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Spectral shifts produced by source correlations.

D Faklis, G M Morris

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Partially coherent light sources can cause spectral frequency shifts in the far field. A Fourier achromat generates a source violating scaling laws, leading to observable spectral displacement and distortion.

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    Area of Science:

    • Optics and Photonics
    • Statistical Optics
    • Wave Phenomena

    Background:

    • The spectral properties of light from partially coherent sources are influenced by statistical correlations.
    • A specific scaling law for the correlation function of emitted radiation governs far-field spectral behavior.
    • Deviations from this scaling law can lead to unexpected spectral shifts.

    Purpose of the Study:

    • To investigate spectral shifts and distortions in partially coherent light.
    • To explore the effect of violating a specific scaling law on spectral properties.
    • To demonstrate the use of a Fourier achromat in generating such a source.

    Main Methods:

    • Utilized a Fourier achromat to create a secondary source with wavelength-independent spectral coherence.
    • This generated source intentionally violates the established scaling law.
    • Measured and analyzed the spectrum of light in the far field of this secondary source.

    Main Results:

    • The far-field spectrum showed significant frequency displacement and distortion compared to the source spectrum.
    • The direction of frequency shift (higher or lower) was dependent on the observation angle.
    • Confirmed that violating the scaling law leads to observable spectral modifications.

    Conclusions:

    • Statistical correlations in partially coherent light, when violating the scaling law, induce far-field spectral shifts.
    • Fourier achromats are effective tools for engineering sources with such properties.
    • The observed spectral displacement offers potential for novel optical phenomena and applications.