Pulse generation with an arbitrary numerator is experimentally demonstrated in seventh- and ninth-order rational-harmonic mode-locked fiber lasers. Conventionally, the numerator of rational-harmonic mode locking is equal to 1. Furthermore, the experimental generation of the numerator m=5, 22nd-order rational-harmonic mode-locked pulse confirms that the amplitude distributions in such pulse trains are strongly modulated by the numerator m=1 lower-order rational-harmonic mode locking. The result is important, as it indicates that a higher-repetition-rate pulse train can be obtained by an arbitrary numerator rational-harmonic mode-locking technique.
© 2004 Optical Society of America
Pinghe Wang, Li Zhan, Zhaochang Gu, Qinghao Ye, Xiao Hu, and Yuxing Xia, "Arbitrary numerator rational-harmonic mode locking in fiber ring lasers," J. Opt. Soc. Am. B 21, 1781-1783 (2004)