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Related Concept Videos

Potentiometer01:30

Potentiometer

Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Computer-controllable wedged-plate optical variable attenuator.

K Bennett, R L Byer

    Applied Optics
    |March 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new computer-controlled variable optical attenuator offers a wide dynamic range and spectral range, suitable for high-power laser applications. This device utilizes Fresnel transmission for precise light control.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Optical Engineering

    Background:

    • High-power laser systems require precise control over optical intensity.
    • Existing optical attenuators may have limitations in dynamic range, spectral coverage, or power handling.
    • Variable optical attenuators are crucial components in laser-based research and industrial applications.

    Purpose of the Study:

    • To develop and test a novel computer-controllable variable optical attenuator.
    • To achieve a wide dynamic range and spectral range suitable for high peak and average power laser sources.
    • To demonstrate the performance characteristics of the developed optical attenuator.

    Main Methods:

    • The optical attenuator is designed based on Fresnel transmission principles.
    • The device employs two pairs of precisely wedged plates for optical attenuation.
    • Computer control is integrated for variable attenuation adjustment.

    Main Results:

    • A dynamic range of 35 dB was achieved.
    • Insertion loss was demonstrated to be as low as 1%.
    • Precision better than 1% was obtained, with beam offset and deflection below 0.5 mm and 0.5 mrad, respectively.

    Conclusions:

    • The developed variable optical attenuator meets the requirements for high-power laser applications.
    • The device offers excellent performance in terms of dynamic range, spectral range, precision, and beam stability.
    • This technology provides a valuable tool for precise optical intensity control in demanding laser systems.