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1.5  kW efficient CW Nd:YAG planar waveguide MOPA laser.

Juntao Wang, Zhenhai Wu, Hua Su

    Optics Letters
    |August 16, 2017
    PubMed
    Summary

    Researchers developed a high-power 1064 nm Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) planar waveguide laser. This advanced laser system achieved a record output power of 1544 W, demonstrating significant progress in laser technology.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Planar waveguide lasers offer advantages in beam quality and thermal management.
    • High-power solid-state lasers are crucial for various industrial and scientific applications.
    • Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) is a widely used gain medium for lasers.

    Purpose of the Study:

    • To report a high-power continuous wave Nd:YAG planar waveguide laser.
    • To investigate the master oscillator power amplification (MOPA) architecture for scaling output power.
    • To achieve record-breaking output power for this type of laser system.

    Main Methods:

    • Utilized a fiber laser as the master oscillator and diode laser arrays as the pump source.
    • Employed a Nd:YAG planar waveguide with dimensions 1mm(T)×10mm(W)×60mm(L).

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  • Implemented dual-end oblique pumping with varying angles for efficient energy transfer.

    • Main Results:

    • Achieved a continuous wave output power of 1544 W at 1064 nm.
    • Demonstrated power scaling from 323 W to 1544 W with 2480 W pump power.
    • Obtained an optical-to-optical efficiency of 49% and measured beam quality M² of 2.8 (guided) and 7.0 (unguided).

    Conclusions:

    • The developed Nd:YAG planar waveguide laser represents the highest output power reported to date for this technology.
    • The MOPA configuration with dual-end oblique pumping is effective for high-power laser generation.
    • This work paves the way for more powerful and efficient waveguide laser systems.