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首页> 外文会议>Frontiers in ultrafast optics: biomedical, scientific, and industrial applications XVII >Reproducing space weathering of olivine by using high-energy femtosecond laser pulses
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Reproducing space weathering of olivine by using high-energy femtosecond laser pulses

机译：利用高能飞秒激光脉冲再现橄榄石的空间风化

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摘要

Atmospheric-free bodies of the solar system are undergoing several processes that alter their original spectral characteristics. The whole of these processes is the so-called space weathering. The surface of such bodies is exposed to the solar wind irradiation and to the ongoing bombardment of micrometeoroids yielding material modifications at the micro- and nanometer scale. In order to understand these processes and clarify the influence on spectral reflectance and absorption, numerous experimental approaches using ion and laser irradiation have been presented so far. However, up to this date, basic damaging mechanisms are still unresolved or cannot be completely reproduced. In this work, we present the application of ultra-short laser pulses as a tool to reproduce space weathering, with focus on micrometeoroid impacts. In our experiments, slices of single-crystal olivine were irradiated under vacuum condition using 100 fs single-shot laser pulses. In order to perform spectral measurements, the laser-damaged regions were distributed over the sample surface within a grid geometry. After laser processing, a comprehensive study was performed by using spectroscopic measurements in the NUV-vis-NIR range, white light interferometry, SEM and TEM analysis. The cross-sections of the laser-generated craters reveal different layers including from the top to the bottom: an amorphous layer, two polycrystalline layers with different textures, and a defect-rich olivine substrate. Moreover, iron nanoparticles occur within the lower part of the amorphous layer and the polycrystalline layer. We can reproduce microcraters whose morphology, microstructure, and distribution of iron nanoparticles are similar to those found in the soil samples of the Moon or of the asteroid 25143 Itokawa.
机译：太阳系的无大气体正在经历改变其原始光谱特征的若干过程。所有这些过程就是所谓的空间风化。这种物体的表面暴露在太阳风的照射下，并受到不断轰炸的微流星体的影响，从而产生了微米级和纳米级的材料改性。为了理解这些过程并弄清对光谱反射率和吸收的影响，到目前为止已经提出了许多使用离子和激光辐照的实验方法。但是，到目前为止，基本的损坏机制仍未解决或无法完全复制。在这项工作中，我们介绍了超短激光脉冲作为再现空间风化的工具的应用，重点是微流星体的撞击。在我们的实验中，使用100 fs单次激光脉冲在真空条件下辐照单晶橄榄石切片。为了执行光谱测量，将激光损坏的区域分布在网格几何形状内的样品表面上。激光加工后，通过使用NUV-vis-NIR范围内的光谱测量，白光干涉测量，SEM和TEM分析进行了全面研究。激光产生的陨石坑的横截面显示出不同的层，包括从上到下的层：非晶层，具有不同纹理的两个多晶层以及富含缺陷的橄榄石基底。而且，铁纳米颗粒出现在非晶层和多晶层的下部内。我们可以复制微陨石坑，其铁纳米颗粒的形态，微观结构和分布与在月球或小行星25143 Itokawa的土壤样品中发现的类似。

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