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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...
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Related Experiment Video

Updated: Apr 3, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Determining optical path difference with a frequency-modulated continuous-wave method.

Ningfang Song, Xiangxiang Lu, Wei Li

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    |September 15, 2015
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    Summary
    This summary is machine-generated.

    This study introduces a frequency-modulated continuous-wave method to measure optical path difference (OPD) in Raman lasers. This technique effectively minimizes diode laser phase noise by precisely tuning the OPD, enhancing laser system performance.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Spectroscopy

    Background:

    • Diode laser phase noise can significantly impact Raman laser systems.
    • Accurate measurement and adjustment of optical path difference (OPD) are crucial for mitigating these noise effects.
    • Existing methods for OPD determination may be complex or time-consuming.

    Purpose of the Study:

    • To investigate a frequency-modulated continuous-wave (FMCW) method for determining the optical path difference (OPD) between two Raman beams.
    • To demonstrate the utility of FMCW in facilitating OPD measurement and adjustment.
    • To minimize the impact of diode laser phase noise on Raman laser performance.

    Main Methods:

    • Utilized a frequency-modulated continuous-wave (FMCW) technique.
    • Investigated the relationship between beat note frequencies and varying optical path differences (OPDs).
    • Characterized and analyzed beat note frequencies for different OPDs to establish a zero-OPD condition.

    Main Results:

    • Successfully demonstrated the FMCW method for OPD determination in Raman beams.
    • Identified a specific beat frequency (0.367 Hz) corresponding to zero OPD.
    • Measured the reduction in phase noise of the Raman laser system after implementing zero OPD.

    Conclusions:

    • The FMCW method provides an effective and efficient means for measuring and adjusting OPD in Raman laser systems.
    • Minimizing OPD using this technique significantly reduces the detrimental effects of diode laser phase noise.
    • This advancement contributes to improved stability and performance of Raman laser applications.