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High average power large-pitch fiber amplifier with robust single-mode operation
Fabian Stutzki1, Florian Jansen, Tino Eidam
1Friedrich-Schiller-University Jena, Institute of Applied Physics, Jena, Germany. fabian.stutzki@uni-jena.de
Optics Letters
|March 4, 2011
Summary
Ytterbium-doped large-pitch fibers achieved 294 W output power in a high-power amplifier. This fiber design significantly enhances the threshold for mode instabilities, enabling robust single-mode operation.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- High-power fiber amplifiers are crucial for various applications.
- Achieving high output power while maintaining single-mode operation is challenging.
- Mode instabilities limit the performance of large mode area fibers.
Purpose of the Study:
- To investigate ytterbium-doped large-pitch fibers in a high-power amplifier.
- To assess the single-mode operation capabilities of these fibers.
- To evaluate the impact on mode instability thresholds.
Main Methods:
- Utilizing ytterbium-doped large-pitch fibers with large mode areas.
- Configuring a high-power fiber amplifier.
- Measuring output power and mode field diameter.
- Analyzing mode instability thresholds.
Main Results:
- Demonstrated an average output power of 294 W.
- Maintained robust single-mode operation with a mode field diameter of 62 μm.
- Increased the threshold of mode instabilities by approximately a factor of 3 compared to previous designs.
Conclusions:
- Ytterbium-doped large-pitch fibers are effective for high-power amplification.
- These fibers offer improved resistance to mode instabilities.
- The results pave the way for more powerful and stable single-mode fiber lasers.
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