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Related Concept Videos

Crystallographic Point Groups01:29

Crystallographic Point Groups

Crystallographic point groups represent the various symmetry operations that can occur within crystals. They are unique in that at least one point will always remain unchanged during these actions. For instance, consider the triclinic system. This system, devoid of any axis or plane of symmetry, aligns with the C1 and Ci point groups.where Cᵢ is characterized solely by a center of inversion.Contrastingly, the monoclinic system introduces an element of symmetry. This system with one plane and...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Symmetry Elements in a Crystal01:27

Symmetry Elements in a Crystal

Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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Related Experiment Video

Updated: Jun 10, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Compact joint transform correlator with a thick photorefractive crystal.

F T Yu, S Wu, S Rajan

    Applied Optics
    |August 21, 2010
    PubMed
    Summary

    A joint transform correlator using a thick photorefractive crystal showed limited performance due to Bragg diffraction. A Galilean telescopic beam compression technique was employed to overcome this limitation in optical correlation.

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    Area of Science:

    • Optics and Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Joint transform correlators (JTCs) are widely used for pattern recognition.
    • Thick photorefractive crystals are advantageous for JTCs due to high diffraction efficiency.
    • Bragg diffraction effects in thick crystals can degrade JTC performance.

    Purpose of the Study:

    • To investigate the impact of Bragg diffraction on JTC performance with thick photorefractive crystals.
    • To propose and evaluate a method to mitigate Bragg limitations in JTCs.

    Main Methods:

    • A compact joint transform correlator setup was designed using a thick photorefractive crystal.
    • Bragg diffraction effects were analyzed theoretically and experimentally.
    • A Galilean telescopic beam compression technique was integrated into the JTC.

    Main Results:

    • Bragg diffraction was confirmed to severely limit correlation performance in thick crystal JTCs.
    • The Galilean telescopic beam compression technique effectively relaxed the Bragg limitation.
    • Improved correlation performance was observed after implementing the beam compression technique.

    Conclusions:

    • Bragg diffraction is a critical factor affecting JTC performance with thick crystals.
    • The Galilean telescopic beam compression technique offers a viable solution to enhance JTCs.
    • This approach enables more robust optical correlation using thick photorefractive materials.