Extrapolation of damage test data to predict performance of large-area NIF optics at 355 nm
For the aggressive fluence requirements of the NIF laser, some level of laser-induced damage to the large (40 x 40 cm) 351 nm final optics is inevitable. Planning and utilization of NIF therefore requires reliable prediction of the functional degradation of the final optics. Laser damage tests are typically carried out with Gaussian beams on relatively small test areas. The tests yield a damage probability vs energy fluence relation. These damage probabilities are shown to depend on both the beam fluence distribution and the size of area tested. Thus, some analysis is necessary in order to use these test results to determine expected damage levels for large aperture optics. The authors present a statistical approach which interprets the damage probability in terms of an underlying intrinsic surface density of damaging defects. This allows extrapolation of test results to different sized areas and different beam shapes (NIF has a flattop beam). The defect density is found to vary as a power of the fluence (Weibull distribution).
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Defense Programs (DP) (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 8358
- Report Number(s):
- UCRL-JC-131222; DP0212000; DP0212000; TRN: US0101979
- Resource Relation:
- Conference: 30th Boulder Damage Symposium: Symposium on Optical Materials for High Power Lasers, Boulder, CO (US), 09/28/1998--10/01/1998; Other Information: PBD: 22 Dec 1998
- Country of Publication:
- United States
- Language:
- English
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