Quantitative estimate of fs-laser induced refractive index changes in the bulk of various transparent materials

Quantitative estimate of fs-laser induced refractive index changes in the bulk of various transparent materials
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飞秒激光引起的各种透明材料块体折射率变化的定量估计

DOI:
10.1117/12.2051590
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
A. Rosenfeld
A. Rosenfeld
中科院分区:
--
文献类型:
--
作者:
A. Mermillod-Blondin;T. Seuthe;M. Eberstein;M. Grehn;J. Bonse;A. Rosenfeld

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在过去的几年里,基于激光诱导透明材料体积折射率变化的许多应用已经被展示出来。超短脉冲激光提供了在三维空间加工大体积透明材料的可能性,这表明激光直接写入将在集成微光学的发展中发挥决定性作用。目前,3D长期数据存储或嵌入式激光打标等应用已经进入产业发展阶段。然而,要获得激光引起的折射率变化的定量估计仍然是非常具有挑战性的。另一方面,最近发展了几种显微技术来表征原位的体折射率变化。它们大多被应用于生物目的。其中,空间光干涉显微镜(SLIM)以最小的采集后数据处理提供了非常好的稳健性。本文报道了利用SLIM测量飞秒激光在不同玻璃材料中引起的折射率变化,这些玻璃材料包括熔融二氧化硅和硼砂玻璃(B33)。讨论了SLIM与经典相差显微镜相比的优点。
Over the past years, many applications based on laser-induced refractive index changes in the volume of transparent materials have been demonstrated. Ultrashort pulse lasers offer the possibility to process bulky transparent materials in three dimensions, suggesting that direct laser writing will play a decisive role in the development of integrated micro-optics. At the present time, applications such as 3D long term data storage or embedded laser marking are already into the phase of industrial development. However, a quantitative estimate of the laser-induced refractive index change is still very challenging to obtain. On another hand, several microscopy techniques have been recently developed to characterize bulk refractive index changes in-situ. They have been mostly applied to biological purposes. Among those, spatial light interference microscopy (SLIM), offers a very good robustness with minimal post acquisition data processing. In this paper, we report on using SLIM to measure fs-laser induced refractive index changes in different common glassy materials, such as fused silica and borofloat glass (B33). The advantages of SLIM over classical phase-contrast microscopy are discussed.
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