High-power narrow-linewidth large mode area photonic bandgap fiber amplifier

Benjamin Pulford; Iyad Dajani; Thomas Ehrenreich; Roger Holten; Christopher Vergien; Nader Naderi; Cody Mart; Guancheng Gu; Fanting Kong; Thomas Hawkins; Liang Dong

doi:10.1117/12.2082709

4 March 2015 High-power narrow-linewidth large mode area photonic bandgap fiber amplifier

Benjamin Pulford, Iyad Dajani, Thomas Ehrenreich, Roger Holten, Christopher Vergien, Nader Naderi, Cody Mart, Guancheng Gu, Fanting Kong, Thomas Hawkins, Liang Dong

Author Affiliations +

Proceedings Volume 9344, Fiber Lasers XII: Technology, Systems, and Applications; 934406 (2015) https://doi.org/10.1117/12.2082709
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

Ytterbium-doped large mode area all-solid photonic bandgap fiber amplifiers were used to demonstrate <400 W of output power at 1064 nm. In an initial set of experiments, a fiber with a core diameter of ~50 μm, and a calculated effective area of 1450 μm² in a straight fiber, was used to generate approximately 600 W. In this case, the input seed was modulated using a sinusoidal format at a frequency of 400 MHz. The output, however, was multimode as the fiber design did not allow for single-mode operation at this wavelength. A second fiber was then fabricated to operate predominantly in single mode at 1064 nm by having the seed closer to the short wavelength edge of the bandgap. This fiber was used to demonstrate 400 W of single-frequency output with excellent beam quality. As the signal power exceeded 450 W, there was significant degradation in the beam quality due to the modal instability. Nevertheless, to the best of our knowledge, the power scaling results obtained in this work far exceed results from prior state of the art all-solid photonic bandgap fiber lasers.

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Benjamin Pulford, Iyad Dajani, Thomas Ehrenreich, Roger Holten, Christopher Vergien, Nader Naderi, Cody Mart, Guancheng Gu, Fanting Kong, Thomas Hawkins, and Liang Dong "High-power narrow-linewidth large mode area photonic bandgap fiber amplifier", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 934406 (4 March 2015); https://doi.org/10.1117/12.2082709

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