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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

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Wave propagation in a graded-index taper.

D Bertilone, A Ankiewicz, C Pask

|May 22, 2010

Summary

We developed a simple model for graded-index tapers, providing accurate field solutions that clearly show tapering effects. This model links ray and field optics for better physical understanding.

Area of Science:

Optics and Photonics
Electromagnetism

Background:

Graded-index optical elements are crucial for beam manipulation.
Accurate modeling of tapered structures is essential for device design.

Purpose of the Study:

To present a novel model for graded-index tapers.
To derive simple and accurate field solutions.
To elucidate the impact of tapering on optical fields.

Main Methods:

Developed a model solvable by separation of variables.
Derived analytical expressions for field solutions.
Compared results with geometrical optics analysis.

Main Results:

Obtained accurate and simple field solutions for graded-index tapers.

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Demonstrated clear illustration of tapering influence on fields.

Established a link between ray and field optics approaches.

Conclusions:

The proposed model offers a direct and insightful method for analyzing graded-index tapers.
The simple expressions facilitate physical interpretation of tapering effects.
The model's utility is shown through application examples.