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

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Contribution to the Improvement of the Correlation Filter Method for Modal Analysis with a Spatial Light Modulator.

David Benedicto¹, María Victoria Collados¹, Juan C Martín¹

¹Departamento de Física Aplicada, Instituto de Investigación en Ingeniería de Aragón (I3A), Facultad de Ciencias, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.

|November 24, 2022

Summary

This study presents optimized procedures for modal decomposition of light using computer-generated holograms. These methods enhance accuracy in analyzing light propagation in optical fibers and photonic devices.

Keywords:

computer generated hologram correlation filter method double phase method modal decomposition modal division multiplexing multimode fibers spatial light modulator

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Area of Science:

Optics and Photonics
Waveguide Theory
Computational Physics

Background:

Modal decomposition is crucial for understanding light propagation in waveguides and photonic devices.
Computer-generated holograms (CGHs) acting as match filters in spatial light modulators (SLMs) offer a method for modal analysis.

Purpose of the Study:

To present optimized operational procedures for CGH-based modal decomposition.
To enhance the accuracy and robustness of modal analysis in optical systems.

Main Methods:

Developing a filter size adjustment method based on standard fiber LP-mode symmetry.
Investigating the impact of mode normalization on noise in complex amplitude encoding.
Proposing a robust technique for measuring the phase difference between optical modes.

Main Results:

Demonstrated effective filter size adjustment for improved modal decomposition.
Quantified the influence of mode normalization on encoding-inherent noise.
Successfully tested wavefront reconstruction in a few-mode fiber using the proposed procedures.

Conclusions:

The presented procedures offer practical guidelines for maximizing the effectiveness of CGH-based modal decomposition.
The study provides a robust framework for accurate modal analysis and phase difference measurement in optical fibers.