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Phase-extraction algorithm in laser-diode phase-shifting interferometry.
Optics Letters
|October 29, 2009
Summary
This study presents a novel phase-shifting interferometer using a laser diode, demonstrating insensitivity to laser power fluctuations. A new algorithm accurately measures phase, showing good agreement with experimental results and reducing systematic errors.
Area of Science:
- Optical engineering
- Interferometry
- Laser technology
Background:
- Laser power variations can introduce systematic errors in phase-shifting interferometry.
- Accurate phase measurement is crucial for various optical applications.
Purpose of the Study:
- To develop a phase-shifting interferometer insensitive to laser power fluctuations.
- To introduce and validate a new phase-extraction algorithm for improved accuracy.
Main Methods:
- Utilized a laser diode-based phase-shifting interferometer.
- Employed a novel phase-extraction algorithm analyzing six interferograms.
- Calculated phase using a least-squares fit.
- Numerically investigated systematic phase errors due to laser output variations.
Main Results:
- The developed interferometer demonstrated insensitivity to laser power changes.
- The new algorithm accurately measured the tested phase.
- Numerical investigation showed good agreement with experimental results for the conventional algorithm, with errors exhibiting 2pi periodicity.
Conclusions:
- The novel phase-extraction algorithm effectively mitigates systematic phase errors caused by laser power variations.
- The developed interferometer offers a robust solution for precise phase measurements in the presence of fluctuating laser output.
