We report the first mode-locked, thulium-doped fiber figure-eight laser. The mode-locked oscillator produces 1.5-ps pulses with 63 pJ of pulse energy at a 10.4-MHz repetition rate with a 3-nm bandwidth at a center wavelength of 2034 nm. After amplification, the pulses are compressed to 370 fs with ~50 nJ of pulse energy. The oscillator can also operate in a square pulse regime, yielding stable pulses from ~100 ps to 20 ns long with ~100 nJ per pulse after amplification.
© 2013 IEEE
Charles W. Rudy, Karel E. Urbanek, Michel J. F. Digonnet, and Robert L. Byer, "Amplified 2-μm Thulium-Doped All-Fiber Mode-Locked Figure-Eight Laser," J. Lightwave Technol. 31, 1809-1812 (2013)