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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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High accuracy laser Doppler velocimeter using stable long-wavelength semiconductor lasers.

H W Mocker, P E Bjork

    Applied Optics
    |June 18, 2010
    PubMed
    Summary

    We developed a compact, eye-safe Doppler velocimeter using stabilized InGaAsP laser diodes. This system achieves sub-centimeter per second velocity resolution over 100 meters, ideal for remote sensing applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Remote Sensing

    Background:

    • Compact and miniaturized Doppler velocimeters are crucial for remote velocity sensing.
    • Existing systems may face limitations in size, safety, or resolution.

    Purpose of the Study:

    • To develop an eye-safe Doppler velocimeter with high velocity resolution.
    • To utilize compact InGaAsP laser diodes for improved system design.

    Main Methods:

    • Employed external cavity stabilization techniques to reduce the linewidth of InGaAsP laser diodes.
    • Integrated the stabilized diodes into an eye-safe Doppler velocimeter system operating at 1.54 micrometers.

    Main Results:

    • Achieved a diode linewidth of approximately 40 kHz.
    • Demonstrated a velocity resolution of sub-centimeter per second.
    • Validated performance over a distance of 100 meters.

    Conclusions:

    • The developed eye-safe Doppler velocimeter meets the requirements for compact and miniaturized remote sensing.
    • External cavity stabilization effectively enhances laser diode performance for high-resolution velocity measurements.