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Updated: Jun 8, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Multirod unstable resonators for high-power solid-state lasers.

N Hodgson, G Bostanjoglo, H Weber

    Applied Optics
    |September 22, 2010
    PubMed
    Summary
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    This study optimized unstable resonators for lasers using variable mirrors and lenses. Unstable resonators achieved high power, but beam quality decreased with more active elements due to aberrations.

    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Unstable resonators are crucial for high-power laser systems.
    • Optimizing their design with variable components is key for performance.
    • Understanding beam quality limitations is essential for laser applications.

    Purpose of the Study:

    • To investigate the properties of unstable resonators with variable reflectivity mirrors and internal lenses.
    • To derive design rules for optimizing unstable resonators for multiple active laser elements.
    • To experimentally validate theoretical findings using a pulsed Nd:YAG laser system.

    Main Methods:

    • Theoretical analysis using the ABCD matrix formalism.
    • Experimental investigation with a pulsed Nd:YAG laser system (three rods).
    • Characterization of output power and beam-parameter products.

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    Last Updated: Jun 8, 2026

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    Main Results:

    • Unstable resonators achieved up to 75% of the maximum power of a flat-flat resonator.
    • Beam-parameter products ranged from 2 to 10 mm mrad.
    • Increased active elements within the resonator degraded beam quality.

    Conclusions:

    • Design rules for optimized unstable resonators were established.
    • Beam quality deterioration in multi-element unstable resonators is linked to spherical aberration and polarization-dependent refractive power differences.
    • The study provides insights for designing high-performance unstable resonator laser systems.