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Updated: Jun 23, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Self-imaging and high-beam-quality operation in multi-mode planar waveguide optical amplifiers.

Howard Baker, Jason Lee, Denis Hall

    Optics Express
    |May 14, 2009
    PubMed
    Summary

    Self-imaging in multi-mode waveguides can maintain laser beam quality during amplification. This method is evaluated for high-power, diode-pumped waveguide lasers, considering misalignment and thermal effects.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Waveguide Technology

    Background:

    • Maintaining high beam quality is crucial for high-power laser applications.
    • Waveguide lasers offer advantages in power scaling and beam control.
    • Self-imaging is a phenomenon that can potentially preserve beam properties.

    Purpose of the Study:

    • To investigate self-imaging as a technique for preserving fundamental Gaussian beam quality during amplification in multi-mode active waveguides.
    • To evaluate the feasibility of using self-imaging in high average power, diode-pumped, planar waveguide lasers.

    Main Methods:

    • Theoretical analysis of self-imaging in active multi-mode waveguides.
    • Numerical simulations to assess beam quality preservation.
    • Evaluation of misalignment tolerance, gain saturation, and thermal lensing effects.

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    Main Results:

    • Self-imaging demonstrates potential for maintaining beam quality in amplified Gaussian beams within multi-mode waveguides.
    • The study quantifies the impact of misalignment, gain saturation, and thermal lensing on the self-imaging process.
    • Performance is assessed for high average power, diode-pumped, planar waveguide laser systems.

    Conclusions:

    • Self-imaging is a viable method for preserving beam quality in specific waveguide laser configurations.
    • Understanding and mitigating misalignment, gain saturation, and thermal lensing are critical for practical implementation.
    • This technique shows promise for advanced high-power laser development.