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Ultralow quantum-defect eye-safe Er:Sc2O3 laser.

Nikolay Ter-Gabrielyan1, Larry D Merkle, Akio Ikesue

  • 1US Army Research Laboratory, 2800 Powder Mill Rd, Adelphi, Maryland 20783, USA.

Optics Letters
|July 3, 2008
PubMed
Summary

Researchers achieved a record-low quantum defect (QD) eye-safe laser using resonantly pumped Erbium-doped Scandium Oxide (Er(3+):Sc2O3) at liquid nitrogen temperature. This breakthrough demonstrates efficient laser operation with significant potential for advanced optical applications.

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Area of Science:

  • Laser Physics
  • Materials Science
  • Optoelectronics

Background:

  • Erbium-doped materials are crucial for 1550 nm fiber lasers.
  • Scandium Oxide (Sc2O3) offers promising host properties for rare-earth ions.
  • Minimizing quantum defect is key for improving laser efficiency and reducing waste heat.

Purpose of the Study:

  • To demonstrate resonantly pumped Er(3+):Sc2O3 laser operation.
  • To achieve a significantly low quantum defect (QD) for eye-safe laser applications.
  • To evaluate the laser performance at liquid nitrogen temperature.

Main Methods:

  • Utilizing resonant pumping at 1535 nm for Er(3+):Sc2O3.
  • Operating the laser system at liquid nitrogen temperature (77 K).
  • Measuring laser output power, wavelength, and slope efficiency.

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Main Results:

  • Achieved laser operation at 1558 nm with a low quantum defect of 1.5%.
  • Obtained a slope efficiency exceeding 45%.
  • Generated continuous-wave (CW) output power of over 3.3 W.

Conclusions:

  • The Er(3+):Sc2O3 laser demonstrates the lowest quantum defect ever reported for an eye-safe laser.
  • High slope efficiency and output power indicate the potential of this material system.
  • This development paves the way for more efficient and compact eye-safe laser sources.