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Diode pumped yellow dysprosium lasers.

S R Bowman1, S O'Connor, N J Condon

  • 1Optical Material & Devices Branch US Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375, USA. steven.bowman@nrl.navy.mil

Optics Express
|June 21, 2012
PubMed
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Researchers report the first laser operation of a dysprosium-doped yttrium aluminum garnet crystal. This new laser efficiently produces visible light at room temperature using gallium nitride diode lasers.

Area of Science:

  • Laser physics
  • Materials science
  • Solid-state lighting

Background:

  • The 4F₉/₂ → 6H₁₃/₂ transition in dysprosium (Dy³⁺) ions is a promising candidate for visible lasers.
  • Yttrium aluminum garnet (Y₃Al₅O₁₂ or YAG) is a well-established host material for solid-state lasers.

Purpose of the Study:

  • To demonstrate the first operation of a laser based on the 4F₉/₂ → 6H₁₃/₂ transition in Dy³⁺-doped YAG.
  • To investigate the performance of this laser system under diode laser pumping at room temperature.

Main Methods:

  • Fabrication of a Dy³⁺:YAG crystal.
  • Pumping the crystal with a 447 nm GaN diode laser.
  • Characterization of the laser output, including wavelength, efficiency, and operating mode.

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Main Results:

  • Successful room-temperature laser operation at 583 nm.
  • Demonstration of Gaussian single-mode output.
  • Achieved a slope efficiency of 12% (non-optimized).
  • Generated 150 mW of millisecond pulsed output, limited by pump source brightness.

Conclusions:

  • The Dy³⁺:YAG laser operating on the 4F₉/₂ → 6H₁₃/₂ transition is feasible for visible light generation.
  • GaN diode laser pumping enables efficient room-temperature operation.
  • Further optimization, particularly of the pump source, could significantly enhance output power.