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Multiple pulse nanosecond laser induced damage study in LiB3O5 crystals.

Frank R Wagner1, Anne Hildenbrand, Jean-Yves Natoli

  • 1Institut Fresnel, CNRS, Aix-Marseille Université, Ecole Centrale Marseille, Marseille, France. frank.wagner@fresnel.fr

Optics Express
|January 4, 2011
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Summary

Researchers studied laser-induced damage in Lithium Triborate (LiB3O5) crystals using nanosecond pulses. They observed a fatigue effect, where damage thresholds decrease with more pulses, especially at 1064 nm, suggesting a statistical damage mechanism.

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Area of Science:

  • Materials Science
  • Optics
  • Laser Physics

Background:

  • Laser-induced damage in optical materials is critical for high-power laser systems.
  • Lithium Triborate (LiB3O5 or LBO) is a widely used nonlinear optical crystal.

Purpose of the Study:

  • Investigate multiple pulse nanosecond laser-induced damage in LBO crystals.
  • Characterize damage mechanisms and dependencies on laser wavelength and pulse number.
  • Determine the role of material properties in laser damage.

Main Methods:

  • Nanosecond laser irradiation at 1064 nm, 532 nm, and 355 nm.
  • Scanning electron microscopy (SEM) for damage site analysis.
  • Multi-pulse damage threshold measurements.

Main Results:

  • Damage sites exhibited distinct zones, similar to KDP crystals.
  • A significant fatigue effect (decreasing damage threshold with pulse number) was observed at 1064 nm, weaker at 532 nm, and absent at 355 nm.
  • Polarization-dependent damage threshold anisotropy was found at all wavelengths, most pronounced at 1064 nm.

Conclusions:

  • The observed fatigue effect suggests a statistical light-matter interaction mechanism.
  • Laser-induced damage in LBO is influenced by Li+ vacancy stabilized color centers.
  • Understanding these mechanisms is crucial for optimizing LBO crystal performance in laser applications.