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Related Concept Videos

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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Phase Contrast and Differential Interference Contrast Microscopy

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Related Experiment Video

Updated: Jul 6, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

High focal depth with a pure-phase apodizer.

H Wang, F Gan

    Applied Optics
    |March 28, 2008
    PubMed
    Summary

    Pure-phase superresolution apodizers enhance optical data storage by extending the depth of focus (DOF) and reducing spot size. This innovation improves optical pickup systems for high-density data storage applications.

    Area of Science:

    • Optical Engineering
    • Data Storage Technologies
    • Nanophotonics

    Background:

    • High-density optical data storage relies on high-numerical-aperture (NA) lenses and short wavelengths.
    • Increasing NA and decreasing wavelength significantly reduce the depth of focus (DOF).

    Purpose of the Study:

    • To propose and evaluate pure-phase superresolution apodizers for optimizing axial intensity distribution.
    • To extend the depth of focus (DOF) in optical pickup systems.

    Main Methods:

    • Implementation of pure-phase superresolution apodizers in optical systems.
    • Analysis of axial intensity distribution and spot size characteristics.

    Main Results:

    • Achieved a 2-4.88 times greater expected depth of focus (DOF) compared to original systems.

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    Related Experiment Videos

    Last Updated: Jul 6, 2026

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
    10:16

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

    Published on: February 8, 2014

    Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
    14:09

    Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope

    Published on: April 7, 2014

  • Demonstrated a reduction in spot size compared to original systems.

    • Conclusions:

    • Pure-phase superresolution apodizers effectively extend the DOF for optical data storage.
    • These apodizers offer a viable solution for improving optical pickup performance and enabling higher data densities.