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首页> 外文期刊>Optical Materials >Production and characterization of femtosecond laser-written double line waveguides in heavy metal oxide glasses
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Production and characterization of femtosecond laser-written double line waveguides in heavy metal oxide glasses

机译：重金属氧化物玻璃中飞秒激光写入双线波导的生产与表征

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摘要

We report the fabrication and characterization of double line waveguides directly written in tellurite and germanate glasses using a femtosecond laser delivering 30 mu J, 80 fs pulses at 4 kHz repetition rate. The double line waveguides produced presented internal losses inferior to 2.0 dB/cm. The output mode profile and the M-2 measurements indicate multimodal guiding behavior. A better beam quality for the GeO2 - Pbo waveguide was observed when compared with TeO2 - ZnO glass. Raman spectroscopy of the waveguides showed structural modification of the glassy network and indicates that a negative refractive index modification occurs at the focus of the laser beam, therefore allowing for light guiding in between two closely spaced laser written lines. The refractive index change at 632 nm is around 10(-4), and the structural changes in the laser focal region of the writing, evaluated by Raman spectroscopy, corroborated our findings that these materials are potential candidates for optical waveguides and passive components. To the best of our knowledge, the two double line configuration demonstrated in the present work was not reported before for germanate or tellurite glasses. (C) 2017 Elsevier B.V. All rights reserved.
机译：我们报告了使用飞秒激光以4 kHz重复频率传送30μJ，80 fs脉冲的飞秒激光，直接在碲酸盐和锗酸盐玻璃中写入的双线波导的制造和表征。产生的双线波导呈现出低于2.0 dB / cm的内部损耗。输出模式配置文件和M-2测量值指示多模式引导行为。与TeO2-ZnO玻璃相比，GeO2-Pbo波导的光束质量更好。波导的拉曼光谱显示出玻璃状网络的结构改变，并表明在激光束的焦点处发生了负折射率改变，因此允许在两条紧密间隔的激光写入线之间进行光导。在632 nm处的折射率变化约为10（-4），并且通过拉曼光谱法评估笔迹的激光焦点区域的结构变化，证实了我们的发现：这些材料是光波导和无源组件的潜在候选者。据我们所知，本工作中演示的两条双线配置以前未报告过德国或碲酸盐玻璃。 （C）2017 Elsevier B.V.保留所有权利。

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