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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Related Experiment Video

Updated: Jun 9, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

Time-delay Fizeau phase-conjugate interferometer.

G Yang, A Siahmakoun

|September 8, 2010

Summary

This summary is machine-generated.

This study introduces a novel time-delay Fizeau phase-conjugate interferometer using a barium titanate (BaTiO3) crystal. This method enables real-time holographic memory and interferogram generation with enhanced accuracy, simplifying holographic interferometry.

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Last Updated: Jun 9, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

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Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

Optics and Photonics
Holography
Interferometry

Background:

Conventional holographic interferometry often requires complex setups and darkroom processing.
Photorefractive crystals offer unique properties for optical data storage and manipulation.

Purpose of the Study:

To develop a simplified and accurate time-delay Fizeau phase-conjugate interferometer.
To utilize the slow response time of barium titanate (BaTiO3) for holographic memory and real-time interferometry.

Main Methods:

Construction of a Fizeau phase-conjugate interferometer using a BaTiO3 crystal in a degenerate four-wave-mixing configuration.
Sequential storage of an optical wave and its time-delayed version within the crystal.
Simultaneous generation of phase-conjugate waves and their superposition to create an interferogram.

Main Results:

Demonstration of a phase-conjugate mirror functioning as a holographic memory.
Generation of interferograms resulting from the superposition of phase-conjugate waves.
Achieved real-time operation, eliminating the need for darkroom processing and repositioning procedures.

Conclusions:

The developed time-delay Fizeau phase-conjugate interferometer offers a simpler and more accurate alternative to conventional holographic interferometry.
The use of photorefractive BaTiO3 crystals facilitates real-time holographic data storage and interferogram generation.
This technique holds potential for various applications requiring precise optical measurements and analysis.