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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
IR Frequency Region: X–H Stretching01:24

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Related Experiment Video

Updated: Jun 8, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Extending the unambiguous range of two-color interferometers.

P J de Groot

    Applied Optics
    |October 12, 2010
    PubMed
    Summary

    Two-color interferometry

    Area of Science:

    • Optics and Photonics
    • Metrology

    Background:

    • Two-color interferometry uses multiple wavelengths to measure distances.
    • The unambiguous range is typically limited by the synthetic wavelength.

    Purpose of the Study:

    • To extend the unambiguous distance measurement range in two-color interferometry.
    • To overcome limitations imposed by the synthetic wavelength.

    Main Methods:

    • Utilizing optical phase information.
    • Determining the synthetic-wavelength fringe order.

    Main Results:

    • Demonstrated extension of the unambiguous measurement range beyond the synthetic wavelength limit.
    • Successfully employed optical phase data for fringe order determination.

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    Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
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    Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

    Published on: December 9, 2013

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    Last Updated: Jun 8, 2026

    A Multimodal Wide-Field Fourier-Transform Raman Microscope
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    A Multimodal Wide-Field Fourier-Transform Raman Microscope

    Published on: December 30, 2025

    Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
    12:51

    Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

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    Conclusions:

    • The unambiguous range in two-color interferometry can be significantly extended.
    • Optical phase information is key to overcoming traditional measurement limitations.