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Updated: May 5, 2026

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High-precision beam tracking using liquid crystal spatial light modulator based on spatially partitioned

Mingyang Sun, Duorui Gao, Mingze He

    Optics Express
    |May 4, 2026
    PubMed
    Summary

    A new spatially partitioned time-interleaved (SPTI) strategy enhances liquid crystal spatial light modulators (LCSLMs) for space laser communication. This method improves tracking accuracy and reduces power fluctuations, enabling reliable high-speed data transmission.

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    Area of Science:

    • Optical Engineering
    • Photonics
    • Space Communications

    Background:

    • Liquid crystal spatial light modulators (LCSLMs) offer non-mechanical steering for space laser communication.
    • Device viscosity limits response bandwidth, causing phase distortions and power fluctuations under dynamic conditions.

    Purpose of the Study:

    • To propose and validate a novel phase updating strategy for LCSLMs to overcome bandwidth limitations.
    • To enhance pointing, acquisition, and tracking (PAT) performance in high-dynamic space laser communication.

    Main Methods:

    • Developed a spatiotemporal phase evolution model for LCSLMs.
    • Implemented a spatially partitioned time-interleaved (SPTI) phase updating strategy.
    • Validated the SPTI strategy through simulations and experimental testing.

    Main Results:

    • The SPTI strategy improved tracking accuracy by 40% compared to conventional methods.
    • Received optical power fluctuations were suppressed by 60%.
    • Enabled error-free 10 Gbps communication within a 10° angular range.

    Conclusions:

    • The SPTI strategy effectively mitigates dynamic bandwidth limitations in LCSLMs.
    • This approach significantly expands the operational capabilities of LCSLMs in demanding space laser communication environments.