Abstract

We demonstrate a compact, all-fiber-integrated laser system that delivers Raman solitons with a duration of $\sim 100\mathrm{fs}$ and pulse energy of up to 13.3 nJ, continuously wavelength tunable from 1.98 to 2.29 µm via Raman-induced soliton self-frequency shift (SSFS) in a thulium-doped fiber amplifier. We realize a $>90\%$ efficiency of Raman conversion, the highest reported value from SSFS-based sources, to the best of our knowledge. This enables us to achieve $>10\mathrm{nJ}$ soliton energy from a 2.16 to 2.29 µm range, the highest energy demonstrated above 2.22 µm from an SSFS-assisted, all-fiber tunable single-soliton-pulse source, to the best of our knowledge. Our simple and compact all-fiber tunable laser could serve as an efficient $\sim 2\mathrm{\mu m}$ femtosecond source for a wide range of mid-infrared applications.

© 2017 Optical Society of America

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