Laser damage thresholds in fused silica structured light gratings

Alan M. Frank; Calvin H. Gillespie

doi:10.1117/12.240388

27 May 1996 Laser damage thresholds in fused silica structured light gratings

Alan M. Frank, Calvin H. Gillespie

Proceedings Volume 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995; (1996) https://doi.org/10.1117/12.240388
Event: Laser-Induced Damage in Optical Materials: 1995, 1995, Boulder, CO, United States

Abstract

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 a 2D structure were tested. Damage thresholds were measured in single-shot exposure using a 300 mj, 1 micrometers wavelength laser with a nominal 15 ns 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 12 j/cm².

Citation Download Citation

Alan M. Frank and Calvin H. Gillespie "Laser damage thresholds in fused silica structured light gratings", Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); https://doi.org/10.1117/12.240388

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