SYMPOSIA PAPER Published: 01 January 1985

Damage Thresholds of Fused Silica, Plastics and KDP Crystals Measured with 0.6-ns 355-nm Pulses


We used 355-nm, 0.6-ns pulses focused to a beam diameter of approximately 1 mm to measure the laser damage thresholds for surfaces of bare polished samples of several types of fused silica, for the bulk of crystals of potassium dihydrogen phosphate (KDP), and for a few plastics. Surface damage thresholds for fused silica ranged from 1–14 J/cm2, and were least for surfaces with residual subsurface polishing fractures. Thresholds for inclusion damage in KDP crystals were 2–4 J/cm2. Test volumes in these same crystals had thresholds from 2.5–7.0 J/cm2 when they were laser hardened by repeated subthreshold irradiation. FEP teflon films had thresholds of 3 J/cm2, which were the greatest threshold observed for a plastic.

Author Information

Staggs, MC
Rainer, F
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Developed by Committee: F01
Pages: 84–90
DOI: 10.1520/STP28960S
ISBN-EB: 978-0-8031-4956-4
ISBN-13: 978-0-8031-0930-8