Investigation of processes leading to damage growth in optical materials for large-aperture lasers

Stavros G. Demos, Mike Staggs, Mark R. Kozlowski

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Damage growth in optical materials used in large-aperture laser systems is an issue of great importance to determine component lifetime and therefore cost of operation. Small size damage sites tend to grow when exposed to subsequent high-power laser irradiation at 355 nm. An understanding of the photophysical processes associated with damage growth is important to devise mitigation techniques. We examine the role of laser-modified material and cracks formed in the crater of damage pits in the damage growth process using fused-silica and deuterated KDP samples. Experimental results indicate that both of the above-mentioned features can initiate plasma formation at fluences as low as 2 J/cm2. The intensity of the recorded plasma emission remains low for fluences up to approximately 5 J/cm2 but rapidly increases thereafter, accompanied by an increase of the size of the damage crater.

Original languageEnglish (US)
Pages (from-to)3628-3633
Number of pages6
JournalApplied Optics
Volume41
Issue number18
StatePublished - Jun 20 2002
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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