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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Updated: Mar 3, 2026

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

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Phase shifting by wavelength modulation in a cube beam splitter interferometer.

Uriel Rivera-Ortega

|April 22, 2017

Summary

This summary is machine-generated.

This study presents a low-cost, automated phase-shifting interferometry system using a tunable laser diode and a common-path interferometer. The system achieves automated phase map generation for enhanced optical metrology.

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Area of Science:

Optical Metrology
Interferometry
Laser Technology

Background:

Phase-shifting interferometry (PSI) is crucial for precise optical measurements.
Traditional PSI setups can be complex and costly.
Automating PSI enhances efficiency and accessibility.

Purpose of the Study:

To develop a low-cost, fully automated phase-shifting interferometry system.
To implement a common-path interferometric setup using a tunable laser diode.
To validate the system's performance using the Carré algorithm.

Main Methods:

Utilized a cube beam splitter interferometer configured as a two-window common-path setup.
Employed a data acquisition device to control laser diode voltage and thus wavelength.
Integrated LabVIEW and MATLAB for automation, control, and data analysis.
Applied the Carré algorithm for phase map generation.

Main Results:

Successfully demonstrated a low-cost and fully automated PSI process.
Generated phase maps using the Carré algorithm with a tunable laser diode.
Verified system performance through measurements of visibility and phase shift.

Conclusions:

The presented automated PSI system offers a cost-effective solution for optical metrology.
Continuous wavelength tuning of laser diodes enables efficient phase shifting.
The common-path setup enhances stability and simplifies the interferometric system.