CW laser-induced generation of periodic ring structures on thin PbSe films

Laser processing of epitaxial PbSe films has been found to produce periodic concentric surface ring structures that extend over several laser spot radii from the exposed zone. The proposed theoretical interpretation of this effect in terms of defect - deformation interactions adequately describes the observed morphology, periodicity and complex (multimode) shape of the ring structures. (interaction of laser radiation with matter)