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In-phased second harmonic wave array generation with intra-Talbot-cavity frequency-doubling.

Kenichi Hirosawa, Fumio Shohda, Takayuki Yanagisawa

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    The Talbot cavity method for laser synchronization produces anti-phase locking. Intra-Talbot-cavity frequency-doubling converts this to in-phase locking, generating a usable second harmonic wave array.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Talbot cavities are used for laser array phase synchronization.
    • Standard Talbot cavities result in out-phase locking, leading to undesirable 2-peak far-field profiles.
    • Achieving in-phase locking is crucial for many laser array applications.

    Purpose of the Study:

    • To develop a method for achieving in-phase locking in laser arrays using Talbot cavities.
    • To overcome the limitations of standard Talbot cavities that produce out-phase locking.
    • To generate a coherent, in-phase locked output from a laser array.

    Main Methods:

    • Implementation of intra-Talbot-cavity frequency-doubling by incorporating a nonlinear crystal.
    • Numerical simulations to model the frequency-doubling process within the Talbot cavity.
    • Experimental demonstration using a Nd:YVO₄ laser array.

    Main Results:

    • The proposed method successfully converts an out-phased fundamental wave array into an in-phase-locked second harmonic wave array.
    • Numerical calculations and experimental results confirm the generation of an in-phase locked second harmonic wave array.
    • A single, high-quality far-field profile was achieved for the second harmonic wave array.

    Conclusions:

    • Intra-Talbot-cavity frequency-doubling is an effective technique to achieve in-phase locking in laser arrays.
    • This method overcomes the inherent out-phase locking limitation of standard Talbot cavities.
    • The demonstrated technique provides a viable route to high-quality coherent output from laser arrays.