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Biology is a natural science that studies life and living organisms, including their structure, function, development, interactions, evolution, distribution, and taxonomy. The field's scope is extensive and divided into several specialized disciplines, such as anatomy, physiology, ethology, genetics, and many more. All living things share a few key traits, including cellular organization, heritable genetic material and the ability to adapt/evolve, metabolism to regulate energy needs, the...
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Related Experiment Video

Updated: Feb 14, 2026

Doppler Optical Coherence Tomography of Retinal Circulation
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Optical coherence grids and their propagation characteristics.

Lipeng Wan, Daomu Zhao

    Optics Express
    |February 7, 2018
    PubMed
    Summary

    Researchers introduce optical coherence grids (OCGs), a new light source generating stable far-field optical grids. These grids offer controllable patterns for applications like particle manipulation and atom cooling.

    Area of Science:

    • Optics and Photonics
    • Coherent Light Sources
    • Beam Propagation

    Background:

    • Partially coherent light sources are crucial for various optical applications.
    • Existing optical lattices offer limited control over light distribution.
    • Need for advanced light sources with stable, tunable far-field patterns.

    Purpose of the Study:

    • Introduce a novel class of partially coherent light sources: optical coherence grids (OCGs).
    • Investigate the propagation characteristics of OCG beams in free space.
    • Propose perfect optical coherence grids (POCGs) for enhanced control.

    Main Methods:

    • Theoretical introduction of OCGs and their generation.
    • Analysis of spectral density, transverse coherence, and M² factor of OCG beams.

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  • Convolution of the degree of coherence to define and analyze POCGs.

    • Main Results:

    • OCGs produce stable, periodic grid patterns in the far field.
    • Far-field grid structures are flexibly tunable via source correlation parameters.
    • POCGs offer fully controllable far-field grid patterns.

    Conclusions:

    • OCGs represent a new class of light sources with stable far-field grid generation.
    • The tunability of OCGs and POCGs opens possibilities for advanced optical control.
    • Potential applications include atom cooling, particle trapping, and cell assembly.