Demonstration of Type A volume Bragg gratings inscribed with a femtosecond Gaussian-Bessel laser beam

Data set from Demonstration of Type A volume Bragg gratings inscribed with a femtosecond Gaussian-Bessel laser beam - Publication : Harb J., Talbot L., Petit Y., Bernier M. and Canioni L. Demonstration of Type A volume Bragg gratins inscribed with a femtosecond Gaussian-Bessel laser beam. Opt. Express 2023 vol. 31, n°10, p. 15736-15746. HAL : https://hal.science/hal-04085272 Dataset production context : To our knowledge, we report on the first demonstration of Type A VBGs inscribed in silver-containing phosphate glasses by femtosecond laser writing. The gratings are inscribed plane-by-plane by scanning the voxel of a 1030 nm Gaussian-Bessel inscription beam. This results in a refractive-index modification zone, induced by the appearance of silver clusters, extending over a much larger depth than those obtained with standard Gaussian beams. As a result, a high diffraction efficiency of 95% at 632.8 nm is demonstrated for a 2-µm period transmission grating with a 150-µm effective thickness indicating a strong refractive-index modulation of 1.78 × 10−3. Meanwhile, a refractive-index modulation of 1.37 × 10−3 was observed at a wavelength of 1.55 µm. Thus, this work opens the avenue for highly effective femtosecond-written VBGs suitable for industrial applications. For more information see the article.

本数据集源自《飞秒高斯-贝塞尔激光束刻写A型体布拉格光栅》的演示研究——发表文献：Harb J.、Talbot L.、Petit Y.、Bernier M.与Canioni L.，《Demonstration of Type A volume Bragg gratings inscribed with a femtosecond Gaussian-Bessel laser beam》，Opt. Express 2023年第31卷第10期，页码15736-15746，HAL存档链接：https://hal.science/hal-04085272。数据集制作背景：据我们所知，本研究首次演示了在含银磷酸盐玻璃中通过飞秒激光直写技术刻写A型体布拉格光栅（Type A volume Bragg grating, VBG）的工作。研究采用1030 nm高斯-贝塞尔刻写光束的体素逐面扫描的方式刻写光栅。该刻写过程通过银团簇的形成诱导折射率改性区域，其深度远大于标准高斯光束刻写所得的改性区域。实验结果表明，针对周期为2 μm、有效厚度为150 μm的透射光栅，在632.8 nm波长下实现了95%的高衍射效率，对应折射率调制强度达1.78×10⁻³，展现出极强的折射率调制能力。同时，在1.55 μm波长下观测到的折射率调制强度为1.37×10⁻³。综上，本研究为适用于工业应用的高效飞秒直写体布拉格光栅开辟了新的研究路径。更多细节可参阅原文。