We demonstrate, for the first time to our knowledge, a self-starting passive harmonic mode-locked femtosecond Yb<sup>3+</sup> -doped fiber laser with a scalable repetition rate of up to 585 MHz and >45 dB of supermode suppression. Pulse-to-pulse jitter of ~14 ps is measured by optical cross correlation at the ninth harmonic, and radio-frequency (RF) spectrum measurements show that certain correlations exist between pulses in harmonic mode. Our results suggest that one of the proposed passive harmonic mode-locking mechanisms may be dominant for this laser.
© 2004 Optical Society of America
Yujun Deng and Wayne H. Knox, "Self-starting passive harmonic mode-locked femtosecond Yb3+-doped fiber laser at 1030 nm," Opt. Lett. 29, 2121-2123 (2004)