A theoretical model that characterizes the physical process responsible for generating ultrashort, high-energy, mode-locked pulses in a normal-dispersion laser cavity with strong spectral filtering is developed. According to this model, two of the critical physical parameters used to achieve optimal performance are the ratio of the filter bandwidth to the gain bandwidth and the placement of the output coupler in the laser cavity. The spectral filtering plays a crucial role in maintaining a short pulse duration with high energy. This phenomenon is generic to mode locking with normal dispersion.
© 2008 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: February 26, 2008
Manuscript Accepted: March 13, 2008
Published: April 24, 2008
Brandon G. Bale, J. Nathan Kutz, Andy Chong, William H. Renninger, and Frank W. Wise, "Spectral filtering for mode locking in the normal dispersive regime," Opt. Lett. 33, 941-943 (2008)