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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters

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Published on: June 2, 2010

Complete modal decomposition for optical fibers using CGH-based correlation filters.

Thomas Kaiser¹, Daniel Flamm, Siegmund Schröter

¹Institute of Applied Physics, Friedrich-Schiller-University Jena, D-07743 Jena. Thomas.Kaiser.1@uni-jena.de

|May 26, 2009

Summary

This study introduces a novel experimental method using computer-generated holographic filters for complete optical field decomposition. This technique simplifies beam characterization, even for complex fields with singularities.

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Area of Science:

Optics and Photonics
Quantum Optics
Information Optics

Background:

Describing optical fields via eigenmodes is intuitive for beam characterization.
Existing experimental methods lack unambiguous phase structure characterization, especially for singularities.
Numerical phase-retrieval methods are common but can be complex.

Purpose of the Study:

To present a novel, purely experimental method for complete optical field modal decomposition.
To overcome limitations in characterizing optical field phase structures, including singularities.
To enable simple and unambiguous beam characterization.

Main Methods:

Utilizing computer-generated holographic filters for modal decomposition.
Experimental reconstruction of various optical fields.
Application to fields emerging from weakly multi-mode fibers (V ≈ 5).

Main Results:

Demonstrated complete modal decomposition of complex optical fields.
Successfully reconstructed fields with arbitrary mode content from a weakly multi-mode fiber.
Validated the method's suitability for fields containing phase singularities.

Conclusions:

The computer-generated holographic filter method offers mathematical uniqueness and experimental simplicity.
This technique is a promising approach for real-time beam characterization.
The method is effective even for singular optical beam profiles.