Detection and characterization of absorption heterogeneities in KH2PO4 crystals
Detection and characterization of absorption heterogeneities in KH2PO4 crystals
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DOI：
10.1016/j.optcom.2006.06.043
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发表时间：
2006-11
影响因子：
2.4
通讯作者：
M. Pommies;D. Damiani;B. Bertussi;J. Capoulade;H. Piombini;J. Natoli;H. Mathis
中科院分区：
文献类型：
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作者：
M. Pommies;D. Damiani;B. Bertussi;J. Capoulade;H. Piombini;J. Natoli;H. Mathis
SOCRATE 设备用于检测大型且快速生长的 KH2PO4(KDP) 晶体的异质吸收。随后通过分光光度法和激光损伤测量来表征不同区域。根据之前文献的结果，我们发现，通过使用大光束（300*600μm2）的 SOCRATE 损伤测量装置，吸收水平在 355nm 处的损伤机制中并不起主要作用。然而，通过在 355nm 处使用聚焦光束（直径 9μm）测试相同 KDP 组件的抗损伤性，我们首次强调了 KDP 晶体的高吸收区域和弱吸收区域之间的抗损伤性存在显着差异。事实上，通过聚焦光束，我们证明了在锥体部分切割的某些扇区中的激光损伤阈值可能低于棱柱形部分的扇区中的激光损伤阈值。这意味着高浓度的吸收缺陷不是 355nm 处的主要损伤前体。
The SOCRATE facility is used for the detection of heterogeneous absorption in large and rapidly grown KH2PO4(KDP) crystals. The different regions are subsequently characterized by spectrophotometry and laser-damage measurement. In accordance with previous results from the literature we found that, by using the SOCRATE damage measurement set-up with a large beam (300∗600μm2), the absorption level does not play a major role in the damage mechanism at 355nm. However, by testing the damage resistance of the same KDP component with a focused beam (9μm diameter) at 355nm, we highlight for the first time significantly different damage resistances between highly and weakly absorbing regions from a KDP crystal. Indeed, with a focused beam, we demonstrate that the laser-damage threshold may be lower in some sectors cut in the pyramidal part than in sectors from the prismatic part. This means that the absorbing defects at high concentration are not the predominant damage precursors at 355nm.