Overview of recent KDP damage experiments and implications for NIF tripler performance

Michael J. Runkel; Richard T. Jennings; Jim J. DeYoreo; Walter D. Sell; David Milam; Natalia P. Zaitseva; L. Carmen; Wade H. Williams

doi:10.1117/12.354149

23 July 1999 Overview of recent KDP damage experiments and implications for NIF tripler performance

Michael J. Runkel, Richard T. Jennings, Jim J. DeYoreo, Walter D. Sell, David Milam, Natalia P. Zaitseva, L. Carmen, Wade H. Williams

Author Affiliations +

Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354149
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

Abstract

Considerable attention has been paid over the years to the problem of growing high purity KDP and KD*P to meet damage threshold requirements of inertial confinement fusion lasers at LLNL. The maximum fluence requirement for KD*P triplers on the NIF is 14.3 J/cm² at 351 nm in a 3 ns pulse. Currently KD*P cannot meet this requirement without laser (pre)conditioning. In this overview, recent experiments to understand laser conditioning and damage phenomena in KDP and KD*P are discussed. These experiments have led to a fundamental revision of damage test methods and test result interpretation. In particular, the concept of a damage threshold has given way to measuring performance by damage distributions using beams of millimeter size. Automated R/1 damage test have shown that the best rapidly grown KDP crystals exhibit the same damage distributions as the best conventionally grown KD*P. Continuous filtration of the growth solution and post-growth thermal annealing are shown to increase the damage performance as well.

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Michael J. Runkel, Richard T. Jennings, Jim J. DeYoreo, Walter D. Sell, David Milam, Natalia P. Zaitseva, L. Carmen, and Wade H. Williams "Overview of recent KDP damage experiments and implications for NIF tripler performance", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354149

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