The accumulation of material property changes and LID threshold for N-on-1 process strongly dependends on the front and the back pulse slopes: the material property remnant changes become less; and, eventually, accumulative damage disappears when the pulse slopes are increased. When damage scaling is defined by competition of the self-focusing and the SBS processes, the long front slope is favored to the SBS. The theoretical model explains damage from the first laser shot (1-on-1), damage from sequence of laser pulses (N-on-1 LID); also, accumulation and damage scaling. When photon energy is more then twice less material ionization (hυ<Ei/2), the volume damage of transparent dielectrics by laser radiation is the main point of interest here