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In the pulse application, a significantly increased efficiency of high power largemode area fiber amplifiers is demonstrated by improving the overlap of the doped region with the fundamental mode of the fiber.
A fully integrated self-referenced Er-fiber frequency-comb system without the use of highly nonlinear or microstructured fiber is demonstrated. We use a single PPLN-waveguide for both spectral broadening and 2f-to-3f CEO-phase detection.
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