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Related Concept Videos

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Related Experiment Video

Updated: Jun 17, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display
09:04

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

Published on: January 14, 2020

Thick holograms in photochromic materials.

D R Bosomworth, H J Gerritsen

    Applied Optics
    |January 12, 2010
    PubMed
    Summary

    Thick hologram storage was achieved in calcium fluoride (CaF2) and strontium titanate (SrTiO3) photochromic crystals. These materials show promise for advanced holographic data storage applications.

    Area of Science:

    • Materials Science
    • Optics
    • Crystallography

    Background:

    • Photochromic crystals offer potential for holographic data storage.
    • Thick hologram storage requires specific material properties and laser interactions.

    Purpose of the Study:

    • To demonstrate and study thick hologram storage in CaF2 and SrTiO3 photochromic crystals.
    • To evaluate the performance of these materials for holographic applications.

    Main Methods:

    • Utilized a 2-mW laser at 6328 Angstroms for hologram recording.
    • Measured exposure times and angular sensitivity of hologram intensity.
    • Determined effective hologram thickness in SrTiO3 crystals.

    Main Results:

    • Achieved good holograms with exposure times ranging from 2 to 30 seconds.

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  • Angular sensitivity in CaF2 crystals aligned with theoretical predictions.
  • Angular sensitivity measurements in SrTiO3 crystals allowed for effective thickness determination.

    • Conclusions:

    • CaF2 and SrTiO3 crystals are viable for thick hologram storage.
    • Further improvements in photochromic materials are suggested for enhanced performance.
    • This research contributes to the development of advanced holographic storage technologies.