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Related Experiment Videos

Phase-shifting (Sagnac) interferometer with external phase control.

José A Ferrari1, Eugenio Garbusi

  • 1Instituto de Física, Facultad de Ingeniería, Montevideo, Uruguay.

Applied Optics
|July 29, 2005
PubMed
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A new polarization ring interferometer uses orthogonal polarizations for phase-shifting interferometry. External control via a Pockels cell enables fast phase modulation without internal moving parts.

Area of Science:

  • Optics and Photonics
  • Interferometry
  • Optical Engineering

Background:

  • Phase-shifting interferometry (PSI) is crucial for precise optical metrology.
  • Traditional PSI often requires mechanical components for phase shifting, limiting speed and reliability.
  • Controlling phase shifts externally offers advantages in speed and stability.

Purpose of the Study:

  • To introduce a novel ring interferometer configuration for phase-shifting applications.
  • To demonstrate external phase-shifting control using a Pockels cell.
  • To enable fast and reliable phase modulation in interferometric systems.

Main Methods:

  • A polarization (ring) interferometer design is presented.
  • Orthogonal linear polarizations are utilized to represent counterpropagating paths within the ring.

Related Experiment Videos

  • A Pockels cell is employed for external, real-time control of the phase shift.

    • Main Results:

    • The proposed configuration successfully implements phase-shifting interferometry.
    • External phase control via a Pockels cell allows for rapid modulation.
    • The design eliminates the need for internal moving parts, enhancing stability.

    Conclusions:

    • The novel ring configuration offers an effective method for phase-shifting interferometry.
    • External phase control provides a significant advantage for high-speed and robust measurements.
    • This approach advances the development of advanced optical metrology instrumentation.