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Investigation of damage mechanisms of KTiOPO_(4) crystals by use of a continuous-wave argon laser

机译：连续波氩激光研究KTiOPO_（4）晶体的损伤机理

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We have developed a simple method that uses cw irradiation from an argon laser to measure the damage threshold of KTP crystals. Our experimental results show that there are two types of damage in KTP crystal, depending on the polarization of the incident laser beam. One type of optical damage is the appearance of gray tracks, including both dark tracks and orange dots, when the pump polarization is perpendicular to the z axis. The other type is invisible damage when the polarization is parallel to the z axis. In addition, we have also observed weak photorefractive two-wave mixing in KTP crystals in each of these polarization states. After a systematic analysis we have concluded that the first type of damage is due to the formation and absorption of Ti~(3+) and Fe~(3+) centers and the second is due to the drift of K' ions. The weak photorefractive effect is the result of screening of the electric field by the drifted K' ions.
机译：我们已经开发出一种简单的方法，该方法使用来自氩激光器的连续波辐射来测量KTP晶体的损伤阈值。我们的实验结果表明，取决于入射激光束的偏振，KTP晶体中有两种类型的损伤。一种光学损伤是当泵浦偏振垂直于z轴时出现灰色轨迹，包括深色轨迹和橙色点。当偏振平行于z轴时，另一种类型是看不见的损坏。此外，我们还观察到了在每种偏振态下KTP晶体中的弱光折射两波混合。经过系统的分析，我们得出结论，第一种损伤是由于Ti〜（3+）和Fe〜（3+）中心的形成和吸收，第二种是由于K'离子的漂移。弱的光折射效应是由漂移的K'离子屏蔽电场的结果。

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