The self-frequency shift effect has been examined in a harmonically mode-locked ring laser. With the insertion of a filter inside the cavity, we observed that this effect can be greatly suppressed and the range of gain for stable operation can be wider.
An actively harmonic mode locked fiber ring laser was setup, stability under the nearby of harmonic modulation frequency was analyzed. A new cavity length feedback system was implemented to realize the long-term stability. A chaos phenomena in the actively harmonic mode locked fiber ring laser was observed.
We have studied theoretically the formation of short pulses inside an actively mode-locked ring laser by studying the effect of pump power, amplification parameter and modulator characteristics. Moreover, multi-soliton formation has been examined.
10 GHz repetition rate soliton-like pulses with duration of 29.85 ps have been obtained in an actively mode-locked fiber ring laser. 20 GHz rational harmonic mode-locked soliton-like pulses were also observed. A piezoelectric transducer driven cavity length feedback system was employed to realize the long-term stability of the laser source.
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