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Related Experiment Video

Updated: Jul 9, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Closed-loop phase-shifting interferometry with a laser diode.

T Yoshino, H Yamaguchi

    Optics Letters
    |December 20, 2007
    PubMed
    Summary
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    A novel phase-shifting Fizeau interferometer was developed using laser diode frequency modulation. This system offers stable, closed-loop phase control for precise optical measurements.

    Area of Science:

    • Optical Engineering
    • Metrology
    • Interferometry

    Background:

    • Fizeau-type interferometers are crucial for high-precision optical surface measurements.
    • Traditional interferometers face challenges with environmental disturbances and laser stability.
    • Phase-shifting techniques enhance measurement accuracy but require stable control.

    Purpose of the Study:

    • To construct a closed-loop phase-shifting Fizeau interferometer.
    • To implement direct frequency modulation of laser diodes for phase control.
    • To achieve stable and precise optical phase measurements.

    Main Methods:

    • Utilized a Fizeau-type interferometer configuration.
    • Employed direct frequency modulation of laser diodes at lambda=633 nm.

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    Last Updated: Jul 9, 2026

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    Published on: January 28, 2019

    The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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  • Implemented a servo control system in the phase domain.
  • Used a two-frequency optical heterodyne method for optical phase detection.
  • Achieved stepwise phase shifting.

    • Main Results:

    • Successfully constructed a closed-loop phase-shifting Fizeau interferometer.
    • Demonstrated servo control in the phase domain for stable optical phase detection.
    • Achieved good stabilization against vibrations, airflow, and laser frequency fluctuations.
    • Validated the effectiveness of direct frequency modulation for phase control.

    Conclusions:

    • The developed interferometer provides a stable and precise platform for optical metrology.
    • Direct frequency modulation of laser diodes is an effective method for closed-loop phase control in interferometry.
    • The system shows robustness against common environmental and laser instabilities.