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Near Simultaneous Laser Scanning Confocal and Atomic Force Microscopy (Conpokal) on Live Cells
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A high resolution scanning confocal interferometer.

J R Johnson

    Applied Optics
    |January 14, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Confocal cavities, despite extra reflections, maintain etalon resolving power. This study clarifies free spectral range and details a 15-cm confocal interferometer achieving high resolution.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Cavity Physics

    Background:

    • Confocal cavities offer unique optical properties.
    • Traditional Fabry-Perot interferometers have limitations in certain applications.
    • Understanding illumination requirements is crucial for optimizing cavity performance.

    Purpose of the Study:

    • Investigate illumination requirements for confocal cavities.
    • Assess the impact of additional reflections on resolving power.
    • Clarify and revise the concept of free spectral range.

    Main Methods:

    • Quasi-paraxial ray tracing calculations.
    • Analysis of reflection effects in confocal versus Fabry-Perot interferometers.
    • Construction and performance testing of a 15-cm confocal interferometer.

    Main Results:

    • Additional reflections in confocal cavities do not degrade resolving power.
    • Established the need for a revised definition of free spectral range.
    • Achieved a finesse of 333 with a 1 GHz free spectral range.

    Conclusions:

    • Confocal cavities are viable for high-resolution applications.
    • The proposed revision of free spectral range enhances clarity.
    • The 15-cm confocal interferometer demonstrates excellent performance with a resolving power of 1.58 x 10(8).