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Updated: Aug 16, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Simple and fast calibration method for phase-only spatial light modulators.

Minchol Lee, Donghoon Koo, Jeongmin Kim

    Optics Letters
    |December 23, 2022
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    Summary

    We present a fast Twyman-Green interferometry method to calibrate spatial light modulators (SLMs). This technique accurately corrects phase response and optical flatness variations with minimal interferograms, improving phase control in optical applications.

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    Area of Science:

    • Optics and Photonics
    • Optical Metrology
    • Advanced Materials

    Background:

    • Phase-only spatial light modulators (SLMs) are crucial for manipulating light phase in diverse optical systems.
    • Liquid-crystal-on-silicon (LCOS) SLMs exhibit inherent spatial non-uniformities in phase response and optical flatness, hindering precise phase control.
    • Accurate calibration is essential to overcome these limitations and achieve reliable performance in SLM-based applications.

    Purpose of the Study:

    • To develop a simple, fast, and accurate method for simultaneously calibrating phase response and optical flatness of SLMs.
    • To reduce the number of required interferograms for SLM calibration compared to traditional phase-shifting interferometry (PSI) methods.
    • To enable single-pixel resolution characterization of SLM non-uniformities without requiring a piezoelectric transducer.

    Main Methods:

    • Utilized Twyman-Green interferometry to capture interference patterns modulated by the SLM's gray level.
    • Developed a novel approach to extract phase response and optical flatness variations from a reduced set of interferograms.
    • Acquired interferograms rapidly without the need for active phase stabilization, mitigating phase drift concerns.

    Main Results:

    • Successfully demonstrated simultaneous extraction of SLM phase response and optical flatness non-uniformities at single-pixel resolution.
    • Achieved flatness correction accuracy comparable to traditional N-step phase shift interferometry (PSI) using significantly fewer interferograms (e.g., 18).
    • Validated the effectiveness and speed of the proposed calibration procedure for practical SLM applications.

    Conclusions:

    • The proposed Twyman-Green interferometry-based method offers an efficient and accurate solution for calibrating LCOS SLMs.
    • This technique significantly reduces calibration time and complexity, making precise phase control more accessible.
    • The method provides a robust approach to compensate for inherent SLM non-uniformities, enhancing performance in advanced optical applications.