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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Thermally induced waveguide changes in active fibers.

Florian Jansen¹, Fabian Stutzki, Hans-Jürgen Otto

¹Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany. jansen@iap.uni-jena.de

|March 16, 2012

Summary

High-power fiber lasers experience thermally induced waveguide changes, reducing mode-field diameter and improving beam quality. This study systematically characterizes these changes, revealing a core-size-dependent behavior independent of fiber design.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

High-power fiber lasers are crucial for various applications.
Thermally induced waveguide changes can affect laser performance.
Understanding these changes is essential for optimizing laser design and operation.

Purpose of the Study:

To systematically characterize the reduction of mode-field diameter in large mode area fibers under high-power operation.
To investigate the influence of fiber design and core size on thermally induced waveguide changes.
To experimentally estimate the strength of the refractive index change and demonstrate its application in overcoming avoided crossings.

Main Methods:

Experimental characterization of mode-field diameter reduction in various large mode area fibers.
High-power laser operation to induce thermal effects.
Analysis of mode-field diameter behavior as a function of core size and fiber design.
Experimental estimation of refractive index change strength.

Main Results:

Thermally induced waveguide changes significantly impact large mode area fibers.
Mode-field diameter reduction was observed, correlating with core size but independent of fiber design.
The strength of the refractive index change was experimentally estimated.
The application of these index changes to overcome avoided crossings was successfully demonstrated.

Conclusions:

The reduction in mode-field diameter in large mode area fibers under high-power operation exhibits predictable behavior based on core size.
The refractive index change induced by thermal effects can be leveraged to manage waveguide properties and overcome optical phenomena like avoided crossings.