15 January 2007 Results of sub-nanosecond laser-conditioning of KD2PO4 crystals
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Previous work [1] has shown the optimum pulse length range for laser-conditioning tripler-cut DKDP with 355 nm (3ω) light lies between 200 ps and 900 ps for damage initiated at 3 ns. A 3ω, 500 ps (500 ps) table-top laser system has been built at Lawrence Livermore National Laboratory (LLNL) [2] to take advantage of this optimal conditioning pulse length range. This study evaluates parameters important for practically utilizing this laser as a raster-scan conditioning laser and for determining the effectiveness of various conditioning protocols. Damage density vs. test fluence (ρ(Φ) was measured for unconditioned and 500-ps laser-conditioned (conditioned) DKDP with 3ω, 3 ns (3 ns) test pulses. We find a 2.5X improvement in fluence in the 3 ns ρ(Φ) after conditioning with 500 ps pulses to 5 J/cm2. We further determine that the rate of improvement in ρ(Φ)decreases at the higher conditioning fluences (i.e. 3.5 - 5 J/cm2). Single-shot damage threshold experiments at 500 ps were used to determine the starting fluence for our 500 ps conditioning ramps. We find 0%, 70%, and 100% single-shot damage probability fluences of 4, 4.5, and 5 J/cm2, respectively at 500 ps. Bulk damage size distributions created at 3 ns are presented for unconditioned and conditioned DKDP. The range of diameters of bulk damage sites (pinpoints) in unconditioned DKDP is found to be 4.6 ± 4.4 µm in agreement with previous results. Also, we observe no apparent difference in the bulk damage size distributions between unconditioned and conditioned DKDP for testing at 3 ns.
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J. J. Adams, J. J. Adams, J. A. Jarboe, J. A. Jarboe, C. W. Carr, C. W. Carr, M. D. Feit, M. D. Feit, R. P. Hackel, R. P. Hackel, J. M. Halpin, J. M. Halpin, J. Honig, J. Honig, L. A. Lane, L. A. Lane, R. L. Luthi, R. L. Luthi, J. E. Peterson, J. E. Peterson, D. L. Ravizza, D. L. Ravizza, F. L. Ravizza, F. L. Ravizza, A. M. Rubenchik, A. M. Rubenchik, W. D. Sell, W. D. Sell, J. L. Vickers, J. L. Vickers, T. L. Weiland, T. L. Weiland, T. J. Wennberg, T. J. Wennberg, D. A. Willard, D. A. Willard, M. F. Yeoman, M. F. Yeoman, } "Results of sub-nanosecond laser-conditioning of KD2PO4 crystals", Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 64031M (15 January 2007); doi: 10.1117/12.696086; https://doi.org/10.1117/12.696086

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