SYMPOSIA PAPER Published: 01 January 1988

Multiphoton Absorption Near Surface Damage Thresholds of Ionic Crystals and Metals


By means of acoustic probe beam deflection we have measured the energy of acoustic pulses released during the interaction of intense laser pulses with solid surfaces. This technique is well suited to determine surface damage thresholds. We find that for a sufficiently high defect density at the surface the primary energy absorption is by multiphoton ionization, even within a certain energy interval above the damage threshold. The order of the multiphoton process corresponds to the bulk band gap of ionic materials or, for metals, to the work function. “Inert” surfaces with a low density of surface defects, like MgF2 and CaF2, on the other hand, show evidence for dielectric breakdown.

Author Information

Matthias, E
Petzoldt, S
Elg, AP
West, PJ
Reif, J
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Developed by Committee: F01
Pages: 217–226
DOI: 10.1520/STP24425S
ISBN-EB: 978-0-8031-5033-1
ISBN-13: 978-0-8031-4481-1