Abstract
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
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