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A process whereby laser-initiated surface damage on KDP/DKDP optics is removed by spot micro-machining using a high-speed drill and a single-crystal diamond bit, is shown to mitigate damage growth for subsequent laser shots. Our tests show that machined dimples on both surfaces of an AR coated doubler (KDP) crystal are stable, for 526 nm, ~3.2 ns pulses at ~12 J/cm2 fluences. Other tests also confirmed that the machined dimples on both surfaces of an AR coated tripler (DKDP) crystal are stable, for 351 nm, ~3 ns pulses at ~8 J/cm2. We have demonstrated successful mitigation of laser-initiated surface damage sites as large as 0.14 mm diameter on DKDP, for up to 1000 shots at 351 nm, 13 J/cm2, ~11 ns pulse length, and up to 10 shots at 351 nm, 8 J/cm2, 3 ns. Details of the method are presented, including estimates for the heat generated during micromachining and a plan to implement this method to treat pre-initiated or retrieved-from-service, large-scale optics for use in high-peak-power laser applications.

Surface damage growth mitigation on KDP/DKDP optics using single-crystal diamond micromachining