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

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Virtual interferogram-generation algorithm for robust complex amplitude measurement using two interferograms.

Jin Nozawa, Atsushi Okamoto, Kazuhisa Ogawa

|November 10, 2016

Summary

This study introduces a new virtual interferogram-generation algorithm for accurate complex amplitude measurement, even with varying beam intensities and non-ideal phase shifts. The method enhances precision by reducing calculation errors in optical measurements.

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Area of Science:

Optical Physics
Interferometry
Holography

Background:

Accurate measurement of complex amplitude is crucial in optical metrology.
Conventional interferometric algorithms face limitations with intensity mismatches and non-ideal phase shifts.

Purpose of the Study:

To develop a novel virtual interferogram-generation algorithm for precise complex amplitude measurement.
To overcome limitations of existing methods regarding intensity differences and phase shift variations.

Main Methods:

A virtual interferogram-generation algorithm is proposed, utilizing two interferograms.
The method involves generating two phase-shifted holograms computationally.
It captures intensities of signal beams, reference beams, and interferograms.

Main Results:

The algorithm accurately measures complex amplitude, even when signal beam intensity exceeds reference beam intensity.
It enables computation with phase shifts not equal to π/2.
Calculation errors due to intensity differences are significantly suppressed.

Conclusions:

The proposed algorithm offers a robust solution for complex amplitude measurement in interferometry.
It provides flexibility in choosing phase shifts and enhances accuracy under challenging intensity conditions.
This advancement improves the reliability of optical measurement techniques.