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Updated: May 7, 2025

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Supercontinuum generation in scintillator crystals.

Vaida Marčiulionytė1, Gintaras Tamošauskas1, Matas Šutovas1

  • 1Laser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223, Vilnius, Lithuania.

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|January 4, 2025
PubMed
Summary
This summary is machine-generated.

This study compares supercontinuum generation in scintillator crystals like gadolinium gallium garnet (GGG) and bismuth germanate (BGO). GGG and BGO show promise for low-threshold, high-power generation in the near-infrared spectrum.

Keywords:
High repetition rateInfraredLuminescenceScintillator crystalsSupercontinuum generation

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Area of Science:

  • Nonlinear Optics
  • Materials Science
  • Laser Physics

Background:

  • Supercontinuum generation is crucial for various spectroscopic applications.
  • Undoped scintillator crystals are explored as novel nonlinear media.
  • Femtosecond laser pulses enable efficient nonlinear phenomena in solids.

Purpose of the Study:

  • To experimentally compare supercontinuum generation (SCG) in several undoped scintillator crystals.
  • To evaluate the threshold and optimal pump energies for SCG in these materials.
  • To identify promising materials for low-threshold, high-average-power SCG.

Main Methods:

  • Comparative experimental study of SCG using 180 fs Yb:KGW laser pulses.
  • Systematic evaluation of spectral broadening dynamics and threshold pump energies.
  • Analysis of spectral cut-off wavelengths and red-shifted extent.

Main Results:

  • All tested nonlinear materials exhibited spectral broadening, with gadolinium gallium garnet (GGG) showing the largest red-shift (>2000 nm).
  • Bismuth germanate (BGO) and GGG demonstrated the lowest SCG thresholds and optical damage-free performance at 200 kHz.
  • Short-wavelength cut-offs correlated with material bandgaps, consistent with theoretical trends.

Conclusions:

  • Gadolinium gallium garnet (GGG) and bismuth germanate (BGO) are identified as superior alternatives to YAG and KGW for near- and short-wave infrared SCG.
  • These materials offer durable, optical damage-free performance suitable for high-average-power applications.
  • Bulk scintillator properties can be investigated via multiphoton excitation in the filamentation regime.