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Related Experiment Video

Updated: Jan 19, 2026

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Encoding of arbitrary micrometric complex illumination patterns with reduced speckle.

Miguel Carbonell-Leal, Gladys Mínguez-Vega, Jesús Lancis

    Optics Express
    |September 11, 2019
    PubMed
    Summary

    A new complex illumination method (CIM) enables precise, large-area excitation in nonlinear microscopy, overcoming limitations of spatial light modulators (SLMs) and iterative Fourier transform algorithms (IFTAs) for clearer imaging.

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    Area of Science:

    • Nonlinear optics and microscopy
    • Advanced optical imaging techniques
    • Photonics and light manipulation

    Background:

    • Phase-only spatial light modulators (SLMs) enable simultaneous two-photon excitation and fluorescence emission from specific regions of interest (ROIs) in nonlinear microscopy.
    • Iterative Fourier transform algorithms (IFTAs) used with SLMs approximate ROI illumination, leading to spatial irregularities and speckle noise, affecting image formation and signal acquisition.

    Purpose of the Study:

    • To introduce and validate a complex illumination method (CIM) for generating simultaneous excitation of large-area ROIs.
    • To overcome the limitations of spatial irregularities and speckle noise associated with IFTAs in nonlinear microscopy.
    • To achieve full control over the amplitude and phase of light for improved illumination patterns.

    Main Methods:

    • Development of a complex illumination method (CIM) offering precise control over light amplitude and phase.
    • Experimental demonstration of CIM for structured illumination over large-area ROIs.
    • Application of CIM for single-photon and second harmonic generation (SHG) imaging.

    Main Results:

    • CIM successfully generates simultaneous excitation of large-area ROIs with reduced speckle noise.
    • Demonstrated improved control over illumination patterns compared to IFTA-based methods.
    • Successful experimental validation of CIM for both single-photon and SHG imaging.

    Conclusions:

    • The proposed complex illumination method (CIM) offers a significant advancement for nonlinear microscopy.
    • CIM provides enhanced control and reduced noise for imaging large-area ROIs.
    • This method holds potential for improving image quality and signal acquisition in various nonlinear optical imaging applications.