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Updated: Aug 9, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Improved laser phase locking with intra-cavity adaptive optics.

Amit Pando, Sagie Gadasi, Asher Friesem

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    Summary
    This summary is machine-generated.

    We improved phase locking in coupled lasers by reducing frequency spread using intra-cavity adaptive optics. This method significantly enhances laser array performance and is suitable for weakly coupled systems.

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    Area of Science:

    • Optics
    • Laser Physics
    • Adaptive Optics

    Background:

    • Phase locking of coupled lasers is crucial for applications requiring high-intensity coherent light.
    • The natural frequency spread of individual lasers in an array is a major limitation for achieving stable phase locking.
    • Existing methods often struggle with large laser arrays or weakly coupled systems.

    Purpose of the Study:

    • To develop and demonstrate an intra-cavity adaptive optics method for improving phase locking in coupled laser systems.
    • To overcome the limitations imposed by the natural frequency spread of lasing frequencies.
    • To enhance the performance of large laser arrays.

    Main Methods:

    • Implementation of an intra-cavity adaptive optics system utilizing a spatial light modulator (SLM).
    • Employment of an iterative optimization algorithm to control the SLM and minimize frequency spread.
    • Characterization of phase locking enhancement using metrics like peak intensity and inverse participation ratio (IPR) of far-field distributions.

    Main Results:

    • Demonstrated a fourfold enhancement in phase locking for an array of 450 coupled lasers.
    • Quantified improvement through significant increases in peak far-field intensity and IPR.
    • Showcased the long-lasting nature of the achieved phase locking.
    • Confirmed the method's suitability for phase locking even weakly coupled lasers.

    Conclusions:

    • Intra-cavity adaptive optics effectively reduces frequency spread, thereby enabling robust phase locking in coupled laser systems.
    • The presented method offers a significant and lasting improvement in laser array performance.
    • This technique provides a viable solution for phase locking large and weakly coupled laser arrays.