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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High efficiency, resonantly diode pumped, double-clad, Er:YAG-core, waveguide laser.

N Ter-Gabrielyan1, V Fromzel, X Mu

  • 1US Army Research Laboratory, 2800 Powder Mill Rd., Adelphi, MD 2078, USA. nikolay.e.ter-gabrielyan.civ@mail.mil

Optics Express
|November 29, 2012
PubMed
Summary

This study presents a highly efficient, crystalline waveguide laser using an Erbium-doped YAG (Er:YAG) core. The novel double-clad structure achieved significant output power at eye-safe wavelengths.

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Area of Science:

  • Materials Science
  • Laser Physics
  • Photonics

Background:

  • Development of efficient and compact laser sources is crucial for various applications.
  • Crystalline waveguides offer advantages in power handling and beam quality.
  • Eye-safe laser operation is desirable for applications involving human exposure.

Purpose of the Study:

  • To demonstrate a highly efficient, diode-pumped, all-crystalline, double-clad waveguide laser.
  • To investigate the performance of an Erbium-doped YAG (Er:YAG) crystalline core.
  • To achieve laser output at eye-safe wavelengths.

Main Methods:

  • Fabrication of a double-clad waveguide with an Er:YAG crystalline core and YAG cladding, over-clad with magnesium aluminum spinel.
  • Resonant diode-pumping of the waveguide structure using a fiber-coupled InGaAsP/InP laser diode module at ~1532 nm.

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  • Characterization of output power, beam quality, and slope efficiency at ~1645 nm and ~1616.6 nm.

    • Main Results:

    • Achieved 25.4 W of continuous-wave (CW) output power at 1645 nm with a beam quality of M² ~2.6.
    • Demonstrated a slope efficiency of 56.6% with respect to absorbed pump power.
    • Delivered ~8 W of output power at 1616.6 nm using a wavelength-selective cavity.

    Conclusions:

    • Successfully demonstrated the first crystalline Er:YAG-core, double-clad crystalline waveguide laser.
    • The device exhibits high efficiency and significant output power at eye-safe wavelengths.
    • This work paves the way for advanced crystalline waveguide laser development.