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Two-dimensional spatial imaging based on acoustooptical deflectors.

M C Yappert, S M Kimbrell, E S Yeung

    Applied Optics
    |May 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

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    This study introduces a laser scanning method using acousto-optical deflectors to map atomic and molecular plumes. This technique enables real-time visualization of laser vaporization processes without mechanical parts.

    Area of Science:

    • Laser-induced breakdown spectroscopy
    • Surface science
    • Atomic and molecular physics

    Background:

    • Laser vaporization is crucial for material processing and analysis.
    • Understanding plume dynamics is essential for optimizing these processes.
    • Current methods for plume analysis can be limited in speed and spatial resolution.

    Purpose of the Study:

    • To develop a rapid, non-mechanical method for two-dimensional laser beam scanning.
    • To monitor the temporal and spatial evolution of plumes generated by laser vaporization.
    • To create concentration maps of specific species within the plume.

    Main Methods:

    • Utilized two orthogonal acousto-optical deflectors for two-dimensional laser beam scanning.
    • Achieved a complete scan in 50 microseconds with a spatial resolution of 20 x 125 spots.

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  • Employed absorption spectroscopy to monitor sodium (Na) atoms and lead dimer (Pb2) molecules.
  • Implemented a dual-channel transient digitizer for normalization against laser intensity fluctuations.

    • Main Results:

    • Successfully demonstrated two-dimensional plume scanning without mechanical components.
    • Obtained time-resolved concentration maps of Na atoms and Pb2 dimers within the plume.
    • Normalized data effectively corrected for variations in laser power and deflection efficiency.

    Conclusions:

    • The acousto-optical deflection system provides a fast and precise method for plume analysis.
    • This technique allows for detailed investigation of laser vaporization plume development.
    • The method is suitable for studying the dynamics of various atomic and molecular species.