26 February 2015 Optical damage performance measurements of multilayer dielectric gratings for high energy short pulse lasers
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Abstract
We investigate the laser damage resistance of multilayer dielectric (MLD) diffraction gratings used in the pulse compressors for high energy, high peak power laser systems such as the Advanced Radiographic Capability (ARC) Petawatt laser on the National Ignition Facility (NIF). Our study includes measurements of damage threshold and damage density (ρ(Φ)) with picosecond laser pulses at 1053 nm under relevant operational conditions. Initial results indicate that sparse defects present on the optic surface from the manufacturing processes are responsible for damage initiation at laser fluences below the damage threshold indicated by the standard R-on-1 test methods, as is the case for laser damage with nanosecond pulse durations. As such, this study supports the development of damage density measurements for more accurate predictions on the damage performance of large area optics.
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D. Alessi, D. Alessi, C. W. Carr, C. W. Carr, R. A. Negres, R. A. Negres, R. P. Hackel, R. P. Hackel, K. A. Stanion, K. A. Stanion, D. A. Cross, D. A. Cross, G. Guss, G. Guss, J. D. Nissen, J. D. Nissen, R. Luthi, R. Luthi, James E. Fair, James E. Fair, J. A. Britten, J. A. Britten, C. Haefner, C. Haefner, } "Optical damage performance measurements of multilayer dielectric gratings for high energy short pulse lasers", Proc. SPIE 9345, High Power Lasers for Fusion Research III, 934509 (26 February 2015); doi: 10.1117/12.2084823; https://doi.org/10.1117/12.2084823
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