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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Binary encoded computer generated holograms for temporal phase shifting.

Angela Amphawan1

  • 1InterNetWorks Research Group, School of Computing, Universiti Utara Malaysia, 06010 Sintok, Kedah, Malaysia. a.amphawan@seh.oxon.org

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|November 24, 2011
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Summary

This study introduces new binary encoded computer-generated holograms (CGHs) for faster real-time interferometry. This method significantly reduces processing time, making it ideal for portable optical applications.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Holography

Background:

  • Real-time optical applications require rapid processing of computer-generated holograms (CGHs) for accurate interferometry.
  • Existing methods face challenges with rapid phase changes, potentially compromising system input and performance.
  • Computational power constraints in portable devices necessitate efficient hologram processing techniques.

Purpose of the Study:

  • To design and implement a set of binary encoded CGHs for real-time five-frame temporal phase shifting interferometry.
  • To enable real-time measurement of electric field phase for selective launch in multimode fiber.
  • To enhance processing speed for applications using binary amplitude spatial light modulators.

Main Methods:

  • Development of a novel set of binary encoded CGHs.
  • Integration with a binary amplitude spatial light modulator for real-time phase shifting interferometry.
  • Application of the technique to measure the phase of the generated electric field in multimode fiber.

Main Results:

  • Achieved a processing time reduction of up to 65% compared to the original encoding scheme.
  • Demonstrated successful real-time measurement of electric field phase for selective launch.
  • Experimental results showed good agreement with traditional phase shifting methods using a piezo-driven mirror.

Conclusions:

  • The proposed binary encoded CGHs offer a significant speed improvement for real-time interferometry.
  • This technique is suitable for portable devices with limited computational resources.
  • The method provides accurate phase measurements, comparable to established interferometric techniques.