PROCEEDINGS ARTICLE | February 23, 2006
Proc. SPIE. 6102, Fiber Lasers III: Technology, Systems, and Applications
KEYWORDS: Polarization, Dispersion, Mode locking, Solitons, Fiber lasers, Picosecond phenomena, Femtosecond fiber lasers, Oscilloscopes, Optical isolators, Pulsed laser operation
We report passive harmonic mode locking of a high-power Yb-doped double-clad fiber laser operating in both the normal- and the anomalous-dispersion regimes with a fundamental repetition rate of 20.4 MHz. In the anomalous-dispersion regime (total cavity GVD of -0.1 ps2), 1-ps, 125-pJ pulses are emitted at a repetition rate of 408 MHz. When the total net dispersion is close to zero (about -0.004 ps2), 680 fs, 48 pJ pulses are emitted at a repetition rate higher than 2 GHz. The supermodes suppression is than about 25 dB. In the normal-dispersion regime (total cavity GVD of +0.047 ps2), 116-fs, 1.7-nJ pulses are emitted at a repetition rate of 102 MHz with a supermodes suppression of more than 60 dB. We also report a new regime of multiple pulsing emission observed with this fiber laser : the stable emission of two pairs of bound pulses exhibiting different time separations and uniformly separated in the same cavity round trip.
Keywords: Harmonic mode locking, multiple pulsing, bound states.
