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Micro-to-Nanoscale Characterization of Femtosecond Laser Photo-Inscribed Microvoids.

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Summary

This study reveals the structure and high-temperature behavior of femtosecond laser-inscribed microvoids in optical fibers. These microvoids are crucial for developing robust fiber Bragg gratings for harsh environment sensing applications.

Keywords:
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Area of Science:

  • Materials Science
  • Optical Engineering
  • Photonics

Background:

  • Fiber Bragg gratings (FBGs) are essential for optical fiber sensing, especially in demanding environments.
  • Type III fs-gratings utilize periodic microvoids inscribed in optical fiber cores.
  • Understanding microvoid characteristics is key to enhancing FBG performance and durability.

Purpose of the Study:

  • To investigate the structural and chemical properties of femtosecond laser-inscribed microvoids.
  • To analyze the high-temperature evolution of these microvoids.
  • To provide insights into the fabrication and reliability of type III fs-gratings.

Main Methods:

  • Femtosecond laser inscription of microvoids in optical fiber cores.
  • High-resolution imaging: quantitative phase microscopy, transmission electron microscopy, and scattering-type scanning near-field IR optical microscopy.
  • Step isochronal annealing up to 1250 °C to study high-temperature behavior.

Main Results:

  • Detailed characterization of microvoid structures and surrounding densified shells.
  • Observation of microvoid size and shape changes at elevated temperatures.
  • Identification of microvoid stability limits and transformation mechanisms.

Conclusions:

  • Femtosecond laser-inscribed microvoids exhibit distinct structural features and predictable high-temperature responses.
  • The findings are critical for designing advanced fiber Bragg gratings for extreme conditions.
  • This research advances the understanding of laser-matter interactions in optical fibers for sensor technology.