Yb-doped hybrid fiber with anomalous dispersion of 100-380 ps/(nm⋅km) near 1 μm was demonstrated. Single-mode propagation was achieved by selective mode amplification of the hybrid mode: only central part of the core was doped with Yb-ions, which allowed preferences for hybrid mode amplification (suppression of undesirable modes can exceed 20-30 dB, when splice conditions are optimized). Usage of the developed fiber as non-linear pulse compressor allowed us to demonstrate pulses with duration of 250 fs and peak power in excess of 3 kW.
Svetlana S. Aleshkina, Mikhail Yu. Salganskii, Denis S. Lipatov, Andrei K. Senatorov, Mikhail M. Bubnov, Alexei N. Guryanov, and Mikhail E. Likhachev, "Single-mode high-anomalous-dispersion Yb-doped hybrid fiber amplifier," Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108970Z (Presented at SPIE LASE: February 06, 2019; Published: 7 March 2019); https://doi.org/10.1117/12.2507781.
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