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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CJ_1_1

Coherent Combining Techniques to Scale the Performances of Ultrafast Fiber Amplifiers

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Abstract

Ytterbium-doped fiber amplifiers have become a major technology in the high average power laser sources landscape. They combine numerous advantages making them ideally suited for an increasing number of applications, including industrial material processing, medical treatment, and scientific experiments. The double-clad geometry, low quantum defect, and large surface to volume ratio of the fiber lead to unique properties in terms of allowable average power and beam quality. When used to amplify femtosecond pulses, at large peak power levels, the peculiar geometry of fiber amplifiers turns into a disadvantage in terms of pulse energy when compared to other gain medium shapes. The optical mode is strongly confined within the fiber core, and guided over meter-sized lengths, enhancing nonlinear interaction with the fiber material. Moreover, the limited gain bandwidth of ytterbium-doped glass, combined with typical large gain levels, induce gain narrowing and limit the achievable amplified pulsewidth to 300 – 500 fs.

© 2015 IEEE

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