Thermal mechanisms of laser marking in transparent polymers with light-absorbing microparticles
Abstract
Interaction of highly viscous polystyrene suspensions of light-absorbing microparticles with pulsed radiation of a Q-switched YAG:Nd3+ laser is investigated. Absorption of laser radiation by the suspended microparticles causes thermal decomposition (pyrolysis) of the polymer in the vicinity of the overheated particles. Laser-induced incandescence (LII) of light-absorbing microparticles under irradiation by a sequence of laser pulses is observed. The mechanism of laser marking includes formation of light-absorbing and scattering centers by accumulation of carbonaceous and gaseous products of pyrolysis.
- Publication:
-
Optics Laser Technology
- Pub Date:
- January 2016
- DOI:
- 10.1016/j.optlastec.2015.07.011
- Bibcode:
- 2016OptLT..76...96Z
- Keywords:
-
- Laser marking;
- Pyrolysis;
- Polymers;
- Carbon-based light-absorbing microparticles;
- Laser-induced incandescence