Surface damage growth mitigation on KDP/DKDP optics using single-crystal diamond micromachining
Surface damage growth mitigation on KDP/DKDP optics using single-crystal diamond micromachining
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DOI：
10.1117/12.523859
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发表时间：
2004-06
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影响因子：
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通讯作者：
L. Hrubesh;J. Adams;M. Feit;W. Sell;J. Stanley;E. Miller;S. L. Thompson;P. Whitman;R. Hackel
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文献类型：
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作者：
L. Hrubesh;J. Adams;M. Feit;W. Sell;J. Stanley;E. Miller;S. L. Thompson;P. Whitman;R. Hackel
通过使用高速钻头和单晶金刚石钻头进行现场微加工，可以消除激光引发的KDP/DKDP光学表面损伤，从而减轻后续激光射击的损伤增长。我们的测试表明，在526 nm， ~3.2 ns脉冲，~12 J/cm2的影响下，在AR涂层加倍器（KDP）晶体的两个表面上加工的韧窝是稳定的。其他测试也证实，在351 nm， ~ 3ns脉冲，~8 J/cm2下，在AR涂层三倍体（DKDP）晶体的两个表面上加工的韧窝是稳定的。我们已经成功地缓解了DKDP上直径为0.14 mm的激光引发的表面损伤，在351nm， 13j /cm2， ~ 11ns脉冲长度下进行了1000次射击，在351nm， 8j /cm2, 3ns下进行了10次射击。介绍了该方法的细节，包括对微加工过程中产生的热量的估计，以及实施该方法的计划，以处理用于峰值功率激光应用的预启动或从服务中回收的大型光学器件。
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.