SYMPOSIA PAPER Published: 01 January 1988
STP18780S

Thresholds Measured With 350-nm Pulses at 25–100 Hz for Bare Polished Crystals of CaF and for Silica Sol-gel AR Coatings on Silica Substrates

Source

An XeF laser-damage experiment was used to measure damage thresholds for bare polished crystals of CaF2 and porous silica antireflection coatings on fused silica substrates. Damage was induced by applying 1000 350-nm, 25-ns pulses at repetition rates of 25–100 Hz to small (typically 0.12 × .03 cm) sites on the surfaces of the sample. Eight samples of fluorescence-free CaF2 exhibited both surface and bulk damage at fluences as low as 10 J/cm2. Three samples of UV-grade CaF2 also had surface damage thresholds of 10 J/cm2, and bulk damage was not observed in this material. Thresholds for the porous silica coatings were 17–23 J/cm2.

Author Information

Staggs, MC
Milam, D
Thomas, IM
Wilder, JG
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Details
Developed by Committee: F01
Pages: 404–411
DOI: 10.1520/STP18780S
ISBN-EB: 978-0-8031-5031-7
ISBN-13: 978-0-8031-4479-8