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Color center formation in KCl and KBr single crystals with femtosecond laser pulses

机译:飞秒激光脉冲在KCl和KBr单晶中形成色心

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摘要

Because of their extremely high instantaneous powers, femtosecond lasers can color many nominally transparent materials. Although the excitations responsible for this defect formation occur on subpicosecond time scales, subsequent interactions between the resulting electronic and lattice defects complicate the evolution of color center formation and decay. These interactions must be understood in order to account for the long-term behavior of coloration. In this work, we probe the evolution of color centers generated by femtosecond laser radiation in potassium chloride and potassium bromide single crystals on time scales from microseconds to hundreds of seconds. By using an appropriately chosen probe laser focused through the femtosecond laser spot, we follow the changes in coloration due to individual or multiple femtosecond pulses and the evolution of that coloration for long times after femtosecond laser radiation is terminated.
机译:飞秒激光由于其极高的瞬时功率,可以使许多标称透明的材料着色。尽管造成这种缺陷形成的激发发生在皮秒级的时间尺度上,但是随后产生的电子缺陷和晶格缺陷之间的相互作用使色心形成和衰减的演化变得复杂。必须了解这些相互作用,以说明着色的长期行为。在这项工作中,我们研究了飞秒激光辐射在氯化钾和溴化钾单晶中从微秒到几百秒的时间范围内产生的色心的演变。通过使用经过飞秒激光点聚焦的适当选择的探测激光器,我们可以跟踪由于单个或多个飞秒脉冲而引起的颜色变化以及飞秒激光辐射终止后长时间的颜色演变。

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