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Continuous-wave and passively Q-switched cladding-pumped planar waveguide lasers.

R J Beach, S C Mitchell, H E Meissner

    Optics Letters
    |November 28, 2007
    PubMed
    Summary
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    High-power diode-pumped Yb:YAG and Nd:YAG waveguide lasers achieved over 12 W and 8 W average output power, respectively. These lasers demonstrate efficient optical-optical conversion and potential for compact, high-performance laser systems.

    Area of Science:

    • Laser Physics
    • Materials Science
    • Optical Engineering

    Background:

    • Diode-pumped solid-state lasers are crucial for various applications.
    • Planar waveguide lasers offer advantages in beam quality and thermal management.
    • Ytterbium-doped YAG (Yb:YAG) and Neodymium-doped YAG (Nd:YAG) are established laser gain media.

    Purpose of the Study:

    • To demonstrate high average output power from diode-pumped cladding-pumped Yb:YAG and Nd:YAG planar waveguide lasers.
    • To investigate the performance characteristics, including efficiency and beam quality.
    • To integrate a Q-switched element for pulsed operation in the Nd:YAG system.

    Main Methods:

    • Fabrication of cladding-pumped planar waveguide structures using Yb:YAG and Nd:YAG materials.

    Related Experiment Videos

  • Diode pumping of the waveguide lasers at appropriate wavelengths.
  • Characterization of output power, beam quality, polarization, and optical-optical conversion efficiency.
  • Integration of a Cr(4+):YAG passive Q-switch into the Nd:YAG waveguide for pulsed operation.

    • Main Results:

    • Achieved >12 W average output power from a diode-pumped Yb:YAG waveguide laser with diffraction-limited beam quality in the guiding dimension.
    • Demonstrated a slope efficiency of 0.5 W/W and peak optical-optical conversion efficiency of 0.31 W/W for the Yb:YAG laser.
    • Generated >8 W average output power from a Q-switched Nd:YAG waveguide laser.
    • Achieved 3 ns pulse widths and 80 kHz pulse repetition frequencies for the Q-switched Nd:YAG laser, with 0.28 W/W slope efficiency and 0.21 W/W peak optical-optical conversion efficiency.

    Conclusions:

    • Diode-pumped cladding-pumped planar waveguide lasers are capable of delivering high average output power.
    • The Yb:YAG system offers efficient, linearly polarized, and diffraction-limited output.
    • The integrated Q-switched Nd:YAG waveguide laser demonstrates effective pulsed operation with high repetition rates and short pulse durations.