A passive harmonically mode-locked fiber laser cladding pumped by a broad-area diode-laser array is described. Harmonic mode locking is obtained in a frequency range from 33.3 to 128.6 MHz, where the higher frequency limit is imposed because of insufficient available pump power. The maximum pulse jitter in one cavity round-trip time is between 300 and 50 ps in the whole frequency range, and the sidebands in the frequency domain are suppressed by as much as 50 dB. 600-fs bandwidth-limited pulses with pulse energies of as much as 20 pJ are obtained, giving rise to an average output power as great as 2.5 mW.
© 1996 Optical Society of America
Original Manuscript: January 2, 1996
Published: July 1, 1996
M. E. Fermann and J. D. Minelly, "Cladding-pumped passive harmonically mode-locked fiber laser," Opt. Lett. 21, 970-972 (1996)