Abstract

Surface modification of fused silica windows caused by the ablation of surface-bound microparticles under short pulse laser irradiation is investigated and related to beam propagation effects. Particle material dispersal and subsequent surface pitting after multiple pulses of 351 nm, 9J/cm2 laser light were found to depend strongly on material type and particle size. Surface pitting was most significant for opaque materials (aluminum, steel, acetal homopolymer), yielding pits as deep as 600 nm for 30μm diameter particles. Transparent particles (PET polymer, glass) tended to disperse material more widely and caused less pitting (100nm) than the opaque materials. Paraxial light propagation analysis showed that phase objects created by ablated opaque materials resulted in higher peak intensification (3x) than those created by transparent materials (1.5x). The fragmentation of ablated material is discussed in terms of brittle or ductile failure at high strain rates, indicating reasonable agreement between experiment and theory. An approximation for the laser-induced plasma pressure and size of the dispersal pattern is derived, indicating an inverse correlation with material density.

Full Article  |  PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription