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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.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Published on: October 11, 2016

Harmonically-related diffraction gratings-based interferometer for quadrature phase measurements.

Zahid Yaqoob, Jigang Wu, Xiquan Cui

    Optics Express
    |June 17, 2009
    PubMed
    Summary

    We demonstrate how two shallow diffraction gratings can create precise phase shifts for quadrature phase interferometry. This grating-pair method allows for adjustable phase control in interferometers, outperforming single gratings.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Diffraction Gratings

    Background:

    • Michelson interferometers typically provide limited phase shifts (0° or 180°) between output ports.
    • Achieving specific phase shifts, like 90° for quadrature phase interferometry, is crucial for advanced optical measurements.
    • Shallow diffraction gratings offer a novel approach to manipulating light phase.

    Purpose of the Study:

    • To demonstrate the use of shallow diffraction gratings for quadrature phase interferometry.
    • To show how a pair of gratings can achieve controllable phase shifts.
    • To investigate phase shift adjustment by grating shearing.

    Main Methods:

    • Utilizing a modified Michelson interferometer setup.
    • Employing a combination of two parallel, shallow diffraction gratings.
    • Adjusting the phase shifts by shearing the gratings relative to each other.

    Main Results:

    • A single shallow diffraction grating yields only trivial phase shifts.
    • A pair of parallel shallow diffraction gratings enables desired phase shifts, such as 90°.
    • Experimental results confirm good agreement with theoretical predictions for phase shift control.

    Conclusions:

    • Shallow diffraction gratings, particularly in pairs, are effective for achieving controlled phase shifts in interferometry.
    • Grating shearing provides a method for tuning the phase at interferometer output ports.
    • This technique advances the development of quadrature phase interferometry systems.