Nanosecond-laser plasma-assisted ultradeep microdrilling of optically opaque and transparent solids
2007; American Institute of Physics; Volume: 101; Issue: 4 Linguagem: Inglês
10.1063/1.2434829
ISSN1520-8850
AutoresP. Stanley, S. I. Kudryashov, Kevin Lyon, Susan D. Allen,
Tópico(s)Laser-Plasma Interactions and Diagnostics
ResumoA mechanism of ultradeep (up to tens of microns per pulse, submillimeter total hole depths) plasma-assisted ablative drilling of optically opaque and transparent materials by high-power nanosecond lasers has been proposed and verified experimentally using optical transmission and contact photoacoustic techniques to measure average drilling rates per laser shot versus laser intensity at constant focusing conditions. The plots of average drilling rates versus laser intensity exhibit slopes which are in good agreement with those predicted by the proposed model and also with other experimental studies. The proposed ultradeep drilling mechanism consists of a number of stages, including ultradeep “nonthermal” energy delivery into bulk solids by the short-wavelength radiation of the hot ablative plasma, bulk heating and melting, accompanied by subsurface boiling in the melt pool, and resulting melt expulsion from the target.
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