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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Optical Kerr effect in long fibers.

J M Dziedzic, R H Stolen, A Ashkin

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    High optical Kerr modulation exceeding 100% was achieved in long birefringent optical fibers with low laser power. This research explores applications in fast optical shutters, potentially enabling sub-picosecond resolution times.

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    Area of Science:

    • Nonlinear Optics
    • Photonics
    • Fiber Optics

    Background:

    • The optical Kerr effect describes the intensity-dependent refractive index change in optical materials.
    • Birefringent optical fibers exhibit different refractive indices for different polarizations of light.
    • Achieving high modulation depths at low optical powers is crucial for practical applications.

    Purpose of the Study:

    • To demonstrate and investigate high optical Kerr modulation in long birefringent optical fibers.
    • To explore the feasibility of using this modulation for fast optical switching applications.
    • To analyze the influence of various physical parameters on the modulation performance.

    Main Methods:

    • Experimental demonstration of optical Kerr modulation in long birefringent fibers.
    • Investigation of group-velocity dispersion effects.
    • Analysis of polarization thermal stability.
    • Characterization of fiber birefringence.

    Main Results:

    • Optical Kerr modulation exceeding 100% was achieved using low laser powers (~1 W).
    • The study analyzed the impact of group-velocity dispersion, polarization stability, and fiber birefringence.
    • The potential for sub-picosecond resolution times was identified for optical shutter applications.

    Conclusions:

    • High optical Kerr modulation is achievable in long birefringent fibers at low power.
    • Fiber Kerr modulation shows promise as a fast optical shutter.
    • Sub-picosecond resolution times are theoretically possible, paving the way for advanced optical switching technologies.