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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.

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