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Measuring very low optical powers with a common camera.

Silviu T Popescu, Petronela S Gheorghe, Adrian Petris

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    Summary
    This summary is machine-generated.

    We present a method to calibrate a commercial camera for sensitive optical power measurements down to the femtowatt level. This technique enables cameras to function as precise optical power meters, even at extremely low light levels.

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    Area of Science:

    • Optics and Photonics
    • Instrumentation and Measurement

    Background:

    • Accurate optical power measurement is crucial in various scientific and technological fields.
    • Traditional optical power meters can be expensive and specialized.
    • Developing cost-effective and sensitive alternatives is highly desirable.

    Purpose of the Study:

    • To introduce a calibration procedure for inexpensive commercial cameras.
    • To enable cameras to function as sensitive optical power meters.
    • To achieve measurements at the femtowatt level.

    Main Methods:

    • Calibration of a commercial camera for optical power measurements.
    • Implementation of a windowing technique (region of interest) to optimize signal-to-noise ratio.
    • Adjustment of camera exposure time to extend the detection limit.

    Main Results:

    • Demonstrated camera's capability as a sensitive optical power meter.
    • Achieved measurement of optical powers down to the femtowatt (fW) level.
    • Successfully measured 25 fW using a common complementary metal-oxide-semiconductor camera.

    Conclusions:

    • A cost-effective calibration procedure transforms commercial cameras into femtowatt-level optical power meters.
    • The windowing technique and exposure time adjustments are key to maintaining sensitivity and accuracy.
    • This method offers a practical and accessible solution for low-power optical measurements.