Nh. Bonadeo et al., Passive harmonic mode-locked soliton fiber laser stabilized by an optically pumped saturable Bragg reflector, OPTICS LETT, 25(19), 2000, pp. 1421-1423
Stabilization of passive harmonic mode locking is achieved for what is beli
eved to be the first time in an Er-Yb soliton fiber laser by optical pumpin
g of the semiconductor saturable absorber above the bandgap. The results sh
ow 35-dB mode suppression of undesired harmonics. (C) 2000 Optical Society
of America.