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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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Related Experiment Video

Updated: Jul 7, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

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Published on: August 12, 2013

Optical pulse distance-multiplying interferometry.

A M Chekhovsky, A N Golubev, M V Gorbunkov

    Applied Optics
    |February 15, 2008
    PubMed
    Summary

    Researchers explored creating long baselines for distance calibration using a novel interferometric method. This technique utilizes ultrashort laser pulses and wideband continuum radiation, achieving high-precision measurements with stable achromatic fringes.

    Area of Science:

    • Optics and Photonics
    • Metrology
    • Laser Physics

    Background:

    • Traditional distance-measuring interferometry often uses continuous wave (cw) radiation.
    • Limitations exist in achieving long baselines and high precision with existing methods.
    • Calibration of distance-measuring apparatus requires robust and accurate techniques.

    Purpose of the Study:

    • To investigate the feasibility of generating long baselines using a distance-multiplying interferometric method.
    • To propose and experimentally validate the use of wideband picosecond continuum radiation for enhanced interferometry.
    • To demonstrate a novel approach for high-precision distance measurements in calibration apparatus.

    Main Methods:

    • Utilized a distance-multiplying interferometric method.

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  • Employed wideband picosecond continuum radiation generated by powerful ultrashort laser pulses.
  • Observed interference patterns and analyzed achromatic fringe stability.

    • Main Results:

    • Successfully generated an interference pattern characteristic of white light.
    • Observed a stable achromatic fringe, confirming the method's viability.
    • Demonstrated the potential for measurement errors less than a wavelength of light.

    Conclusions:

    • The proposed method using ultrashort laser pulses and continuum radiation is effective for creating long baselines.
    • The stable achromatic fringe confirms the high precision achievable with this technique.
    • A pulse interferometer design free from atmospheric fluctuations for single-stage baseline creation is feasible.