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Related Concept Videos

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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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...
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Related Experiment Video

Updated: Dec 25, 2025

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Void-free bonding for a large slab laser crystal.

Yan-Yong Lin, Hong-Wei Gao, Zhong-Zheng Chen

    Applied Optics
    |April 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel void-free bonding technique for large neodymium-doped, yttrium aluminum garnet (Nd:YAG) laser crystals. This advancement enables higher output power from single-slab crystal lasers.

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    Area of Science:

    • Materials Science
    • Laser Physics
    • Optical Engineering

    Background:

    • Achieving void-free bonding in large laser crystal slabs is critical for high-power laser performance.
    • Indium-oxide barriers and poor solderability have historically limited the size and efficiency of bonded laser components.

    Purpose of the Study:

    • To demonstrate a void-free bonding technique for large-area neodymium-doped, yttrium aluminum garnet (Nd:YAG) crystal slabs.
    • To overcome challenges associated with indium-oxide barriers and enhance solderability for improved laser performance.

    Main Methods:

    • Utilized a novel fluxless oxide layer removal technology to address the indium-oxide barrier problem.
    • Employed electrochemical-polished indium solder and plasma-cleaned heat sinks to enhance solderability, reducing contact angle.
    • Bonded a large Nd:YAG slab (∼160mm×70mm) using the developed technique.

    Main Results:

    • Successfully demonstrated void-free bonding on the largest laser slab to date.
    • Achieved a maximum output power of 7.3 kW from a single-slab laser, with 57% optical-to-optical efficiency and 67.8% slope conversion.
    • Measured RMS wavefront distortion of 0.192λ before and 0.434λ after bonding (λ=633nm).

    Conclusions:

    • The developed void-free bonding technique is effective for large laser slabs.
    • This method significantly enhances output power and efficiency in single-slab crystal lasers.
    • Represents a breakthrough in large-scale laser crystal bonding and high-power laser development.