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Updated: Jul 4, 2026
09:39
In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
Published on: May 27, 2013
Double clad tapered fiber for high power applications
V Filippov1, Yu Chamorovskii, J Kerttula
1Optoelectronics Research Centre, Tampere University of Technology, 33101 Tampere, Finland. valery.filippov@tut.fi
Optics Express
|June 11, 2008
Summary
We developed a novel tapered double clad fiber for efficient laser applications. This active fiber, suitable for low-brightness sources, achieves high output power and excellent beam quality.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Double clad fibers are essential for high-power fiber lasers.
- Pumping high-power fiber lasers typically requires high brightness sources.
Purpose of the Study:
- To report a novel tapered double clad fiber.
- To demonstrate its suitability for low brightness sources.
- To achieve high-power laser output with excellent beam quality.
Main Methods:
- Fabrication of Ytterbium double clad all-silica fiber using plasma chemical technologies.
- Tapering the fiber by a factor of 4.8 over a length of 10.5 m.
- Characterization of pump absorption, lasing slope efficiency, and beam quality.
Main Results:
- Demonstrated 0.9 dB/m pump absorption at 976 nm.
- Achieved 84 W output power with 92% slope efficiency in a fiber laser.
- Realized a 74 W superfluorescent source with 85% slope efficiency.
- Obtained robust single-mode operation with M(2)=1.07.
Conclusions:
- The novel tapered double clad fiber is effective for pumping by low brightness sources.
- This fiber enables high-power, single-mode laser operation with excellent efficiency.
- The developed fiber is suitable for various laser applications, including CW and pulsed regimes.
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