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首页> 外文会议>Conference on Photon Processing in Microelectronics and Photonics III; 20040126-20040129; San Jose,CA; US >Formation of high densities of color centers in insulator materials using ultrafast lasers
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Formation of high densities of color centers in insulator materials using ultrafast lasers

机译：使用超快激光在绝缘体材料中形成高密度的色心

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摘要

The high instantaneous powers associated with 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 produced by femtosecond laser radiation in soda lime glass and single crystal sodium chloride on time scales from microseconds to hundreds of seconds. By using an appropriately chosen probe laser focused through the femtosecond laser spot, we can follow the changes in coloration due to individual or multiple femtosecond pulses, and follow the evolution of that coloration for long times after femtosecond laser radiation is terminated. For the soda lime glass, the decay of color centers is well described in terms of bimolecular annihilation reactions between electron and hole centers. Similar processes are also occurring in single crystal sodium chloride. Finally, we report fabrication of permanent periodic patterns in soda lime glass by two time coincident femtosecond laser pulses.
机译：飞秒激光所具有的高瞬时功率可以使许多名义上透明的材料着色。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变的发展变得复杂。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苏打石灰玻璃和单晶氯化钠中产生的色心的演变，时间范围从微秒到数百秒。通过使用适当选择的聚焦在飞秒激光点上的探测激光器，我们可以跟踪由于单个或多个飞秒脉冲而导致的颜色变化，并在飞秒激光辐射终止后长时间跟踪该颜色的变化。对于钠钙玻璃，色心的衰减可以用电子和空穴中心之间的双分子an灭反应很好地描述。在单晶氯化钠中也发生类似的过程。最后，我们报告了通过两次重合的飞秒激光脉冲在钠钙玻璃中制造永久性周期性图案的过程。

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