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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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Related Experiment Video

Updated: Jun 17, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Nonlinear optical properties ofBaAlBO3F2 crystal.

Yong Zhou1, Yinchao Yue, Jianuo Wang

  • 1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190, China. yong_zhou@yeah.net

Optics Express
|December 10, 2009
PubMed
Summary

The new barium aluminum borate fluoride (BaAlBO3F2 or BABF) crystal shows promise as a nonlinear optical material for UV light generation. Researchers achieved a 49.0% conversion efficiency for 1064 nm to 532 nm light, demonstrating its potential.

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

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Area of Science:

  • Materials Science
  • Optics and Photonics

Background:

  • Nonlinear optical (NLO) materials are crucial for frequency conversion in lasers.
  • Barium aluminum borate fluoride (BaAlBO3F2 or BABF) is a newly investigated crystal with potential NLO applications.

Purpose of the Study:

  • To investigate the nonlinear optical properties of the novel BaAlBO3F2 (BABF) crystal.
  • To evaluate BABF's suitability for ultraviolet (UV) light generation.

Main Methods:

  • Characterization of refractive index dispersion curves.
  • Measurement of optical conversion efficiency for second-harmonic generation (SHG).
  • Determination of external angular acceptance bandwidth for SHG and third-harmonic generation (THG).

Main Results:

  • High-quality, nonhygroscopic BABF crystal with moderate birefringence was obtained.
  • A maximum optical conversion efficiency of 49.0% was achieved for 1064 nm to 532 nm light.
  • The external angular acceptance bandwidth for SHG and THG was measured for 1064 nm pump light.

Conclusions:

  • BABF crystal exhibits significant potential as a nonlinear optical material, particularly for UV light generation at 355 nm.
  • The achieved conversion efficiency highlights BABF's suitability for practical NLO applications.