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Extending single mode performance of all-solid large-mode-area single trench fiber
Optics Express
|January 22, 2015
Summary
A novel single trench fiber design enables larger mode areas for compact fiber lasers. This design enhances single-mode operation and suppresses unwanted modes, offering a cost-effective solution for laser applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Scaling the mode area of the fundamental mode is crucial for developing high-power fiber lasers.
- Achieving effective single-mode operation in large-mode-area fibers remains a challenge.
Purpose of the Study:
- To introduce and characterize a novel "single trench fiber" design for enhanced single-mode operation.
- To demonstrate mode area scaling for compact fiber laser devices.
Main Methods:
- Fabrication of a Yb-doped single trench fiber using modified chemical vapor deposition and solution-doping.
- Characterization of the fiber's optical properties, including mode area and single-mode behavior.
- Analysis of higher-order mode suppression through high loss and power delocalization.
Main Results:
- The fabricated fiber achieved an effective mode area of ~1,000 µm² at 1,060 nm with a 40 µm core diameter.
- Robust single-mode behavior was confirmed through detailed characterizations.
- The design demonstrated high suppression of higher-order modes.
Conclusions:
- The single trench fiber design offers a cost-effective and easily fabricated solution for mode area scaling.
- This design significantly enhances effective single-mode operation, making it suitable for compact fiber laser applications.
- The fiber exhibits superior performance compared to other designs for fiber laser applications.
