Abstract

Femtosecond pulses with broad tunability in the range of 2–3 μm are generated in a germanate-glass core silica-glass cladding fiber with a driving pulse at 2 μm produced by an all-fiber laser system consisting of an Er:fiber source at 1.6 μm, a Raman fiber shifter, and a Tm:fiber amplifier. We demonstrate optical pulses with a duration of the order of 100 fs that are the shortest ones reported in the 2.5–3 μm range obtained by fiber laser systems.

© 2014 Optical Society of America

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