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Scanned laser infrared microscope.

B Sherman, J F Black

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new scanning laser infrared (IR) microscope detects internal material flaws using IR transmittance. This advanced imaging technique visualizes microscopic defects in materials, enhancing quality control and material science research.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Non-Destructive Testing

    Background:

    • Internal material irregularities and foreign inclusions affect infrared (IR) transmittance.
    • Detecting these defects is crucial for material quality assessment.

    Purpose of the Study:

    • To construct and demonstrate a scanning laser IR microscope for detecting material internal irregularities.
    • To visualize IR transmittance variations caused by defects.
    • To apply the microscope for examining semiconductor materials.

    Main Methods:

    • A scanning laser IR microscope was developed using a 3.39-micrometer He-Ne laser as the IR source.
    • The microscope produces a shadowgraph image of IR transmittance on an oscilloscope display.
    • A raster scan of 400 lines completed in 1 second, using an indium arsenide photovoltaic cell detector.

    Main Results:

    • The microscope successfully generated shadowgraph images revealing IR transmittance variations.
    • Defects such as internal irregularities and foreign material inclusions were detected.
    • Applications demonstrated effective defect visualization in semiconductor materials.

    Conclusions:

    • The scanning laser IR microscope is an effective tool for detecting internal material flaws.
    • The system provides a rapid and sensitive method for non-destructive material examination.
    • This technique offers valuable insights for quality control in materials science, particularly for semiconductors.