Abstract
We report on a passively mode-locked oscillator based on an erbium-doped dual concentric core fiber combining high normal dispersion and large mode area. This large normal dispersion laser generates long pulses with 30 ps duration and 0.17 nm spectral width at 1530 nm wavelength. The source delivers an average power of 64 mW at a repetition rate of 16 MHz, corresponding to 4 nJ energy. This concept opens up new degrees of freedom in the design of mode-locked fiber lasers.
Highlights
Ultrafast lasers based on optical fibers are increasingly exploited in scientific and industrial applications
We reported a passively mode-locked oscillator exploiting an active dual concentric core fibers (DCCF) designed to provide a large normal dispersion around 1530 nm for the first time to our knowledge
We selected a set of opto-geometrical parameters that lead to a tradeoff between normal dispersion, dispersion slope, and effective mode area
Summary
Ultrafast lasers based on optical fibers are increasingly exploited in scientific and industrial applications. Stimulated by several industrial and scientific applications, the performance of ultrashort pulse fiber laser systems has grown phenomenally over the last decade This outstanding growth mainly concerned ytterbium-doped fiber lasers operating at 1 μm. One of the advantages of lasers operating at wavelengths below 1.3 μm is that the dispersion of silica fibers is normal, allowing a better management of nonlinear effects which constitute a fundamental issue in the ultrashort-pulse regime. It is well-established that nonlinear pulse propagation in normal dispersion fibers favors energy scaling.
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