Frequency-modulation mode locking of a Nd3+-doped fiber laser operating at 1.09 μm using a bulk phase modulator is reported. The resulting pulses have a 20-psec duration (FWHM) and a peak power of 1 W. A least-squares fit to the second-harmonic-intensity autocorrelation trace and the time–bandwidth product of 0.30 ± 0.04 suggest that the pulses are bandwidth limited with a sech2-type profile.
© 1989 Optical Society of America
Original Manuscript: August 29, 1988
Manuscript Accepted: November 30, 1988
Published: February 15, 1989
M. W. Phillips, A. I. Ferguson, and D. C. Hanna, "Frequency-modulation mode locking of a Nd3+-doped fiber laser," Opt. Lett. 14, 219-221 (1989)