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Related Experiment Video

Updated: Jun 15, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

Optical phase measurement in real time.

L M Frantz, A A Sawchuk, W von der Ohe

    Applied Optics
    |March 11, 2010
    PubMed
    Summary

    A new real-time optical phase measurement technique uses interferometry with a photodetector array. This method enables rapid calculation of phase and magnitude, crucial for optical computing applications like Fourier transforms.

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    Area of Science:

    • Optics and Photonics
    • Optical Metrology
    • Computational Imaging

    Background:

    • Accurate real-time measurement of optical phase is essential for advanced optical systems.
    • Existing phase measurement techniques can be complex or lack speed.
    • Interferometric methods offer a promising avenue for precise phase retrieval.

    Purpose of the Study:

    • To develop a novel method for the real-time measurement of optical phase.
    • To demonstrate the application of this method in hybrid optical-digital analog computation of 2-D Fourier transforms.
    • To validate the technique through experimental results.

    Main Methods:

    • Interfering the target optical wave with a spatially coherent plane-wave reference beam.
    • Measuring irradiance simultaneously across a photodetector array for three reference phase shifts.
    • Calculating phase and magnitude at each array element using a simple algorithm.

    Main Results:

    • Successful real-time measurement of optical phase and magnitude at each photodetector element.
    • Demonstration of the method's utility in computing 2-D Fourier transforms.
    • Experimental validation of the hybrid optical-digital analog computation approach.

    Conclusions:

    • The developed method provides an efficient and accurate means for real-time optical phase measurement.
    • This technique is well-suited for applications in optical computing, particularly for 2-D Fourier transforms.
    • The experimental results confirm the viability and effectiveness of the proposed interferometric phase measurement approach.

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