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Multiple pulses laser irradiation study in silica: Comparison between 1064nm and 355nm

机译：二氧化硅中的多脉冲激光辐照研究：1064nm和355nm之间的比较

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Cumulative laser irradiations are performed on silica at 1064nm and 355nm with a 7ns pulsed laser. The experiments are made in bulk and surface of materials thanks to a focused beam (12μm and 8μm respectively for each wavelength). The small beam size combined to a reliable statistical measurement of laser damage, allow us to plot accurate laser damage probability curves. Moreover the use of an adapted statistic model permit to deduce from these curves the laser damage precursor centers densities. These nano-sized precursors are established by different works to be responsive of the breakdown initiation. In a previous work realized at 1064nm, we have observed in our specific conditions, that multiple irradiation leads clearly to a decrease of the laser damage threshold. Furthermore we have highlighted that at this wavelength, the precursor densities were invariant with the number of shot. These results had given novel information about the damage initiation process. Indeed the same precursor centers seems to be involved in the initiation process in spite of the decrease of they laser damage threshold whatever the number of shot. In this paper we will shown new results obtained at 355nm in silica with the same measurement process. The case of silica surface is also examined for the two wavelengths. The experimental data exhibit a strong different behavior, regarding the precursor densities evolution versus the number of shot.
机译：使用7ns脉冲激光在1064nm和355nm的二氧化硅上进行累积激光照射。借助聚焦光束（每个波长分别为12μm和8μm），可以在材料的主体和表面上进行实验。小光束尺寸加上可靠的激光损伤统计测量值，使我们能够绘制出准确的激光损伤概率曲线。此外，使用合适的统计模型允许从这些曲线推断出激光损伤前体中心密度。这些纳米级前体是通过不同的工作建立的，以响应击穿的开始。在先前在1064nm上实现的工作中，我们已经观察到在特定条件下多次照射显然会导致激光损伤阈值的降低。此外，我们强调了在此波长下，前驱物的密度随发射数量的变化而不变。这些结果提供了有关损伤引发过程的新颖信息。实际上，尽管它们的激光损伤阈值降低了，但无论发射多少次，相同的前驱物中心似乎都参与了引发过程。在本文中，我们将展示在355nm的二氧化硅中以相同的测量过程获得的新结果。还针对两个波长检查了二氧化硅表面的情况。关于前驱物密度演变与射出数量的关系，实验数据表现出强烈的不同行为。

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