We report a stable passive second-harmonic mode-locked all-normal-dispersion ytterbium fiber laser based on nonlinear polarization evolution. This fiber laser has two polarization beam splitter output ports for optimizing the output spectrum 5 ps duration pulses with 187 mW average power being generated at the harmonic repetition rate of 99.6 MHz. By use of a pair of gratings to extracavity compensate the chirp, the pulse is further compressed to 220 fs. We measured that the peak-to-pedestal extinction of the radio frequency is about 80 dB corresponding to a pulse-to-pulse energy fluctuation of 0.32% and timing jitter of 3.2 ps.
© 2014 Optical Society of America
Lasers and Laser Optics
Original Manuscript: April 10, 2014
Revised Manuscript: July 6, 2014
Manuscript Accepted: July 9, 2014
Published: August 4, 2014
Junli Wang, Xiangbao Bu, Rui Wang, Long Zhang, Jiangfeng Zhu, Hao Teng, Hainian Han, and Zhiyi Wei, "All-normal-dispersion passive harmonic mode-locking 220 fs ytterbium fiber laser," Appl. Opt. 53, 5088-5091 (2014)