Laser damage thresholds in fused silica structured light gratings
- Lawrence Livermore National Lab., CA (United States)
Computer-generated, ion-milled, holographic structures and gratings are being used for multiple splitting of high-power pulsed laser beams. The structures were manufactured by Teledyne Brown Engineering in Huntsville, Alabama, and both a linear grating and two dimensional structure were tested. Damage thresholds were measured in single-shot exposure using a 300mJ, 1{mu}m wavelength laser with a nominal 15ns gaussian pulse. Energy densities on the gratings were adjusted with a focusing lens and the energy distribution was mapped with an imaging profiler. The gratings were examined dynamically for sparking and breakdown. They were examined after exposure using phase contrast microscopy. Initial results indicate the grating surface is always damaged before the smooth surface independent of the beam direction. The initial indication is that the average energy density threshold for single-shot damage is in the excess of 12j/cm{sup 2}.
- Research Organization:
- International Society for Optical Engineering, Washington, DC (United States)
- OSTI ID:
- 552055
- Report Number(s):
- CONF-9510106-Vol.2714; TRN: 97:005737-0032
- Resource Relation:
- Conference: 27. annual symposium on optical materials for high power lasers, Boulder, CO (United States), 30 Oct - 1 Nov 1995; Other Information: PBD: [1996]; Related Information: Is Part Of Laser-induced damage in optical materials: 1995. Twenty-seventh annual Boulder damage symposium, proceedings; Bennett, H.E.; Guenther, A.H.; Kozlowski, M.R.; Newnam, B.E.; Soileau, M.J. [eds.]; PB: 794 p.
- Country of Publication:
- United States
- Language:
- English
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